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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.
Parametric Knob by alasdair53 is licensed under the GNU - LGPL license.
So what's this mean?
We're sure alasdair53 would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!