Comment on Biqu B1 - Not heating the hotend
morbidcactus@lemmy.ca 3 months agoHonestly $80 sounds like an absolute bargain, you straight up can’t build one yourself for that price, a mainboard and like 2-3 steppers would go over that and everything I’ve seen about that printer says it’s a very capable, budget friendly option. It looks like that’s using a btt mainboard which I totally swear by, straight up shorted a fan header on an octopus pro and it’s still chugging along just fine, anecdotally they’re pretty hard to kill.
I’d totally check your wiring before replacing a board, a break or bad crimp could totally be your culprit here, and those are a heck of a lot less work to remedy, thermal protection does totally get tripped if there’s an intermittent fault with the thermistor (including cabling), I had it happen on a prusa where it’d kick out but not have anything obvious temp wise on the display, only noticeable in a temp plot.
UncleStewart@sh.itjust.works 3 months ago
The thermistor temperature reacts to me touching the thermistor-end. This shows in the display- So i believe this is not the problem here…
morbidcactus@lemmy.ca 3 months ago
Fair, a wire break can be annoying though, often they’re intermittent, and the display often doesn’t respond fast enough to show that, but thermal protection will.
I’d totally consider taking a look at the connectors to the board for the heater cartridge, see if there’s good contact being made, check for any signs of things like scorching check end-end continuity. Looking at the schematics for that mainboard Btt skr 1.4 it looks like there are LEDs on all of the MOSFETs, it will give you a visual indicator of the board state, to help narrow down your troubleshooting.
UncleStewart@sh.itjust.works 3 months ago
Thanks for the links. Can’t see any scorching, and everything I’ve measured seems OK. If there are LED’s on the mainboard, i don’t know how to light them. As of now there are no lights on the motherboard, but everything beyond that heater works…