Prusa Core One corner plug

Prusa Core One is far from perfect. Has way too many holes leaking warm air and preheating takes longer than it could be.

Print 4 (3 if you have Buddy3D camera in one corner) parts, insert 3 magnets in each and attach from inside. Not perfect but much better than without them.

PETG recommended. No supports needed.

I made file for 6x3 magnets. Let me know if you prefer different size of magnets and I will share file for it.