Wizard stops at hot end after repair to destructive crash
Here is my story in brief form
Overnight print
Run 2+ hours; no problem
Went to bed
Printer went berserk, ripped partial print off bed, deeply scratched bed over entire surface
Melted fan shroud, extruder cover, extruder motor plate, extruder sensor lever, adapter printer and extruder body.
Suspect nozzle being pushed into plate caused it to plug and overheat.
Replaced all of the above parts
Tried to run setup wizard, quit without starting
Factory reset, all data
Flash firmware 3.12, successful
Self test: fans OK, XYZ Axis OK, Home OK, Bed OK,
quits at checking hot end and wants to start over.
Auto home OK
Belt test OK
Will not complete wizard, quits at hot end
Will not preheat
Will not load filament
Flash firmware 3.2 BETA, successful
Thermistor resistance is 165,000 ohms @20 C
Heater resistance is 5.4 ohms @20 C
What needs to be replaced? Help please
Have you checked the fuses?
Cheerio,
RE: Wizard stops at hot end after repair to destructive crash
What fuses? It performs many tasks except as described. The power is there. I can't find the resistance specs for the heater and thermistor so I don't know if they could be the problem. I do think the heater resistance may be out of spec. I don't know about the thermistor.
RE: Wizard stops at hot end after repair to destructive crash
All 4 fuses are good. If the heater cartridge was partially shorted out, the current would be higher than spec. 24 volts with a 5 ohm R would result in close to 5 amps (120 W) which is much higher than the 40 W specified. I can't find the factory specs to verify.
All the specs are on Prusa's Github...
For this one contact Prusa Support: Log into your Eshop account, navigate to Help and live chat is at bottom right in most browsers. If not you may need to disable your ad-blocker temporarily.
Cheerio,