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I make star knobs for use in DIY projects. First of all, I created the model by 3D drawing. Then I opened this model in Cura program and printed it on my 3D printer. Very nice knobs came out.
These star knobs that I designed as 6 and 8 mm have been great. Can be used with M6 and M8 bolts. I will use it in many of my projects. There is a link below to download 3D files (stl files).
Making Video :
Go to this video's Youtube page and make a comment.
STL files Download : 3D Printed Star Knobs - 6mm & 8mm
Did you see this ? Wood Knobs Making
I make a wood cutter from a angle grinder. This wood cutter looks like a circular saw.

You can use it both to drill 90 degree holes and to drill holes in the depth you want. It also works for joining two woods together, you can see in the video.