This is a redesigned mount for the brio 300 with support for tilting, like the original one. I did not include the rest of the holder, as it is very specific to my monitor. You can use the stl in your own designs if you want.

Printing:
Print this piece on it's side with low resolution and the less complex side down. One of the sides just has a round hole, while the other one is a bit more square and has a little pin-hole. The latter side should be up. Place supports inbetween them. If your slicer allows, don't fill the holes with support as it can be difficult to remove.

Disassembly:
I'm sure you can figure it out, but here are some pointers. There are stickers over the holes on either side. One of them just has a metallic block, the other one has a very small screw. Remove the screw, then you will have to align the pinholes internally by tilting the camera to the right position so the pin can slide through fully. Tilt forward and backwards and push into the screwhole with a small screwdriver or something until the pin moves. You will have to push quite hard, as the iron block on the other side sits pretty tight. Assembly is basically that backwards. Slide the pin in and tilt forwards and backwards until you get it mostly through. Align the metal block with the four corners on the print, then use pliers or a hard surface to push it in all the way. Lastly, the screw. Done!