Knob for socket cap-head screws in M3, M4 and M5

This is a remix of my M3 screw knob design that seems to be quite popular. I have tidied up the code, made it more reliable to print, and expanded it to cover M3, M4 and M5 socket cap screws.

It comes in two flavours: using either a standard nut, or a nyloc nut. In the pictures, the white knobs have standard nuts, and the red have nylocs - note the slightly greater height. The standard nut is easy, and usually very secure. If you feel the need for a more reliable knob then you can use a nyloc nut - but be aware that it is a struggle to fit onto M4 and M5 (M3 is fairly easy). I recommend that the nyloc nut is wound down as far as possible using a spanner/wrench, then pushed into the hexagonal cavity and the screw wound home; the problem is that it's very difficult to hold onto the knob at this point. It will be necessary to hold the outside using a vice or pliers during this process, while trying not to damage the surface.

If you want a secure fixing without the hassle, I recommend using a standard nut and some thread-locking fluid.

Parameters such as knob diameter, number of grooves around the outside, and so on can be easily changed in the OpenSCAD code.

Print Settings

Printer Brand:

Anycubic

Printer: 

Kossel

Rafts:

No

Supports: 

No

Resolution:

0.2 or 0.3

Infill: 

25% (or whatever you prefer)

Filament: Various PLA+ (or whatever you prefer)

Notes:

You can print these in any way that suits you - I did 0.2mm layers, 25% fill, in PLA+, but these were just my preferences.

I found it very difficult to get the support out of the lower cavity so, in the end, I went without it. A small amount of clean-up may be required, but it looked tidy in the end.

Category: 3D Printer Parts