Szilassi polyhedron

by richgain, published

Szilassi polyhedron by richgain Oct 5, 2011
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This is my copy of the famous Szilassi polyhedron, resized for RepRap printers, including the Huxley.
This unusual mathematical shape has the topology of a doughnut but using only 7 faces and 14 edges. Each of the 7 faces shares an edge with every other face, proving that 7 colours are required for mapping on a toroid.


This printed beautifully until the apex of the model, when the excessive heat from rapidly printing the last few layers caused the tip to wilt a bit. I'm looking for a way to improve this flaw.

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This is a beautiful object, thank you for posting it. You really don't get to know it until you hold the printed object in your hand.

Thanks for this thing!!!

After printing up several of these, I crafted it's dual the Csaszar polyhedron: http://www.thingiverse.com/thing:29014http://www.thingiverse.com/thi...

...marked as a derivative of this thing, and my very first thing on thingiverse! :)

Csaszar polyhedron

Please if you can, draw the dual of this. I made this one but I don't think I can draw the dual.

It only proves that you need at least 7 colors ;)

You can fix the excessive heat on the last few layers problem by using the "cool" plugin in skeinforge. Basically, what the "cool" plugin does is, if a layer is going to take less than the specified amount of time to print (based on the minimum layer time setting, I set mine to 15 secs).... it slows down on that layer to allow it time to cool.

Another solution is to use a fan. Or you can get really basic and just blow on the print for the last few layers, which usually results in dizzyness.

I found the fan to work best. The Cool plugin just made a different kind of mess. :-P

cool only works with stepper motor extruders. With a geared motor it's very hard to contol the amount of extruded material

Enabling cooling works reasonably if you set a minimum speed, but using natural PLA (which seems really prone to slumping) I still wasn't getting a good point.

I wound up using a small bit of "Freeze Spray" as the print got to the apex, which did a great job...the only drawback is it's not an automated process so you have to watch the print. :-D