©Pat Ashforth & Steve Plummer 2019

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Pat Ashforth & Steve Plummer


A Klein bottle is like two opposite Möbius strips joined together.

A few years ago we made a knitted Klein bottle hat, in two colours to make it obvious how the pieces joined.

I wanted to make a 3D printed Klein bottle in a similar way.

It was trial and error until I arrived at this result.

These were the previous attempts. The details are in this blog post.