PETg dual extrusion polyhedral dice

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Tim
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PETg dual extrusion polyhedral dice

Post by Tim » Fri Oct 02, 2015 4:24 pm

For a long time, I've been wanting to print a dual extruder piece using an opaque white PETg core under a few layers of translucent PETg in any of the available colors. I finally got around to doing that, and the result is just as fantastic as I hoped it would be. This is something that hybridprinter talked about a while ago---printing digits that connect from the surface all the way down to the core of a print so that they cannot be rubbed, filed, or sanded off.
dual_dice1a.jpg
Octahedral die, dual extrusion PETg translucent and opaque combination
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Mark the Greater
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Re: PETg dual extrusion polyhedral dice

Post by Mark the Greater » Fri Oct 02, 2015 4:46 pm

That is really, really neat!
Love Always,
MtG

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Jules
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Re: PETg dual extrusion polyhedral dice

Post by Jules » Fri Oct 02, 2015 7:16 pm

Fantastic job Tim! :D

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jdacal
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Re: PETg dual extrusion polyhedral dice

Post by jdacal » Fri Oct 02, 2015 8:38 pm

Nice!
jdacal

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Tim
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Re: PETg dual extrusion polyhedral dice

Post by Tim » Fri Oct 02, 2015 8:46 pm

I found one trick, which is that if the part you are printing is smaller than the distance between the two extruders (31mm), then the extruder that is inactive is always dripping outside of the print, and always wipes itself off on the ooze shield as it comes into position, which makes for a much cleaner two-color print. Unfortunately that doesn't work with large prints.

Dale Reed
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Re: PETg dual extrusion polyhedral dice

Post by Dale Reed » Mon Oct 05, 2015 12:39 am

Keeping this in mind for my homebrew calculator project. I got an HP-25 for my 18th birthday (not a car), perfect for a long career in engineering. HP calculators from the last version of the HP-35 thru the 45, 70, 80, 55, 65, 21/22/25/27/29C, 31E/32E/33E/33C/34C/37E/38E/38C, 41C/CV/CX and the 10C/11C/12C/15C/16C were are made with double-shot injection molded keycaps, for that very reason (no paint to rub off), and I was hoping to do the same on my project. Thanks for giving me hope, Tim!

Now, I just need to get some nice fine nozzles for my dual (0.25mm would be nice) -- otherwise, the keys will have to be too big to be legible...

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Tim
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Re: PETg dual extrusion polyhedral dice

Post by Tim » Mon Oct 05, 2015 1:50 pm

Dale Reed wrote:Keeping this in mind for my homebrew calculator project.
I mentioned hybridprinter, but maybe it was you that first mentioned the dual extrusion keys. It was a while ago. The printing for calculator keys would probably be no more than one filament width wide, which would make it quite tricky. On my 20-sided die, though, the lettering is about 4mm tall and quite legible. Even the ones that were printing upside-down at the most severe angle, which is more than a 45 degree lean. That's bigger than the traditional HP calculator keys, but not unreasonable for a calculator, in general.
dual_dice2a.jpg
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