Speed Multiplier / Divider Knob
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To either rotate the printer knob faster or slower (for more precision), a gear input is offered.
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- Creative Commons — Attribution
My Ender 3 requires 4-5 knob inputs to change nozzle temperature. Some printer knobs provide very course inputs, where setting a value is difficult because of over/undershooting desired set point. To provide a gadget that addresses both issues, the Speed Multiplier / Divider Knob is offered. I used the Fusion 360 gear generator to design the gears.
Functions: Place the small gear on the potentiometer and turn the large gear to obtain a rotational speed increase (3:1). Or place the large gear on the knob and turn the small gear to reduce rotational speed (1:3). In either case, turning the gear on top of the knob provides no speed change.
I was too inept to add an intermediate gear to allow rotation direction to be consistent between the input and output gears.
The unit is a single print without support. The clearance (tolerance) between the gears and the base is 0.4 mm. The gear shaft to hole clearance is 0.5 mm. It broke apart using a hammer and knife.
Two-sided tape holds the assembly to the panel.