This device holds on to your calipers magnetically. Makes for easy snap-on and removal!
Take a measurment (L) and multiply by 2.41 to get the radius (R). The conversion factor is printed onto the tool, so no need to remember by heart.
0.2 mm layer height
3 perimeters
15 % infill
Pause the print at 3.20 mm so you can insert the magnets
The author hasn't provided the model origin yet.