Countour Gauge

With this tool you can copy the form of the wall surface.

Use the marker with the neck <7mm (e.g Q Connect OHP permanent fine marker). The pointer has three pen position the middle one for the tip and side ones for deep angel areas.

I recommend to print the Hub at the vertical position to get as smooth surfaces as possible. The Pointer & Liner should be print at the position so that top surfaces print lines will be longitudinal orientation. This way you'll get as smooth travel as possible.