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<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/"> <channel> <title>Reprap Forum - Paste Extrusion Working Group</title> <description>(Contents under pressure) -> http://objects.reprap.org/wiki/Paste_Extrusion </description> <link>https://reprap.org/forum/list.php?180</link> <lastBuildDate>Sat, 11 May 2024 15:03:30 -0400</lastBuildDate> <generator>Phorum 5.2.23</generator> <item> <guid>https://reprap.org/forum/read.php?180,512277,825087#msg-825087</guid> <title>Re: Calculating motor torque required to operate a syringe type paste exrtruder</title> <link>https://reprap.org/forum/read.php?180,512277,825087#msg-825087</link> <description><![CDATA[ Do you know how much pressure you need? If so then the torque needed to produce that pressure is easy enough to calculate:<br /><br />Work_per_turn = plunger_area * leadscrew_lead * pressure = motor_torque * 2 * pi * leadscrew_efficiency<br /><br />Solve for torque or for pressure.]]></description> <dc:creator>dc42</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Sun, 10 Jun 2018 02:27:58 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,512277,825067#msg-825067</guid> <title>Re: Calculating motor torque required to operate a syringe type paste exrtruder</title> <link>https://reprap.org/forum/read.php?180,512277,825067#msg-825067</link> <description><![CDATA[ I did not know how to calculate it either, but after breaking one tube I had to learn it: [<a href="http://fightpc.blogspot.com/2018/06/too-much-pressure.html" target="_blank" rel="nofollow">fightpc.blogspot.com</a>]<br /><br />Just for other readers looking for answers (but most likely too late for the OP :-).]]></description> <dc:creator>misan</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Sat, 09 Jun 2018 16:00:31 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,820435,820435#msg-820435</guid> <title>Paste extruder</title> <link>https://reprap.org/forum/read.php?180,820435,820435#msg-820435</link> <description><![CDATA[ Hi,<br /><br /> I've made a paste extruder(plunger type), in which a plunger will push the syringe to extrude. Plunger movement is controlled by a stepper motor. In that arrangement, for g-code generation I've used inside dia of syringe as the filament diameter and inside dia of needle as nozzle diameter and to calculate extruder steps per mm, I"ve used the lead of threaded rod which controls the movement of plunger. <br /><br />But it had several issues like air bubbles and unable to print thick pastes.<br /><br />Later I've seen this video on <a href="https://www.youtube.com/watch?v=PeYb3snGrU8" target="_blank" rel="nofollow">youtube</a>. In which he later changed to a Auger bit mechanism and I've seen <a href="https://www.personalfab.it/en/shop/clay-extruder-kit-2-0/" target="_blank" rel="nofollow">WASP LDM</a>. already made a successful one.<br /><br />I'm trying to make one of these. But in this mechanism how to calculate the steps per mm for Extruder?<br /><br />Is it same as the lead of Auger bit??<br />What about the filament diameter in slic3r settings??<br />Anyone have any idea??<br /><br />Thanks]]></description> <dc:creator>athul</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Sat, 28 Apr 2018 03:37:40 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,757498,817315#msg-817315</guid> <title>Re: "Serious" Paste-dispensing ;)</title> <link>https://reprap.org/forum/read.php?180,757498,817315#msg-817315</link> <description><![CDATA[ Thanks for your input and keeping us updated about more industrial equipment. Hard to find non-corporate infos on those..<br /><br />Do you know what is used in your piezo dispenser? What piezo and what mechanical amplifier?<br />No chance a light, more crude version could be somewhat affordable?<br /><br />What solenoid valve does your pneumatic piston use?]]></description> <dc:creator>heinz</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Wed, 04 Apr 2018 15:47:00 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,757498,817302#msg-817302</guid> <title>Re: "Serious" Paste-dispensing ;)</title> <link>https://reprap.org/forum/read.php?180,757498,817302#msg-817302</link> <description><![CDATA[ ... the thin-sheet actors are not "strong" enough to push the fluid directly ... but could be redesigned for different behaviour.