Klein bottle piggy bank (coin bank)

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.