Multi turn potentiometer (worm gear)
Free

Worm gear with a ratio of 1:70 (approximately).  This is more than needed, but it works well. I used this design to adjust the voltage, and it so happened that one turn equals 0.1 Volts. The worm shaft needs to be printed vertically for better quality.

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Multi turn potentiometer (worm gear)

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4 downloadable files:

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gear.stl
STL Model
1.2 MB
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worm.stl
STL Model
1007.8 KB
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box.stl
STL Model
363.9 KB
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knob.stl
STL Model
1.0 MB
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