<br /><br />The "clamped" bimorph stacks are known as "torque-drive"-actuators - I have a tweezer with this type of PZT-actuator, which can open/close the tweezer with 300µm moving range and frequenzies of some Kilohertz ... but not cheap enough for DIY neither :(<br /><br />Actually I have another "pulsing" paste-dispenser for testing, where the piston is moved per pneumatic -- some hundred Hertz, end customer price maybe around 1000 €uros ...]]></description> <dc:creator>VDX</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Wed, 04 Apr 2018 14:11:25 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,757498,817286#msg-817286</guid> <title>Re: "Serious" Paste-dispensing ;)</title> <link>https://reprap.org/forum/read.php?180,757498,817286#msg-817286</link> <description><![CDATA[ Hi Viktor,<br />I was reading your other posts about your piezo dispenser.<br /><br />Do you think some form of DIY version is feasible?<br /><br />This simple bimorph piezo actuator costs 20$:<br />[<a href="https://www.steminc.com/PZT/en/piezo-ceramic-bimorph-40x10x05mm-2-khz" target="_blank" rel="nofollow">www.steminc.com</a>]<br />Here in action:<br />[<a href="https://www.youtube.com/watch?v=w79wTb2zOQQ" target="_blank" rel="nofollow">www.youtube.com</a>]<br /><br />Here is another one with an amplified motion mechanism:<br />[<a href="https://www.youtube.com/watch?time_continue=14&v=rN3oWzDwGeQ" target="_blank" rel="nofollow">www.youtube.com</a>]]]></description> <dc:creator>heinz</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Wed, 04 Apr 2018 12:04:59 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,777906,777934#msg-777934</guid> <title>Re: Help with Paste extruder!</title> <link>https://reprap.org/forum/read.php?180,777906,777934#msg-777934</link> <description><![CDATA[ ... you'll need more torque - so stronger/bigger motor or gearing.<br /><br />Another point with higher viscosity pastes is the gap between nozzle and surface - you can block the flow, if there's not enough room to escape ...]]></description> <dc:creator>VDX</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Thu, 13 Jul 2017 13:40:32 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,777906,777906#msg-777906</guid> <title>Help with Paste extruder!</title> <link>https://reprap.org/forum/read.php?180,777906,777906#msg-777906</link> <description><![CDATA[ Hi all,<br /><br />I am building a paste extruder based on open source design. However I am having some issues with the stepper motor (NEMA17 Stepper Motors (62 oz) - Model: 1.8° - 1703HS168A ). Video link <a href="https://youtu.be/iyhBfU0DxWo" target="_blank" rel="nofollow"> see the video </a>: It appears that the motor is slipping (skipping?) at the coupler while trying to push the material through.<br /><br />Specs: ACME 8 mm thread >>8mm-5mm coupler>> 5 mm motor shaft<br /><br />I have increased the amps upto 900 mA from whatever the default was in Prusa i3 Mk2. I also set the extruder steps to M92 E 70 (steps/mm).<br /><br />As you can see i am using a 50 ml syringe with about 25-30 cm tubing (internal diameter 4 mm).<br /><br />Any Ideas what i can do to sort it? I am planning to increase the stepper current further and hopefully results in greater torque to push the material through. <br /><br />Any help/suggestions are deeply appreciated!]]></description> <dc:creator>mm13360</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Thu, 13 Jul 2017 10:20:27 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,757498,773757#msg-773757</guid> <title>Re: "Serious" Paste-dispensing ;)</title> <link>https://reprap.org/forum/read.php?180,757498,773757#msg-773757</link> <description><![CDATA[ ... did some tests for the next exhibition - this will run in background and eventually create some give-aways ;)<br /><br />"CNC-Simply Paste-jetting +UV-curing"<br /><br />[<a href="https://vimeo.com/222033452" target="_blank" rel="nofollow">vimeo.com</a>]<br /><br />[<a href="https://vimeo.com/222032509" target="_blank" rel="nofollow">vimeo.com</a>]<br /><br />[<a href="https://vimeo.com/222032866" target="_blank" rel="nofollow">vimeo.com</a>]<br /><br /><br />[attachment 95366 Tri_1.jpg]<br /><br />[attachment 95367 Tri_2.jpg]]]></description> <dc:creator>VDX</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Sat, 17 Jun 2017 18:34:57 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,757498,762410#msg-762410</guid> <title>Re: "Serious" Paste-dispensing ;)</title> <link>https://reprap.org/forum/read.php?180,757498,762410#msg-762410</link> <description><![CDATA[ ... it's a cartesian style machine, "armed" with a piezo-driven nozzle from Vermes, normally used for glue or solder paste dispensing ... the nozzle is roughly 3x more expensive, than the machine 8-)<br /><br />Here a video or first testing, showing the complete setup - [<a href="https://vimeo.com/142372882" target="_blank" rel="nofollow">vimeo.com</a>]<br /><br />... another test, a bit of the software too - [<a href="https://vimeo.com/160084331" target="_blank" rel="nofollow">vimeo.com</a>]<br /><br />... and trying the speed limits -[<a href="https://vimeo.com/192913920" target="_blank" rel="nofollow">vimeo.com</a>]]]></description> <dc:creator>VDX</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Fri, 14 Apr 2017 18:48:33 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,757498,762400#msg-762400</guid> <title>Re: "Serious" Paste-dispensing ;)</title> <link>https://reprap.org/forum/read.php?180,757498,762400#msg-762400</link> <description><![CDATA[ Care to share our set up?]]></description> <dc:creator>The3rdIcon</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Fri, 14 Apr 2017 18:01:41 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,757498,757498#msg-757498</guid> <title>"Serious" Paste-dispensing ;)</title> <link>https://reprap.org/forum/read.php?180,757498,757498#msg-757498</link> <description><![CDATA[ ... maybe a bit extreme, but this too is "paste-dinspensing":<br /><br />[attachment 92242 3D-Paste6.jpg]]]></description> <dc:creator>VDX</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Tue, 21 Mar 2017 19:21:24 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,733384,754585#msg-754585</guid> <title>Re: Auger extruder where?</title> <link>https://reprap.org/forum/read.php?180,733384,754585#msg-754585</link> <description><![CDATA[ [<a href="http://www.alfadex.com/2015/03/filament-extruder/" target="_blank" rel="nofollow">www.alfadex.com</a>]<br /><br />i bought mine from ebay]]></description> <dc:creator>alfadex</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Thu, 09 Mar 2017 13:37:08 -0500</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,746550,746550#msg-746550</guid> <title>Slurry doser for layer printing in planar chromatography</title> <link>https://reprap.org/forum/read.php?180,746550,746550#msg-746550</link> <description><![CDATA[ Hello,<br />I would like to present one of my project:<br />I re-purpose a 3D printer to print silica gel layer for planar chromatography.<br /><br />Chromatography in two sentences is a technique allowing separation of molecules based on their interactions with a stationary phase (here silica gel) and a mobile phase (here toluene). The mobile phase flow through the stationary phase and the molecules that have more affinity with the stationary phase will flow slower than the molecules that have more affinity with the mobile phase, allowing separation.<br /><br />Here is the abstract of <a href="http://pubs.acs.org/doi/abs/10.1021/acs.analchem.6b04813" target="_blank" rel="nofollow">the paper</a> we published on the subject, PM me if you want the pdf as I don't think I can put it here:<br />On the basis of open-source packages, 3D printing of thin silica gel layers is demonstrated as proof-of-principle for use in planar chromatography. A slurry doser was designed to replace the plastic extruder of an open-source Prusa i3 printer. The optimal parameters for 3D printing of layers were studied, and the planar chromatographic separations on these printed layers were successfully demonstrated with a mixture of dyes. The layer printing process was fast. For printing a 0.2 mm layer on a 10 cm × 10 cm format, it took less than 5 min. It was affordable, i.e., the running costs for producing such a plate were less than 0.25 Euro and the investment costs for the modified hardware were 630 Euro. This approach demonstrated not only the potential of the 3D printing environment in planar chromatography but also opened new avenues and new perspectives for tailor-made plates, not only with regard to layer materials and their combinations (gradient plates) but also with regard to different layer shapes and patterns. As such an example, separations on a printed plane layer