Basic Information:
Printer Model: DIY CORE XY
MCU / Printerboard: BIGTREETECH Octopus V1.1 32bit Control Board
Host / SBC: Raspberry Pi 4+
klippy.log
klippy.log (1.8 MB)
printer (1).cfg (4.0 KB)
Describe your issue:
Issue Summary:
Printer is shutting down with the error:
Heater extruder not heating at expected rate
despite stable temperature readings and successful power delivery tests at different power levels (e.g., 30%, 100%). The error consistently trips regardless of heater power setting or PID tuning.
Hardware:
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Hotend is a 24V 115W Upgrade Rapid Heat CHC Pro Hotend Ceramic Heating
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Thermistor: NTC 100K B3950
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Configured with sensor_type: Generic 3950
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Connected to PF4 on the MCU
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Temp readings are very stable—no spikes, no sudden drops.
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Heater is wired to PA2 (marked HE0 on the board)
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Tested with different PWM levels (e.g., 30%, 100%) — temps rise as expected
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Heater is definitely working and no signs of undersupply or power drop
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At this point, it feels like a false positive from the safety check, but I’m not sure what else to try. If anyone has seen this before or has advice on how to bypass or adjust the trip conditions without compromising safety, I’d really appreciate the help. Just want to be thorough and rule everything out before assuming it’s a firmware quirk.
