Topics created by tetele

@t3p3tony said in Bed heating starting with lag:

What is the rating of the heatbed you are using?

It doesn't say. It's a 24V PCB bed that came in this kit, but I can tell you that the power draw from the mains during bed heating (according to my Gosund P1 smart power socket) is ~400-430W with a 24V PSU and a Duet-only 5V PSU. I guess it's rated at about 350-400W.

While the heater is in the initial flashing phase, is the mosfet getting noticeably warm to the touch?

Is that the one right next to the fuse and the bed heater terminal block? If so, it stays cooler than my body temperature until the bed actually starts warming up.

Another test you could try is temporarily switching the bed heater out for your extruder heater. swap the temperature controls as well and still control the bed heater as a bed. the idea is to see if it behaves the same way with a different (lower) load.

Got it. I can't do that now, but I will try soon.

Thanks for helping me debug this!

Holy crap, it seems to have worked! I soldered the capacitor flush with the board and it seems to be triggering only in the 2-4mm range. I used my 4x7mm capacitor that I had on hand, but the main thing was to make sure light does not bleed under it.

Probably that's what happened when the old one got knocked, a slit was formed under it that allowed the light to pass, even if the electrical connections were not broken.

Thanks a lot @dc42!

On first impression, switching to a glass surface made everything better, almost perfect. It created some adhesion problems, but those are easier to fix.

Thanks for your advice, guys!