Summary

When printing ABS on Ender 3 with an enclosure and ultrabase, bed temp needs to be at 110 deg C to get good bed adhesion. But the problem is, the controller being cooked together inside the chamber. So I will try this custom box to keep the controller cool outside.

I FINALLY GAVE UP ON ULTRABASE

Even with enclosed chamber (~40 deg C), I still get some warping on ABS or large PLA.