FUCKING_CUNO

Ive not seen anyone try that before, but interesting idea! I do think you would probably be better served by an enclosure, however. I’m sure some thermal energy is lost from the underside, but I’d guess you’re losing more above the bed as heat rises. An enclosure would also allow you to print some more finnicky filaments that are sensitive to temperature changes during printing.

Hell ya, nice work, its always satisfying to go from idea to physical and have it work.

On top of what’s already been said, maybe try tweaking your z offset