Klein bottle piggy bank (coin bank)

by _primoz_, published

Klein bottle piggy bank (coin bank) by _primoz_ Dec 13, 2016
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A perfect gift for a thrifty mathematician.
(Make sure that he/she is not one of those topology haters)

This is a piggy bank (coin bank) in shape of Klein bottle.
You put money in a hole and it travels trough a tunnel into a belly of Klein bottle.

I think it looks really good when printed with transparent/ semi-transparent material and with one perimeter thick wall.
When printing in this way, please check G-code in g-code viewer to make sure that wall is only one perimeter thick.

Numbers in the name indicates wall thickness: "Klein_bottle_piggybank_01" means wall thickness of 0.1mm and "Klein_bottle_piggybank_15" means wall thickness of 1.5mm.

For better looking prints, you can also lower layer height towards the top of the Klein bottle.

If you have any questions or wishes for different wall thicknesses or maybe just bottom thickness, please make a comment, I will see what I can do.

Print Settings


Renkforce RF1000






0.2 mm


It can be printed without supports, but it also depends on your printer settings.

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hi, i'm trying to print this but the model looks all broken in the slicer, and i don't know what to do. did you have similar problems?

you have to try different ones with different wall thicknesses and see which one will give good results. It also depends on extrusion width.
For example Slicer Prusa edition 1.36.2 : Nozzle size=0.4mm, External perimeters extrusion width =0.5mm, Detect thin walls=ON, Layer height=0.2mm, Klein_bottle_piggybank_04 makes a perfect one wall thick print.

Play around with those settings, and see if it works.

To extract coins, do you have to send them through the tube backwards again? That seems frustrating.

Yes. If you look at the first picture: Spinning it counter-clockwise sends coins inside. Spinning it clockwise sends coins back outside. It is not that frustrating. Even if it is completely full, you turn it around couple of times and it is empty (depends on coin size - they come out in batches).
I wouldn't use exactly as a coin wallet, to pay with it in stores, but more like a saving bank, where you put inside spare change and empty it when it is full or you need money.
It is not the most useful compared to other piggy banks, but is very useful compared to other Klein bottles.