Printed in 3 parts. Cap can be securely pressed onto shaft, but I also used some superglue. I advise printing as a solid object. It a lock feature to prevent the tube from unrolling. Simply press the shaft inward to engage the lock and pull out to disengage.

I didn't like that the original was somewhat hard to print with the overhangs, and the shape of the spinner was not comfortable to use. This is easier to print and slightly larger.

I recently made a v2 after several months of use, because one of the two inner bars broke with some force. This one is slightly thicker and better to print, in the hopes that the additional thickness takes more force to shear.