Basic Bed Leveling knobs

Bed leveling knob, and nut retainer clip. Designed for the Q3D TwoUp, but generic enough to work on others.
The hole in the knob is tight enough to self tap when driving the fastener in the first time, and does not require a nut, however the hole is also hex shaped to accept a nut if needed.
This makes for easy 1 hand bed adjustments, and mid-print adjustments.
No more fiddling with alan wrenches, and trying to hold the nut steady.

I replaced the supplied M3x30 with M3x35 for just a little extra length to account for the knob. The knob stands 9mm high to clear a 1/8" mirror bracket.
The nut retainers self-center using the springs and have a 9mm opening for the sub-bed.

this it's exactly a re-mix, but I was motivated by:
https://www.thingiverse.com/thing:103519