Thank you for making the original.  It had nearly everything I needed, except I also needed knurling on the inside of the drum stem clamp and for convenience anti-turn catches for the nuts that hold the clamps.

I made this with tinkercad, so I some parts may have visible lines where they should not.  I have not printed this yet, but I'll be trying it out within the next day or so.

As it turns out the original model used about an 18mm hole, I intend to use this to hold an electronic drum component, so the hole needs to be about 23.3mm.  Also, the thumb screws that come with the roland clamp use bolts that expect to pass through a 7mm hole.  The screw holes in this design are about 4.85mm.  I'll be adding a second model with the larger holes.