Summary

A PTC heater that can sit inside a resin printer.
Additional parts needed:

1209 thermostat
4 x 50mm x M3 bolts
4 x 10mm x M3 bolts
PTC heaters : https://www.amazon.com/gp/product/B07VDK7HWQ
50mm x 10mm 12v fan

12v power supply

The PTC heaters are held in the center section of the heater with the 50mm bolts. I sleeved the bolts with silicone tubing.