Moineau stepper extruder
by ttsalo, published
The pump geometry is based on thingiverse.com/thing:7958
Should work as a plug-in replacement for a hot plastic extruder in a 3D printer. However, I have NOT used this to actually print anything. I'm just publishing it in case someone else wants to try it out. (I think it's ready for printing a very small pizza without toppings, but beyond that I cannot say.)
Almost everything is parametrized and adjustable from the SCAD file. However, the resulting design should be evaluated to see if it is still sane after adjustment, since not all of the features are automatically calculated. Particularly the flange and driveshaft diameters must be adjusted by hand to match the other measurements.
See it in action: youtu.be/OHQiKuQvuEU
Note: obviously it is impossible to build an object from material that flows on it's own - the object would not hold it's shape. So in practice the material has to either be pulled into the extruder by a negative pressure (impossible with PLA printed pump parts) or pushed into the extruder by a positive pressure. In either case the motor axle has to be sealed, or it would either relieve the negative pressure or allow the material to flow up and out from the inlet block.
Recent Commentsview all
The mathematical model for generating the pump geometry was created by emmett for this: http://www.thingiverse.com/thi... thing. He can probably explain it better since he wrote the original.
If you need a pump with different geometry, you can modify the parameters in the scad source file and re-export it from OpenSCAD. The sources are included in both this and emmett's original design.
Hi, recently printed this model on an Objet 250 using clear resin and assembling now. Do you have the original CAD file (possibly not willing to give away), or can you explain the math behind your rotor/stator. I wish to design a very very small pump and am having issues with the math. Many thanks, Chris.
The derived chocolate extruder has instructions on how to set up the software for printing:
Liked Byview all
Give a Shout Out
There is a seal retention ring near the motor mount inside the inlet block, so that the motor shaft can be sealed with some kind of a seal. With this done, the inlet tube may be made thinner and a flexible tube connected to it for feeding the extruder from an external pressurized reservoir. (This part is still work in progress.)
You must be logged in to post a comment.