Magnetic mount for a dial indicator*, designed to screw in place of a 40mm fan (or over one). Makes it easier to level a build plate more accurately. The digital dial indicator in the picture is 57mm in diameter.
Uses short M3 socket cap screws to attach to the fan mounting holes and 5mm x 3mm cylinder magnets* to hold the dial indicator in place.
Filaments:-- Atomic Transparent Orange PLA