The Spector Gadget Multi Holder is an attachment for the Python Prosthetic hand by Aaron Brown of Axislab 3D. You can find this hand at:
https://www.youmagine.com/designs/python-utility-hand-alternative-assistive-device

The idea was to use two child locks you can find in most stores (I bought these at a 99 cent store). They would probably work better for smaller objects if you could cut more teeth into them. They are meant to be super glued into place. (You might be able to get away with drilling a small hole from the side and putting a screw in to hold them, but I am afraid that could interfere with the spring/button mechanism.)

I would print the main and attach parts with supports. The knob part is best to print separately so that the threads come out right. Suggest printing at 0.2 mm layer height and 50% infill.

The FreeCAD files are included. Please feel free to modify and share this design.

Version 2 was not printed, it is the CAD picture. It was changed so that the distance between the locks is shorter (total length of the holder is now 120 mm). I also added another threaded block to the bottom of the attachment block to provide more strength to the assembly.

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