were compared with those obtained from a printed channeled layer. For the latter, 40 channels were printed in parallel on a 10 cm × 10 cm format for the separation of 40 samples. For producing such a channeled plate, the running costs were below 0.04 Euro and the printing process took only 2 min. All modifications of the device and software were released open-source to encourage reuse and improvements and to stimulate the users to contribute to this technology. By this proof-of-principle, another asset was demonstrated to be integrated into the Office Chromatography concept, in which all relevant steps for online miniaturized planar chromatography are performed by a single device.<br /><br />For the moment, we are only printing one layer so 3D printing is a bit exaggerated, however, the auto bed levelling feature was primordial to assure an homogeneous level. Our objective is layers in the sub 50µm range.<br />The slurry mixture consist of 0.88 g of silica gel (particle size 5-25 µm), 0.12 g of CaSO4 and 3 g of water. Keeping the slurry under magnetic agitation before use is enough to avoid sedimentation. I must explore other recipes and especially the use of polymer binder.<br />I also create a software in R for GCODE creation and sending to the arduino. It was necessary to give options that make sense for a chemist, like amount of slurry per path which is set indirectly otherwise (At first, I started with OpenSCAD + Slic3r + Pronterface).<br />In fine, our objective is to make a small machine able to do other steps of the analytical pipeline for planar chromatography. The concept for such machine is named Office Chromatography, it was <a href="http://dx.doi.org/10.1016/j.chroma.2014.09.050" target="_blank" rel="nofollow">introduce in 2010</a> by my professor but didn't exist so far. <br /><br />Here is a few pictures:<br />Slurry doser mounted on the prusa i3[attachment 90178 FigureS-3.JPG]<br />hello world[attachment 90177 Hello_world_1_R.jpg]<br />plate with plane layer before sample application and elution[attachment 90176 plate_69.jpg]<br />same plate after separation[attachment 90175 plate_69_developed_RT.jpg]<br />plate with channelled layers after separation[attachment 90174 plate_85_developed_RT.jpg]<br /><br />The <a href="https://github.com/DimitriF/Slurry-doser" target="_blank" rel="nofollow">github repo</a>: design and marlin firmware<br /><br />Dimitri]]></description> <dc:creator>DimitriF</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Wed, 08 Feb 2017 07:25:08 -0500</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,733384,733384#msg-733384</guid> <title>Auger extruder where?</title> <link>https://reprap.org/forum/read.php?180,733384,733384#msg-733384</link> <description><![CDATA[ Hey everybody :) <br />Im looking to build an paste extruder for other material than PLA as I'm used to. <br /><br />I was looking for an Auger extruder screw, but I can't find one for the application. Where is a good place to source for a good auger extruder screw for a paste extruder? <br /><br />Also what is the best paste extruder design you've seen, if you could link for inspiration. <br /><br />Thank you]]></description> <dc:creator>dynamitetalks</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Tue, 27 Dec 2016 20:33:37 -0500</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,719818,719818#msg-719818</guid> <title>Pasta extrusion</title> <link>https://reprap.org/forum/read.php?180,719818,719818#msg-719818</link> <description><![CDATA[ Hi,<br /><br />I recently got a request to print pasta so I looked a bit around but except for Barilla (https://www.youtube.com/watch?v=oz6D1FXwuvA) I didnt find any reprapers doing that. Im not so much worried about the paste extrusion, more about the the dough and the over all cost and time involved. Has anyone here ever tried their hands at pasta?<br /><br />Cheers]]></description> <dc:creator>sungod3k</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Sat, 05 Nov 2016 03:14:34 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,18770,663401#msg-663401</guid> <title>Re: Simple Dispenser</title> <link>https://reprap.org/forum/read.php?180,18770,663401#msg-663401</link> <description><![CDATA[ ... what files? - the CNC-program was made with IsyCAD, so only usefull for Isel-controlleres ... and only, if you have the right motor.