I made the pencil guides to help Mary design ruler quilting patterns, but sometimes she must line up the ruler with a feature on an existing pattern. To that end, we now have a reticle guide:
The general idea is that it’s easier to see the pattern on paper through the crosshair than through a small hole. You put the button over a feature, align the reticle, put the ruler against the button, replace it with pencil guide, and away you go.
The solid model looks much more lively than you’d expect:
Printing up a pair of each button produces the same surface finish as before; life is good!
The OpenSCAD source code as a GitHub Gist: