On Thu, 28 May 2020 at 01:13, Chris Albertson <albertson.ch...@gmail.com> wrote:

> By total coincidence, I just made both.  I needed 30T, 40T, and 60T
> pulleys.   I tried printing them and they fail after a while.  The plastic
> simply will not hold the set screw then they slip on the shaft.

There was an interesting solution to this on Hackaday a while back:

https://hackaday.com/2019/09/02/misuse-this-part-to-attach-3d-printed-stuff-to-a-shaft/


-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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