TM680/TOM680 Rotary Encoder Knobs
thingiverse
These are replacement knobs for the TM680 keyboard. There are three versions: regular cylinder, filleted cylinder, and chamfered cylinder. The knob's outer diameter is 19.5mm, and the stem hole (D-shaped) diameter is approximately 6mm. As printed on my printer, they fit snuggly on the TM680, but not as snuggly as the stock knob, which I often had difficulty prising from the stem.
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