<br /><br />It's easier to design it from scratch with individual numbers, than modify the CNC files.<br /><br />Here the actualized link to the WiKi-page, as the old seems to be broken - [<a href="http://reprap.org/wiki/VDX_Paste_Dispenser" target="_blank" rel="nofollow">reprap.org</a>]]]></description> <dc:creator>VDX</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Fri, 13 May 2016 06:21:43 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,18770,663379#msg-663379</guid> <title>Re: Simple Dispenser</title> <link>https://reprap.org/forum/read.php?180,18770,663379#msg-663379</link> <description><![CDATA[ Awesome! Please share the files so that others may try it!]]></description> <dc:creator>ashishraj</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Fri, 13 May 2016 05:39:02 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,363747,659477#msg-659477</guid> <title>Re: Chocolate Extruder (:D</title> <link>https://reprap.org/forum/read.php?180,363747,659477#msg-659477</link> <description><![CDATA[ This discussion is so sparse ... did you came up with another design ?]]></description> <dc:creator>Gibbon91</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Mon, 02 May 2016 15:03:13 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,643247,649014#msg-649014</guid> <title>Re: High Resolution Paste Extruder Help</title> <link>https://reprap.org/forum/read.php?180,643247,649014#msg-649014</link> <description><![CDATA[ Hello milner,<br /><br />we have this machine at work:<br />[<a href="http://vormvrij.nl/shop.php#!/LUTUM%C2%AE-clay-3dprinter/p/63853187/category=13496106" target="_blank" rel="nofollow">vormvrij.nl</a>]<br />The resolution in xy is generally possible with reprap style machines.The smallest nozzle of the LUTUM printer is 0.6mm, but you can define your gaps in the CAD file or slicer. If you need finer nozzles, there is a german paste dispensing specialist currently advertising an addon for reprap style machines to extrude even smaller lines [<a href="http://www.viscotec.de/branchenanwendungen/3d-druck" target="_blank" rel="nofollow">www.viscotec.de</a>]. Depending on the viscosity of your material, you have to be aware, that paste extrusion is generally more tricky than FDM. The viscosity can limit the smallest lines to be extruded. <br />Generally, I see no problem in what you want to do. But it would help, if you specify what material you want to print with and what your budget is.<br />Best regards,<br />krosstoph]]></description> <dc:creator>krosstoph</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Wed, 06 Apr 2016 09:13:05 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,643247,643247#msg-643247</guid> <title>High Resolution Paste Extruder Help</title> <link>https://reprap.org/forum/read.php?180,643247,643247#msg-643247</link> <description><![CDATA[ Hello All,<br /><br />I am new to 3D printing, and am wondering about high resolution with a paste extruder. I would like to print with 100um (100 microns, or 0.1mm) resolution in the x and y axes. The needle extruding the paste does not need to be 100um thin (I would like it to be thicker), but I want to be able to have gaps between x-y layers of paste that are 100um. Basically, it would print something like a maze, with walls made of paste and pathways of 100um in width. Are there any motors that are capable of such fine movement and accuracy? Would calibration be an issue? Thank you in advance, and apologies for my lack of 3D printer terminology/experience!]]></description> <dc:creator>milner</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Wed, 23 Mar 2016 01:01:25 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,363747,615988#msg-615988</guid> <title>Re: Chocolate Extruder (:D</title> <link>https://reprap.org/forum/read.php?180,363747,615988#msg-615988</link> <description><![CDATA[ <blockquote class="bbcode"><div><small>Quote<br /></small><strong>Aakysank</strong><br />Nice design ! Very Simple easy to understand design.! :) <br />Well why not chocolate available as filament like PLA and ABS.?</div></blockquote><br />My English is not so good, i speak german, so i dont know if you really understood the working principle.<br /><br />You do NOT need filament shaped Chocolate. You just throw chocolate pieces into the funnel, it will melt, and the gear-pump will do the dosing.