This has screw holes to attach to a wall, or in my case, I attached it to a small block of wood with a 45 deg cut to hang on my French cleat wall.
for the larger clamps, you'll need to leave a slot open between them because they are wider.
To print, just print it flat on it's top and no supports should be needed.
I added a second version that spaces the slots out. I found that the original was too tight if you use the deluxe match fit clamps (with their larger heads)
The author hasn't provided the model origin yet.