Best posts made by Fletcher

I'm seeing this too. DuetMini5+ Ethernet in SBC mode (RPi 3B+), M115 for mainboard and toolboard below:

M115
FIRMWARE_NAME: RepRapFirmware for Duet 3 Mini 5+ FIRMWARE_VERSION: 3.3beta1 ELECTRONICS: Duet 3 Mini5plus Ethernet FIRMWARE_DATE: 2021-02-14 16:24:45
M115 B121
Duet TOOL1LC firmware version 3.3beta1 (2021-02-14 16:34:04)

I left my printer sit powered on this week, and see 3 VIN undervolt events while idle. It also died again 3 hours into a 5 hour print last night. I'm happy to do whatever troubleshooting would help folks gather more info to get the root cause nailed down.

@droftarts Overnight, I had two more events:

I've tried two different PSUs and replaced 100% of the 24v wiring (before finding this thread), so I'm fairly certain it's not a power supply or wiring issue. Only remaining thing I could swap out is the 120V from the power entry module to the PSU, but this really feels like the same issue.

Good news is, I've got a build that seems to reliably generate failures every 12 hours, if you need more beta testers for firmware!

Due to the way my space is laid out, I'd need a wifi bridge (or to re-configure my SBC as a wifi bridge, I suppose) to use the Mini5 Ethernet without the SBC, so I'm down to test firmware for RRF.

@dc42 Running a print successfully as we speak, after 24hr with no issues. Thank you for your work sorting this out!