See the original for details, but use a 60mm hex-head bolt for the clamps. A future remix will likely switch the direction of the thru-bolt.
Make sure to print it sturdy. I used 6 walls and 30 or 50% cubic infill. (Do note that increasing walls is better for sturdiness than increasing infill, and beyond 50% infill returns are not significant)
Works well enough for a 16 inch reflector, and even PETG-on-metal provided a good enough grip to loosen nyloc bolts for Hexapod collimation. If this jargon means nothing to you, do one of:
I'm hosting the files for my 16-incher for anyone to follow in my footsteps, but these are just provided as-is.
The user re-uploaded this model. The user is not the original author of the model.