Plates with rulers AND grooves to lock stuff

Some stuff I have to put on the plates must be hold by something. The holder will help lock them into place. 

You WILL need to print your own locking tool that will go into the holder, obviously, since your needs will probably be very different from mine. Teeth are 5 mm long, 2 mm  wide. Spacing between teeth is 10 mm.

Added symatrical, circular grooves on the round plate, and orthogonal ones on the squarish plate. And build two holders, one for the round plate, one for the squarish one.

Color change at the fourth layer (grooves at 0.6 mm deep).