The author remixed this model.
I have created a grip which is exact (scaled a few milimeters up) shape of Game Boy Color. This gives a WAY better placement for the thumbs (they do not crunch anymore) and it is a JOY to use the Miyoo Mini Plus ;)
It doubles as a screen protector / flippable case - as I have based my design on this flipable version:
https://www.printables.com/model/596790-miyoo-mini-plus-flippable-case
My grip has a lot of details thought out:
It is really comfortable to hold - just as the OG GBC ;)
I have added the step file as well if you would like to modify it to your liking.
Prints straight, with all the supports - in my case the supports came out very cleanly and I did not needed to fiddle with it at all.
I added a 1mm filc at the bottom - it gave a very nice snug/smooth fit. Also I have put a very thin strip of grip tape on the iner wall - I like when its snug locking but smooth to pull out.
Good luck printing!