Or was that a perimetric parastaltic pump ?

This is a peristaltic pump built in openscad.
There have been a number of peristaltic pumps recently and I thought a parametric one would be cool.

thingiverse.com/thing:8652
thingiverse.com/thing:8914

The motor mounting still needs some work but its a start

This is a peristaltic pump we created during Futurelabcamp Boston. It uses a NEMA 14 stepper motor to drive the rotational pump. The stepper motor driver is based on the standard design of L297/L298. We use an arduino to step it. It has it's own website on peristalsis.tentacleriot.eu

This is my design of a peristaltic pump or hose pump if you translate it directly from german.

I built this pump for reseach to gather basic hands-on knowledge of the inner workings.

If you have a MakerBot/3D Printer you can start right away. I built it in a few hours with common parts i had at hand.

Unfortunately you definitly NEED a very flexible silicone tubing, to get it really working. I did my first try with a short piece of tube i cut from our fish tank - this was definitely to hard for the ABS. unfortunately i was to eager to pump some water, so i did, but the contraption got too hot and broke.

The Pictures are from the rebuilt, but this time i'm waiting to get the silicone tube.

Currently there are no mounting holes for a motor. i used my electric screwdriver for testing. Gearmotor is planned, but i had to determine the required torque with this build.

This is a screw driven peristaltic Paste Extruder. It is still experimental, so before you decide to build it please check the following videos to see it in action:

- extruding polymer blend (hair gel):
youtube.com/watch?v=1XWYLSRCcq8

- extruding viscous chocolate glazing:
youtube.com/watch?v=qIFkw5RNXqQ

- extruding polymer blend at 16mm/sec, 0.5 mm nozzle, 250 micron layer:
youtube.com/watch?v=axAP0btw4Lk

Some pictures of the printing head: picasaweb.google.com/ioan.festeu/ReprapPasteExtruder?authuser=0&authkey=Gv1sRgCJnau7ew38qs7AE&feat=directlink
You will find a 3D pdf file attached so you can easily inspect the pump.

Also I have attached a dxf file for the laser cutted acrylic mounting plate for Rapman 3D printers. Sorry... for Makerbots and Mendels you will have to find your solution :)

CAD drawing picture shows in yellow the printable parts. The rest of parts are stock M6 threaded rods, nuts and washers and two inexpensive 606 bearings. The stepper motor is a NEMA17.

For the tubing and pumping elements I used two sets of cheap perfusion kits. The pumping elements (shown in creamy colour) are elastic latex tubes you will find in the kit. Idealy you may use standard peristaltic pump tubes.

The reason I am using two elastic tubes (dual chanel) is because peristaltic pumps suffer from the so called "pulsing". That is, when the screw leaves the tubing the corresponding void (where the tube was pinched) will suck back a little bit the pumped fluid at the outlet hence pulsing. But using two chanels arranged in anti-phase pulsing is reduced to almost zero.

Total parts cost (except the stepper motor) is less than 10 Euros.

I will come back later with a complete parts list and instructions.

NOTICE: I didn't uploaded yet the "pressing pads" (two small parts that press the elastic tube over the screw shaft) because I need to make some minor changes, but don't worry I will post them asap. UPDATED

P.S. If somebody needs the early CAD files let me know. I will gladly send it to you so you can adapt to your machine. I am working in Alibre Design PE and I can't save in other common formats so you must find a way to make the conversion.

P.S. 2 I have uploaded the file "pressing pad". You may want to put some rubbery material between the pad and elastic tube to be sure the screw shaft will completely close the pumping tube but not strangulate it. Otherwise the pump will loose the pressure.

Also I have updated the 3D pdf file.

I have attached a picture of the "perfusion set". Don't know the exact terminology in English, sorry. Some sets also have a Luerlock part connecting the needle and the latex tube. My Luerlock file supports that part. Obviously you can use any kind of support that fits you better.

UPDATE 1: watch my third video (I have listed above).
I will upload asap a new screw rotor design. I am not very happy with the current one since it seems it have some bugs: it creates some extra pressure when the rotor leaves the tube hence altering the low pulsation feature.

UPDATE 2: I have uploaded a new screw rotor design (Screw Rotor New.stl). Screw pitch was decreased from 12mm to 10mm so motor rpm will increase just a little bit. It should perform better than the previous one. Will come back with my own results.

UPDATE 3: Uploaded the file Screw_Rotor_New_Support.stl. Unfortunately this file must be printed with support (soluble PVA, PLA?). However this rotor leaves a smaller footprint on the elastic tubes hence less dead volume (less suck back). Still working for the perfect match to bring pulsation close to zero.

UPDATE 4: Check my photo album: picasaweb.google.com/lh/photo/oN2Z_e3g6u7eHZYbbXj2nQ?feat=directlink
It is printed using the part "Screw Rotor New.stl". Pulsation is so small I think is a good print. Just a little bit of adjustment is needed. The trick is to find the perfect match when the helicoid is fading (leaving the contact with the elastic tube)such as the dead volume arising is compensated by the incoming volume of the same chanel. Meantime the other chanel is pumping normaly. And so on. For the perfectionists I promise I will fix this to make it even better. Meantime I am preparing new .stl files for the final version. I need to clean up the bugs in some of the parts (there are plenty) and may be to make the pump smaller and with less nuts and bolts.

UPDATE 6
About the cheap latex tubes: very short lifetime, losing elasticity. So, go proffesional peristaltic tubing. The pressure will be perhaps around 0,7 bar with those tubing. Now I am waiting for the tubes to be delivered (2-3 weeks). Meantime I will try to cast my own tubing from RTV silicone. Keep you updated.

Inspired by the comments.

Laser or Mill it out of 7mm Polywood or else use
4xM8 screws to bold the Bearings in and
4xM4 screws to bold the Case

Use this simple pump to move fluid around in small quantities. It may require more torque than you expect.

Please note, I have NOT built one of these yet and you will need a HEATED BUILD PLATFORM to print this object.

Here is a pump that can be used for liquid or air. A piece of 3/8" diameter surgical tubing is looped through the 2 holes on the left side of the pump base around a 4 point rotor that compresses the tubing pushing the liquid or air ahead. This technique isolates the material being pumped from the mechanism itself. The rotor design could be improved greatly by placing wheels at the end of each point pushing against the tubing.

UPDATE on 05/31/10: The STL files below look like they need something 'added' in order for SkeinForge to generate the GCODE. I have spent days trying to figure out why and how to fix it. I thought an STL file was mostly a list of ASCII lines and did not realize centering and size info are not being saved to the files.

This is a Peristaltic Pump designed in Sketchup. I have tried to design it with an eye towards printing on a MakerBot, but do not own one so I cannot test at this time.

It should accept 3/4 inch hose with a 1/8 inch wall thickness.

Make to use stepper motor from Sparkfun and skate board bearings.

I have not made and tested this yet, I need someone with a machine to make it. Any volenteers?

Update: I have updated the turret_pump to make it makerbot friendly