Summary

I got the Groot from: baby Groot standing waving w stand by dav88.
The Groot file is small enough to open in Tinkercad and other model editing programs.

Neodymium Magnet size 1.26in D, .125in thick

The MH (Magnet Holder) is the part with the tabs on the side where you put one neodymium magnet.

The MHH SG (Magnet Holder Holder) is the base that Groot is standing on and is the part that the MH goes into, rotate MH in MHH 90 degrees to lock the magnet inside, so you don't have to glue the magnet in.

The SMH (Shoulder Magnet Holder) is the part where you put a second magnet in and put it under your shirt on your shoulder. There are holes to add a string so you can turn it into a neckless, so if you take Groot off you don't lose the second magnet.