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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
This is the page that contains the desktop jointer's videos. You can view the 3D model video. You can download the PDF plan.

If you want to do a smooth sanding, you need a tool like this. This sanding tool, which looks like a hand plane, will come in handy.