<br /><br />Imagine, you dont need a heavy syringe, just a refill station on the side of the printer. When the funnel is empty, the print head drives to the refill station, then back to work. You could also make it bowden style if the pump design is sealing good enough inside, to reach high pressures.<br /><br /><br /><br />The prototype manufacturing is too expensive, so i couldnt do anything new. Therefore i made a kickstarter project:<br /><br /><a href="https://www.kickstarter.com/projects/592599193/schokostruder-chocolate-and-liquid-extruder-for-3d" target="_blank" rel="nofollow">https://www.kickstarter.com/projects/592599193/schokostruder-chocolate-and-liquid-extruder-for-3d</a><br /><br /><br />Goal is to improve and publish the design, so everyone can use it. I´m sure a few companies will produce it very cheap in masses, for 50 bucks or below on ebay.<br />Its just a few pieces plastic or stainless, only requirement is a accurate cnc-lathe with driven tools, and at best a bar loader to reduce working time and blend.<br /><br />I hope the Funding will be a success, then you will soon see me printing myself in life-size chocolate (:P)<br /><br />Best wishes, Nick]]></description> <dc:creator>Kolbi</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Tue, 26 Jan 2016 12:19:14 -0500</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,544922,546526#msg-546526</guid> <title>Re: Gear pump or pneumatic valve</title> <link>https://reprap.org/forum/read.php?180,544922,546526#msg-546526</link> <description><![CDATA[ Hi<br /><br />Did you have a look at this site [<a href="http://ru.aliexpress.com/wholesale?catId=0&initiative_id=SB_20150817024453&isPremium=y&SearchText=micro+gear+drive+pump" target="_blank" rel="nofollow">ru.aliexpress.com</a>]<br /><br />i am not sure what you are looking for but maybe any of these will work for you?<br /><br /><br />[<a href="http://ru.aliexpress.com/item/MG200XK-DC24W-DC-PUMP-Magnetic-Drive-Micro-Gear-Pump-DC-brushless-motor-outside-controller/32256460232.html" target="_blank" rel="nofollow">ru.aliexpress.com</a>]<br /><br />[<a href="http://ru.aliexpress.com/item/Free-shipping-24V-Brushless-DC-Submersible-Pump-Low-noise-Low-power-Fit-for-Fit-for-Garden/700539579.html" target="_blank" rel="nofollow">ru.aliexpress.com</a>]<br /><br />[<a href="http://ru.aliexpress.com/item/free-shipping-hydraulic-Gear-Pump-CBN-314-with-spline-shaft-and-right-rotate-for-Chinese-tractors/1796355990.html" target="_blank" rel="nofollow">ru.aliexpress.com</a>]<br /><br />I am also interested in printing viscous material with RepRap acrylic adhessive 8000 mPas or less.<br /><br />Ideally with 2 syringes or printheads, to aloow printing of 2 different materials.<br /><br />Please let me know if anybody has an addon to RepRap that I could order.<br /><br />Many thanks.<br />Best regards,<br />Taisiya]]></description> <dc:creator>Taisiya</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Mon, 17 Aug 2015 06:55:15 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,544922,545199#msg-545199</guid> <title>Re: Gear pump or pneumatic valve</title> <link>https://reprap.org/forum/read.php?180,544922,545199#msg-545199</link> <description><![CDATA[ ... search for "micro gear drive pumps" ...<br /><br />[<a href="http://micropump.ca/micropump_GN_series.htm" target="_blank" rel="nofollow">micropump.ca</a>]]]></description> <dc:creator>VDX</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Thu, 13 Aug 2015 03:23:36 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,544922,545142#msg-545142</guid> <title>Re: Gear pump or pneumatic valve</title> <link>https://reprap.org/forum/read.php?180,544922,545142#msg-545142</link> <description><![CDATA[ Dear Viktor,<br /><br />Your solution seems to be of a high precision.<br /><br />Do you know any place where I could get the gear pumps? (preferabely from china) What are they usualy used for (which field)? most of the gear pumps that I found are hydraulic pumps used with internal combustion engines for pumping the lubricants or so, but are designed for continuous operation and high pressures, I doubt they could be used for precise dosing purposes, could they?<br /><br />Concerning the pneumatic valves, I didnt think about the viscosity variations, maybe a little calibration before each use will not be a big problem.]]