Adrian's polyfilla extruder...

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But the compressed air is really easy - it's just a bicycle pump. You
give it two or three pumps at the start, and it's set to go for all the
paste in the balloon.

However, today I did find a problem: the balloon goes down the paste
exit hole and it gets stuck. But I'm sure that this can be fixed -
just put a tube with holes all down it up the middle of the balloon.

This proto^2 type is made with little bits of turned brass, but I think
I can get rid of most of them and replace them with RP. Here RepRap
does better than the Strat - we make gas-tight stuff; the Strat output
needs to be painted with a solvent to seal it up.

Yours

Adrian

[staff.bath.ac.uk]
[reprap.org]

Quoting Forrest Higgs :

> Looking at what Adrian's done I think there might be a better way to
> do the job. The key to the idea is Adrian's balloon/condom but
> there's a better thing to use.
>
> Think of a plastic Colgate toothpaste tube. Empty one of those, screw
> it into a reprapped extruder barrel, trim off the far end and fill it
> with polyfilla. Put a clamp on the open end to close it and mount the
> clamp onto the top of your reprapped extruder mount. Force the
> extrusion thread out by using a solarbotics gearmotor to push a
> double roller down the tube to squeeze the polyfilla out of the
> extruder orifice.
>
> Viola! No compressed air. :-D
>
> It's kind of like Adrian's peristalic pump writ large. :-)
>
> Unlike the tubing used in the peristalic pump the toothpaste tube
> doesn't stretch noticeably.
>
>
>
>
>
>
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***Here RepRap does better than the Strat - we make gas-tight stuff; the Strat output needs to be painted with a solvent to seal it up.***

Cool! Didn't know that.