@MartinNYHC the duet2 uses 2660 vs 5160 on the duet3. The Duet2 can use currents up to 2.8A vs the 4.5a on the 3. Most NEMA 17 steppers are fine but if you wanted to use 23s or have several large ones on the same stepper it might be an issue.
Best posts made by nriviera
Latest posts made by nriviera
RE: Duet 2 or 3 for Corexy
I have a BLV and after my Duet2 died am in the process of changing to a 3.
My suggestion is if you're not going to do a tool changer or triple-z axis then go with the 2 as the documentation is a bit easier to understand and you don't need the more powerful steppers. The other advantages are is you can get the SD card on the panelDue (and weirdly for me worked better with a long cable than the 4 pin connection). The Pi currently doesn't really give you much advantage over DWC but just boots slower. If you are considering a tool changer or multiple extruder it still works just as well provided you don't go direct drive for your heads.
On the other hand the 3 makes connecting a direct drive tool changer much easier to wire and swap out, the Pi can use high quality screens and is a touch faster with uploads once booted.
Faster trigger of M80 command with duet3 + SBC
Is there a faster was of triggering an M80 command from boot? All the power for my printer is powered through an SSR that has a bypass switch to allow the system to boot then an M80 command in the config.g keeps the power on. Before my Duet2 died this would be a quick button press but currently I need to hold power for 30s before the Pi boots. I had a config.g file on the SD card that only had an M80 and it is virtually instantaneous but then the Duet doesn't enter SBC mode.
I saw DC42 is working on allowing a panel due to switch between standalone/SBC modes which I hope will also allow a config.g to do it too.
Otherwise I'll have to wire in a USB adapter for +5v and make the printer "always" on.
Unable to update Duet3
My brand new Duet3 is doing some weird things. It powered on perfectly and connected to my SBC however the config file didn't seem to work with multiple errors showing when booting (reporting errors with commented out titles etc.) one of which was a firmware incompatibility. It clearly was communicating because I could adjust the only connected fan just fine. I had updated my DuetPi as soon as it booted the first time however the firmware was still at 3.0 Beta12 when checked with an M115. I tried to upgrade it through the web interface but it failed and said to use the BOSSA system. Unfortunately neither of my computers see the port and instead get a "unable to reset USB device" error.
RE: Very hot MCU
The ribbon carries everything (z probe, 3x fans, thermister with double ups for the hotend and each phase of the stepper). I didn't find any shorts when I tested it though.
I couldn't see them the whole way through but its cork so its hard to tell.