></description> <dc:creator>mindoverflow</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Wed, 12 Aug 2015 20:50:19 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,544922,544964#msg-544964</guid> <title>Re: Gear pump or pneumatic valve</title> <link>https://reprap.org/forum/read.php?180,544922,544964#msg-544964</link> <description><![CDATA[ ... gear pumps are much more precise than pneumatic valves - the biggest problem with valves is the changing viscosity of the medium with temperature changes or drying/settling over time.<br /><br />I'm actually developing a paste-dispenser around a piezo-driven 'plunger' from Vermes ( [<a href="http://www.vermes.com/en/" target="_blank" rel="nofollow">www.vermes.com</a>] ) -- this is a high precise, but pretty expensive solution 8-)]]></description> <dc:creator>VDX</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Wed, 12 Aug 2015 11:14:15 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,544922,544922#msg-544922</guid> <title>Gear pump or pneumatic valve</title> <link>https://reprap.org/forum/read.php?180,544922,544922#msg-544922</link> <description><![CDATA[ Hello,<br /><br />I'm interested in extruding two component resins, then I'm thinking about dosing gear pumps (annular gear pump) or pneumatic valves. Then I would appreciate your opinion about those, or is there a better alternative? I want to avoid the syringe system to get rid of the refilling issues (air). <br /><br />I'm attaching photos of the pump and valve.<br /><br />I can't find the pumps online, well, i found a supplier but it was intended to be used in the plastic industry at melting temperatures and high pressures (80 bars) and it costed about 1000$ per pump. In my application the resin is at room temperature and the pressure is probably less than 1 bar.<br /><br />The used viscosity is usualy 10000-14000 cps, but lets assume a range of 300-50000 cps. Also the flow rate is about a 100ml / minute and I'm targeting a precision control of about 0.007ml. Then do you have any suggestion or any advice?<br /><br />Thank you,<br />S. Kheireddine]]></description> <dc:creator>mindoverflow</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Wed, 12 Aug 2015 09:04:14 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,540868,540868#msg-540868</guid> <title>Discov3ry Paste extruder with Reprap ?</title> <link>https://reprap.org/forum/read.php?180,540868,540868#msg-540868</link> <description><![CDATA[ Hello <br /><br />I am just wandering if anybody has tried the Discov3ry Paste extruder with Reprap printer?<br /><br />[<a href="http://www.structur3d.io/" target="_blank" rel="nofollow">www.structur3d.io</a>]<br /><br />I am thinking of ordering one but would like to hear any reviews.<br /><br />Or maybe you could recommend me better alternatives for reprap to print with acrylyc adhessive 6000mpas.<br /><br />Many thanks.<br />Best regards,<br />Taisiya]]></description> <dc:creator>Taisiya</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Sun, 02 Aug 2015 10:33:03 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,530001,530454#msg-530454</guid> <title>Re: Silicone printing & spraying on 4 axis printer</title> <link>https://reprap.org/forum/read.php?180,530001,530454#msg-530454</link> <description><![CDATA[ ... sounds like fun :D]]></description> <dc:creator>VDX</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Wed, 08 Jul 2015 15:57:43 -0400</pubDate> </item> <item> <guid>https://reprap.org/forum/read.php?180,530001,530360#msg-530360</guid> <title>Re: Silicone printing & spraying on 4 axis printer</title> <link>https://reprap.org/forum/read.php?180,530001,530360#msg-530360</link> <description><![CDATA[ Most certainly sandwiching different shore hardnesses would work. It's slightly tricky to spray on top of an inflated balloon, as it tends to distort the substrate (due to the material exiting the nozzle at ~40psi)...which would leave the quite uneven layers...but with slumping, and the right movement during cure time, one could get really interesting shapes with fascinating properties!]]></description> <dc:creator>Cowfingers</dc:creator> <category>Paste Extrusion Working Group</category> <pubDate>Wed, 08 Jul 2015 11:47:02 -0400</pubDate> </item> </channel></rss> If you would like to create a banner that links to this page (i.e. this validation result), do the following:
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