this is my 3d print version of the Magnetically Indexed HP and XP counter.
this is not the same design however the concepts are the same.
this requires 3mm x 1.5mm magnets.

works great. number snap in the place. However, to be honest I like the wood laser-cut version better
please like and post your make

when printing the dials set
horizontal expansion to -0.1,
print quality at 1.6 layer height or better
and use ironing for a smoother top layer

if you want the same top surface pattern as I had set the top/bottom layer to concentric