Parametric Knob

by alasdair53, published

Parametric Knob by alasdair53 Feb 7, 2011

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Parametric Knob by alasdair53 is licensed under the GNU - LGPL license.

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I lost the knob for a random consumer electronics thing, and I thought I'd print a new one - well, you know how one thing leads to another, usually an SCAD script, in my case.

This is a snap-on knob for a shaft with a flat - there's an internal stress-relieving slot that helps the thing absorb the strain of pushing it onto the shaft.


Measure the shaft you want to slide this on - my shaft had two portions, with slightly different diameters. The flat is on the top half (!). The awkward +0.5's are a way of compensating for my Makerbot's printing holes smaller than I'd like. (But see http://www.thingiverse.com/thing:6118 and assorted blog post http://hydraraptor.blogspot.com/2011/02/polyholes.html)

Measure or calculate or guess the height of the knurled section you want (this is the bit you hold with your fingers).

Decorate the bottom, if you wish, with a skirt.

For real added credibility, add a dome on the top. Don't be excessive.

Enter the parameters to the beginning of the script, run it, and print the resulting stl.

Have fun!

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