Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Geared Peristaltic Quick-Fit Pump Extruder

by RichRap, published

Geared Peristaltic Quick-Fit Pump Extruder by RichRap Aug 3, 2012
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This is a Geared Peristaltic pump, designed for 3D printers to enable them to extrude various materials for building objects.

It's a work in progress, updates will follow, but the basic principle is up-and-running.

This Pump is designed to fit my Quick-Fit X Carriage - http://www.thingiverse.com/thing:19590

6-Jan-2013 - Uploaded Sketchup files


Take a look at my Blog for more details about the Pump and assembly.


The Tube is a critical part, it will either work or fail if you don't have the correct type and size of tube.

It needs a normal NEMA17 motor and 624 Bearings for the pressure pump element.

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how much l/m can it push, and how much head does it generate?

Here's a way to cut down on the pulsations: http://www.coleparmer.com.cn/en/techinfo/techinfo.asp?openlist=D,E,C,A,A1,A3,B,D1,D5,D6,D7&htmlfile=ppumpsreduc_WP.htm&Title=Reducing+Pulsation+in+Peristaltic+Pumping+Systemshttp://www.coleparmer.com.cn/e...
I think you could use a single rotor and use a shaped outer race to vary the occulsion of the pair of tubes. May have to build one and try it....

Thanks, I hope to be doing some more testing with this soon

hmm, you should experiment with a larger tube for the internal and then smaller input and output, that way you get more pressure.

just had another idea on how this could be used, use to pump glue, somehow distribute powder evenly across the bed, have it pump glue where it needs to be bonded, then put down another layer. literally print any shape and with any material that comes in power form, even metal.

That's basically what I had in mind with using it - it's hard to pump cement, but easy to pump water to bond a layer of cement, then repeat.

lol if you had a bunch of liquid nitrogen, you could make ice prints haha.

Do you by chance have a Sketch-up Model for this? If so, can you post it?

Hi Tracy, I'll upload the Sketchup files this weekend - Have you had a chance to test it with the silicone tube? I have some of the perfect pink stuff left if you need any.

This is awesome!

I'm quite new to this, so sorry if this is a basic question, but would it be possible to have the pump anchored to the frame and use a length of tube connected to the xy carrige? (similar to a bowden) Or would the vacuum lose its effect and allow flow?


Yes, that should work. I'm not sure yet how long the tube can be or how much external pressure you would need to do it this way. Worth an experiment.

With viscous stuff you may need to run larger diameter tubing on the suction side. Also, as you pull higher vacuum you need to run thicker tubing. If you pressure feed it you can get away with much lighter wall tubing and also have less of a problem with long suction lines.
I use peristaltic pumps up to 2.5" bore a lot at work; they are just great! The hose is the only thing that touches so, if you can get a hose that will survive this, you are gold! I've pumped sand slurries with them, so this pump should be able to handle the ceramic slurry needed for ceramic printing.

That's impressive. I was planning on adding some pressure in the system, still not had a chance to do much with it yet. Ceramic would be a nice goal.

I want to play around with this, but I either need your quick-fit x carriage modified to fit bronze bushings, or I need this modified to have standard screw holes to fit a bronze bushing x carriage. Ideally, a bronze bushing version of your x carriage would let me use all your extruder designs, which to this point I have not been able to try.

Update: If I can get a good print (the first one I ran out of black ABS 75% of the way through, the second was silver PLA and the overhangs were very droopy because slic3r is not saving my temperature settings), I'll try drilling holes as a temporary workaround to mounting it on a bronze bushing carriage.

I'm ordering 624 bearings and tubing. What diameter (ID/OD), soft/medium/hard (I'm guessing soft silicone)? For reference, I'm looking at silicone fuel hoses on McMaster Carr.

The hardware you are using is M4 correct? What lengths?

Just printed this, and i would like a full hardware list. (i love the design!)

Some M3 bolts are needed 20mm and the rest is M4 16mm or 20mm, you may need a few washers spacing the gear and bearings with the tube centre.

Let us know how you get on, I'll be back on this project at the end of Aug.

you're not a genius,

you are a god!!!!!

What is the mounting of that extruder designed to attach to?

Hi Marcus,

It's designed to fit my Quick-Fit X Carriage - http://thingiverse.com/thing:19590thingiverse.com/thing:19590

Quick-Fit X carriage and Extruder - LM8UU
by RichRap

How are you going to counteract the pulsating of the peristaltic pump on the nozzle?

Yes, that's part2 :)

The reduction of 4mm ID to 2mm for the nozzle helps, and even at low (manual) rpm I'm getting a good steady flow, time will tell if that stays steady enough when it's actually printing at speed.

And I am using 4 bearings to minimise the pulse effect.