The other issue that I am trying to work out is bed adhesion. In my ring print, there was some spots at 6 o’clock that just did not adhere. That print is in PC+, on top of PEI at what I thought was 80C. I have witnessed it getting printed on other printers no problem with the same setup.
So after fighting it for too long, I decided to try some ‘science’ - I enabled the chamber temp sensor in Marlin and used the serial output from Octoprint to see what the temp was on the top of the PEI on the glass bed.
My Eustahios is in an unfinished basement, in the same room as the water heater and boiler, it stays about 55-58F down there right now. My bed surface seems to top out at 50C after about 15 minutes of running the 800W, 120V silicone bed heater at 100C- and the bed heater reads about 10 degrees LOW, so it was really running like 110-115C. The temp readings are about as accurate as one can expect with no-name 100k 3950 thermistors on the top surface. I checked the bed surface temp with thermocouple on the multimeter and its pretty close.
How do folks contain the heat better on their heatbeds? How do we enclose the printers and not cook the motors or belts?