by emmett, published
I thought this might be useful as a paste extruder or something of that nature. It's better than a peristaltic pump because no flexible hose is needed (which tend to reduce efficiency and wear out), plus it doesn't pulse.
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i would not recommend it. for the pump the be able to move and maintain a seal, either the rotor or the stator needs to be able to deform a little. with 'real' pumps, they use rubber, but since we're using hard plastic, a thin wall will have to do.
I've read Moineau pumps use a rubber-like stator. I know there are flexible filaments. Do you think printing the stator with that will improve performance?
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The rotor slides down into the stator; it's a tight fit, but that helps it seal. Once it's lubricated by whatever you're pumping, it'll go easier. The crank twists onto the rotor; no need for glue. It'll stay tight as long as you're pumping the right way (fluid moving toward the crank), but it'll fall off if you turn it backwards.
No need to prime the pump, just submerge the base in fluid and crank away.
A parametric OpenSCAD file is included so you can change the parameters to suit your needs. It will display the pumping rate based on your choices. You can also change the tolerance, though I found it works fine with zero, just relying on the flexibility of the plastic. I also made the wall thickness exactly two tread-widths wide, so the dimensions would be accurate. You may want to change this for your printer.
UPDATE: Thanks to Proton for making an animated version of the OpenSCAD file. This version is now included, so you can control the animation for yourself.
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