Printable Peristaltic Pump
by asbach, published
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.
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stepper motor would be great for this (and would most likely have enough torque on a nema 17 or larger stepper to run the pump without gearing it)
Do you think that a tourniquet would do the trick? I hope that's the right transation for the tubing that's used for blood withdrawing.
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While printing dismantle the Pc Fan amd harvest the ball bearings. Broken PC Fans are a great source for these. Either you remove the splint from the backside, which can be tricky, or - i prefer the hammer method - search for the upper end of the axle in the middle of the propeller. Use a center punch and a hammer and remove the axle from the propeller. the Fan will split up in its pieces.
If the fan says maglev let it be. those fans have a magnetic bearing, so nothing to harvest inside.
Take the pump base and insert the 8mm ball bearing from the fan in the center hole, just as much that it's even on the inside. put it away.
Take one X shaped part and screw it onto the M3x30(-40)mm bolt, add a M3 nut, one-two M3 washers and finish the stack with another M3 nut. You may tighten them.
Drill the center hole of the 2nd X Shaped part just as much so you wont have to screw it to the M3 rod. Take the blind rivets and cut thier shaft in 12mm pieces. insert them into the 4 holes on the 2nd X shaped part, using gentle force and a hammer.
Stack 2 M2 washers, one wheel and 2 M2 washers on each axle.
You can also only mount one pair of wheels or just one wheel, tis thing is made for experimentation.
Put the wheels X thingie on the long M3 bolt. Match the axles as good as you can and use a gripper to press the axles in the other X part's holes.
Finish with a M3 nut.
The wheels should turn, easily. if you tighten the last M3 nut and the wheels stop turning, you have to add another m3 washer in the middle.
put the roller wheel into the base and fasten it with a M3 nut.
Insert your tube and close the pump with the top cover and some plastic screws.
As tube i ordered a silicone tube outer diameter 6mm inner 5mm. i think this will be the optimal tube for a self printed pump, that should work without electric screwdriver in the future.
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