Similar issue; brand new v3 Dual, haven’t successfully printed the “impossible gears” on 4th attempt.
1st attempt: Printer halted with “Heating failed E1” after 10-15 layers. Noted intermittent sizzling and bubbling of the provided poly dissolve; my first time with it, so not sure what is expected.
2nd attempt: I’ll call it my fault, I de-activated and then re-activated the generate support option; when it attempted to build gear, it started to create spaghetti, print halt. Bug in CURA?
On 3rd attempt, I got
“Err: MINTEMP E0
when powering up; that happened twice, I re-seated the 2nd extruder cable to power unit and the connectors to the print head. System powered up and I loaded up a spool PolyDissolve, it appears different than the sample filament provided with the dual extruder. I ran the print, but continued to notice sizzling and popping of the PolyDissolve and what it was laying down was “bubbly” I let it run a bit, when it started to do the infill for the gear “shafts” it tried building a bird’s nest, I attempted to pause to clean it up because it was a very small amount, but that failed, so I aborted. I did note the display read temperature jumping around. While it was cooling, I touched the harnesses on the print head and the temperature would jump around on the display.
4th attempt: bubbled and sizzled and smoked the PolyDissolve, the extruder temperature jumped around and hit 260C at which point I aborted. After aborting, extruder 1 (left) maintained 170C but extruder 2 showed setting 0, so I terminated heating.
Time for a call to support.