Small and economical set of radius gauges. Inside edge and outside edge of each part have the same radius, so they can be used for both ID and OD. Gauges for 1mm-30mm (1mm increments). All have small hole for string or wire to hold them together.

Print with layer heght 0.1 mm and two final layers with different color

Update: repositioned the parts in all 1-30_fix.stl and added an archive with individual parts