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Modular Moineau extruder

by Alienus, published

Modular Moineau extruder by Alienus Jun 18, 2012
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Summary

A Moineau pump based paste extruder.
suited for printing different pastes.

The moineau design has been tested with chocolat. For this model: wax, ceramic clay and moldable plastic will be possible aswell.

for the actual printing of chocolate a double walled part/module will be prefered to allow heating of the parts. (or use a resistance wire with an attached temperature controler)

Instructions

Edit: the rotor and Oldham-Midle will be re-dimensiond to allow a smoother functioning when printed with a lower resolution.

This paste extruder printhead is inspired on the Moineau extruder thingy from Ttsalo and redesigned for use with other pastes than chocolate.
(where cleansing with boiling water is not possible)

It is a modular design so feel free to edit any module to adjust these to the paste you want to use it for. and will save costs if a part needs to be replaced due to wear & tear, or due to an unsuccesfull cleaning of a used paste. Especially the stuts and mountbase will require an other design for fitting on different printers: the mounting points on the inlet part are intended to be used for different adapters (in this case studs) to allow the fitting on different printers.

The parts are printed using a Dimension 1200ES, which allow for small spacings between the rotor and stator 0,245mm. printers with a lower accuracy may need a larger spacing.

For the assembly 35 M3x10 bolts are needed with M3 nuts.
(the same as are used for attaching the Stepper engine.

The insert is designed to allow the material to be pushed in with the aid of a plunger.

If u use the Repman based foot a threaded rod is required to use for the action of the z-axis switch (the foot is made as the standard bolt tends to miss the z axis on rare occasions causing problems.

As you might notice the stepper-motorshaft hole has a flatened edge.
this is done as the axis of our stepper engine has a side filed of to increase grip and avoid the snapping of a clamped part design.

THe use of pressurized air is not (yet) possible: the printed parts tend to be semi-permeable and let water and air run through "solid" walls.
a surface coating or impregnation could solve this problem but has not yet been tested.

.ipt parts will be added later to ease re-design and creation of additonal modules.

The O-ring grooves are designed for 22mm x 2.5 mm O rings but near similar sizes can be used aswell.

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I´ve printed the o´rings and remade a longer rotor couple.
https://www.thingiverse.com/thing:2381369

Modular Moineau O´rings

Can sombodey help -The file
rotorlowerres+25mm_spacing.stl
is corrupt

Please send me stl file.

Best regards,
Thank you
Darko

I built this excellent design on a Replicator 2 in PLA. It works really great. I had some problems with tolerances on the stator and rotor but they were ok when printed at high res. I very much appreciate Alienus providing the STEP file because the downloaded STL file for the stator would just not print. I used the STEP file to generate a new STL and that was fine. I also was able to modify the nozzle STEP to add a luer fitting so I can easily try different tips. I also put a luer on the reservoir inlet so I can simply attach a filled syringe. Most people post a SCAD file which is pretty useless as you cannot convert it to anything editable.
Wonderful job ! I have wanted to build a Moineau pump for years but now with 3D printing it is a reality. Next step is to seal the motor shaft and test with a clay slurry.

I recieved a question about the revolve speed of the rotor:
the stepping we used for chocolate was 5 to 20 revs
(slow - high speed).

some side-remarks.

when i was working with a easy to clean test liquid during with the density of shampoo/handsoap my revolutions, especially in reverse went up to compensate for the small gap between rotor and stator.
this gap will depend on your printing quality and should always be as small as possible. (printing an oversized rotor and then sanding it down was no option to me due to the complex shape of the rotor, but more complex machining or with time on hands it can be accomplished (also because the rotor will have a sanding/honing effect inside the stator with abrasive liquids).

Have you manage to build and test this extuder?
Pulsation is a big issue with liquid printing.

would love to see assmebled one

Hi Jeroen,
No problem about the late reply. We didn't have time here either too continue working on this but we just picked it up again so I am happy I noticed your reply while looking again at this design. We'd be very happy to merge ideas together in a single design. We'll print yours this week to get a better look at it.

I made it watertight by printing in ABS and a quick dip in acetone to seal everything, and by using rubber seals in between all parts and a shaft seal on the motor shaft.

Any issues with the materials flowing upwards to areas where it shouldn't? Or is the upward flow towards the motor shaft cavity something that is negligible?

So far none of the materials have been flowing upwards. neither when te extruder is put on 'reverse'  for a longer period of time.
note that this might change if the inlet is filled higher than the coupling room itself when using a more liquid paste.

I would very much like to get the files for the water and pressure tight version. Please let me know how you could get them to me. I have a dimension machine, so high tolerances are just fine for me.

GREAT! I have modified the original to be water and pressure tight but haven't found time to upload all mods. Since you are in Holland it might be interesting to bang the heads together to merge this in a single modular design. Where are you based Jeroen?

I am based nearby Delft (study) / Haarlem (living place)
and i would really like to take up your offer to design a single modular design.

The water and pressure tight solution sounds very interesting to me and would enhance my knowledge of these printings.

My sincere apologies for my late response. the holidays and replying to the message in my mailbox (assuming it would be placed on the forum / in a PM like with most websites i know) ended up being send to the mailman.

Hi Jeroen,
No problem about the late reply. We didn't have time here either too continue working on this but we just picked it up again so I am happy I noticed your reply while looking again at this design. We'd be very happy to merge ideas together in a single design. We'll print yours this week to get a better look at it.

I made it watertight by printing in ABS and a quick dip in acetone to seal everything, and by using rubber seals in between all parts and a shaft seal on the motor shaft.

sorry posted twice, there was some hiccup in the commenting system :)

Any chance for a reduction in file size/detail/etc for the stator and rotor parts? I can't seem to open them in anything without crashing.

Great work as well! Looking forward to trying to print ceramics.

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