Disclaimer: Use at your own risk. There is no certainty of print quality. I have had no issues with strength or delamination, but your holds may break on you.

All holds are designed to be mounted with #8 screws.

Python file included to use SolidPython and OpenSCAD to generate this model with whatever parameters you want. The lines used for each of the STLs here are in the file. These feel very satisfying to use on the wall. Back to PETG HF, which provides a very satisfying dual-tex, which again is mainly so the print is faster since the lower half is irrelevant. If you want to use these as underclings that work as feet just modify the fuzzy skin settings. 

My goal with this was to create a single model to generate a better version of the spherical holds I started with. The cup parameter doesn't achieve exactly the same effect unfortunately, but if you want those just cut a circle out of a square, rotate_extrude it, and minkowski it with a sphere to add a radius. Anything I've shared code for I've tried to optimize a little better since minkowski takes a long time.