Depth Gauge

This depth gauge bridges the blade or the bit to accurately setup your table saw or router.

The design comes in 3 pieces only: the arch, the lever or clamp and the thumbscrew. One M4x20 hex screw and one M4 heat set insert are needed.

The sliding 150 mm stainless steel ruler is pretty common. For example here or here. 

The arch can be printed without supports, oriented on its back. The gap is bridged precisely enough to insert the lever. 

ø10 mm magnets can optionally be inserted to enhance the ease of use.

Printing was tested with PLA (mind the tolerances with other materials).
0.3 mm layer height and thick bridges are recommended. 
Both screw holes are pre supported, no additional supports are needed.