Has anyone with a paste extruder ever had it suck in more paste in

3D Printing
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1

Has anyone with a paste extruder ever had it suck in more paste in between layers?

2

I don’t have one, but most of the ones i look at only squeeze, they use belts under tension to do this. Sucking would be impossible :wink: .

3

There are some that use a screw to drive the plunger. Those, I think would be able to suck in more paste.

4

The screw drives i have seen are the progressive cavity pumps (but i have really be looking into those only) the progressive caivity pumps wouldn’t need to suck it back in, they feed from a hopper. I have not tried it myself so…

5

The progressive screw type requires an air compressor, sufficient gravity or another assisting force to work. I am not sure what to think about the additional requirements, but it is outside of the point of this topic. I get curious about things from time to time and the bolt/screw driven syringe is what I am curious about at the moment.

6

@NathanielStenzel I am using a big Moineau pump sitting on the floor right now. This beast will pump a thick paste at 20 bar and needs no air compressor. My former test that did not work out used a mini pump that was fed with a small air compressor as our paste won’t flow just with gravity.

And if pump is rotated backwards it will reverse and suck in no problem.

7

@Miguel_Sanchez can you share the design?

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@Nicolas_Arias I am using a commercial pump not a 3D printed one.