Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5241872.
This is knob number 2 based on the Z-Axis Knob for Creality Ender 3. I included a direction arrow and text for up or down, just as a visual reference. Two versions are included, one with an up logo & arrow and one with a down logo & arrow. You may also want to use a bit of eclectrical/insulation tape to help afix to the z-rod.
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