Bed level knob for M4 nylock nut

Bed level adjust knob for m4 nylock nut.
Better than stock, especially for small beds (like Ender 2, Tronxy X1, etc), because it locks level in place.

Original have simple threaded inserts that does not hold screw over time due to vibrations from stepper motor.


There are two versions difference being:
- height
- "ver A" is for printing upside down
- "ver B" is better for adding spacer between the part and mounting surface