by keesj, published

simple-paste-extruder by keesj Nov 11, 2013
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Get the openscad code from https://github.com/keesj/simple-paste-extruder

Simple paste extruder is a minimalistic extruder for 3D printing using pastes. It only use very few non printed part that are widely available mainly:

A syringe . The syringe has a diameter of 3cm and a height of about 11 cm long
M8 Bolt (80 mm long)
M8 Nut
Stepper motor of type 28BYJ-48 (about 5 euro http://www.vanallesenmeer.nl/5v-stappenmotor-met-ULN2003-driver- )
The code uses the MCAD library containing LGPL code it also used the Rack and pinion gears. that part of the code is GPL

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Where kids learn to have fun with technology and programming

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idea for improvement: make it so that it can be mounted to a 3d printer X carriage

otherwise a very simple design.... you could even improve it further so that the bolt could also pull the plunger up

Nice idea, a remix did exactly that see http://www.thingiverse.com/thing:676336

This design is in need of a small remake :O


quick note: the speed at which the plunger is dropped is relatively slow unless you have a motor.

I am not done printing this yet, but I think the piece that holds the stepper motor could stand to be a little thicker or to be printed as a separate piece that inserts into the main piece. The way it is, it might be a bit flimsy. Meanwhile, according to printer settings, printing a thin standing object may be problematic. Printing that stepper motor holder as a separate piece would allow it to have the layers cover the whole part and be much stronger.

OK. I have finished printing it. The area that holds the motor does seem to be weak, but of course then I was also having adjesion issues. Out of a 60cc syringe, this will get you about 25cc of usable plunge distance.

Hi nathanstenzel,

Do you have suggestion on how to improve the design?

Hi again! :)
I have the right syringe, bolt, nut and motor, but I can't figure out how to prevent the bolt from turning? It just spins around when the gear is turned. Do I need to glue it to the plunger?
And how do you attach the syringe - using glue, or can I use an elastic band?

I did not need to do either. I just turn the bolt until there is some pressure on the seringe. This prevents turning of the bolt and the seringe from needing to be secured. To be able to refill it is nice if you can turn the bolt by hand.
To prevent the turning of the bolt you would need to guide the bolt. This can be either done by printing a guide or drilling a hole in the bolt and inserting something like a spike. It should not be to hard

What size of syringe is that?

About 3cm(1.1 inch) diameter and 11 cm(4.3 inch) long(without the needle)

Is the construction sttong enough? Dors ot work ok?

Hi, yes the construction works really well. I have had no problems so far.

I have used it in different projects including the 3d choco printer you can see in the following video(not moving do)

I have not tried other stuff like clay so I can't comment on how that works

="thingiverse-d0a62b2b138867d96f0521c38484b4c3:disqus" href="http://disqus.com/thingiverse-d0a62b2b138867d96f0521c38484b4c3/keesj This is awesome! Way to go!

it was only after I printed extruder_print_all_v2.stl that I realised that version 2 does not have the holes for the M8 bolt. Why is this?

Hi, this is a bug I will fix later today! thanks for commenting

Thanks Kees - I really love the simplicity of your design! And the Lego-based 3D chocolate printer is awesome - will you make the final design available sometime?