This InfinitySink install guide is made for the popular electric skateboarding heatsink available from here:
https://forum.esk8.news/t/infinitysink-universal-heatsink-top-mount-boxes/41869
These are not super common nowadays, but there are quite a few out there. Someone may find this useful, but either way, this design was adapted from my top-mount ESC box lid, and cut down to use as an enclosure cutting guide. You may buy this top mount enclosure, named ESCHome Modern here:
https://www.pevcomponents.com/product-page/esc-home-modern
The InfinitySink Variant will be available shortly.
Printing for this model is very simple. I recommend 2-3 walls minimum for rigidity and 20-25% hex or stronger infill. I used PETG for mine, but most filaments will work just fine.