This is a remix of thing:39459 to perfectly fit the helloBEEprusa bed leveling nylocs.
The dimensions are a bit too perfect, you may need to file the outside a little to avoid hitting the printer frame while the bed is moving.
The values changed from the original SCAD are the following:
knob_height = 5.2;
knob_diameter = 8.0;
knurl_count = 4;
knurl_diameter = 0.7 knob_diameter pi / knurl_count;
nut_width_flats = 5.50;
I reuploaded the SCAD with little change to make this thing customizable but it is not working 100% (nut hexagon not subtracted), if you find out why it works on openSCAD but not in thingiverse please leave a comment.
All the credits go to andygock for his excellent work.