@pcr Sorry for the wait but here it is:
There's a STEP file in there too in case anyone wanted to play with a solid model file.
https://cults3d.com/en/3d-model/gadget/duet3d-thermal-sensor-amp-standoff

My uSD card died so I thought I'd try the RRF configurator to speed up setup.

Heater 1 has a PT100 on it and I set up what I thought was the correct setup. RRFC spit out this line:

M305 P1 X200 R2200

It should have been:

M305 P1 X200

RRF seemed to get confused with the 'R2200' parameter. Once I removed 'R2200', the sensor worked fine.

For the moment everything else seems fine.

I’m of two minds about it. Closed loop offers intriguing possibilities but it has to be done just right to be any improvement. The biggest issue is it will cost more money, be more complicated (and more parts to fail) and it isn’t guaranteed to be an improvement. Unless you’re a big name manufacturer, add $30 per motor on your machine. I’ve even seen a few different examples where closed loop feedback made the print finish look worse.

Also, TMC drivers have eaten away some of the features once thought exclusive to closed loop.

The Maestro docs say nothing about how to turn on the 12864. I haven't actually tried "just plugging it in" but I assumed there's something to configure as it seems like everything else on Duet needs to be configured before using.

Apart from one page on how to write your own menus, this seems to be the only meaningful thing in the Maestro docs about the 12864:

The Duet 2 Maestro also support the PanelDue colour touchscreen. Connectors for a 12864-type mono graphics display and rotary encoder are also provided (these are not yet fully supported in firmware).

( https://duet3d.dozuki.com/Wiki/Duet_2_Maestro_Hardware_Overview )

I haven't actually started setting up the Maestro but I've set up a DuetWifi and DuetEthernet a year ago.

@deckingman I dug it up here: https://somei3deas.wordpress.com/2017/04/18/stepper-motor-and-electronics-cooling/

@jrdm I designed and printed one. Works surprisingly well.

I'd like to set up a Duet3 board to run a step motor in a constant RPM indefinitely (or until I request a different RPM), where I set an RPM not a distance.

If this is already available I'd appreciate a point in the right direction, I couldn't find it in the docs or the forum.

@droftarts I guess that would work but that’s more cables and connectors. I’ll weigh my options.

I could use a 3XD (3 external drivers) expansion board in my next build and I haven’t seen one available or proposed on the web.

My printer is running RRF 3.4.6 on a Duet 2.
I'm using an Orcaslicer 2 RC and it emits part names RRF doesn't like for M486 command.

The whole line:
M486 S0 A"Enclosure_Heater_Duct_for_Delta5020.stl_id_0_copy_0"

It doesn't halt printing. I haven't used part cancellation feature yet so maybe that would be a problem then.

I'm sure I can change the part names to something shorter but any chance in extending the allowed string length?

@DocTrucker Polycarbonate has good flame retardancy (V-0 and better IIRC) but easy to print grades are often heavily adulterated so you would need to check their data sheets to make sure you're getting what you want.

If it's for a regulated use you should get your parts tested to make sure the part is up to requirement. I say this because some filament manufacturers in the past have used pellet manufacturer's data rather than test actual printed coupons.

@o_lampe That's interesting. Can the second stream be interrupted?

I'd like to set up a Duet3 board to run a step motor in a constant RPM indefinitely (or until I request a different RPM), where I set an RPM not a distance.

If this is already available I'd appreciate a point in the right direction, I couldn't find it in the docs or the forum.

@dc42 OK thank you. I didn't pick up on that from the docs. I made the changes, removed my attempt at a dummy heater output. It works great now.

I have three heaters set up and in use on my 3HC. I also want to monitor and control/limit a heat break temperature to a set point. I'm using firmware 3.4.6.

I tried to set up IO output 2 as a heater but the firmware gives me a fault. I also tried to not assign it a heater and it didn't work.

I don't want an actual heater for this, I just turn on a fan if my heat break exceeds a set temperature.

With RRF 2 we used to have virtual heaters that allowed this kind of setup. Is there anything I can do? Right now I have it set up on my 6HC but I'd really love to see it on my 3HC for wiring simplicity but I seem to have run out of heater loops.

@JRDM Also 3.4.6 installs fine now too:

Firmware: RepRapFirmware for Duet 3 MB6HC 3.4.6 (2023-07-21)

@Phaedrux OK.

Also I noticed a suggestion in the SD card section to use an official SD card formatter because Windows format doesn't format the card optimally and I probably did a Windows quick format too. The docs: "DO NOT use Windows 'Quick Erase'. This generally does not create a clean FAT32 partition."

So I did that, installed 3.1.1 then installed 3.3 and it works great now. I was formatting it as you posted that so I don't know if it was one, the other or both but it works now.

Thank you.