@DC42, I have just a quick question about the recommended ratings for steppers for the Duet 2 Maestro.

I have a printer that uses the Maestro and the CoreXY steppers have the following specs.

• Rated Current = 0.7 A
• Phase Resistance = 8.8 Ohms
• Inductance = 18 mH

The Extruder steppers are:

• Rated Current = 0.45 A
• Phase Resistance = 20 Ohms
• Inductance = 24 mH

Considering this recommendation in the Wiki:

Avoid motors with rated voltage (or product of rated current and phase resistance) > 4V or inductance > 4mH.

Is it possible these motors could damage the board over time?

Thanks.

Hi Ethan,

These are things that you would change in your Duet configuration, not in S3D.

To have the hotend fan thermostatically controlled, this should be your config line for that fan.
M106 P0 S0 I0 F4 H2 L1.0 T50
Change H2 to your heater number, Set the T value to the temperature you want the fan to come on at. Set L to the fan speed you want. 1.0 is full speed.

To use 2 fans (example fans 1 and 2) as part cooling fans you link them in your Tool Setup.
M563 P0 D0 H2 F1:2 S"Extruder 1"
The F value associates those fans with the part cooling fans for that tool.

You should have a Fans section in your current config file. In the Duet Web Control click on Settings, then on the System Editor tab and click on config.g to edit it.

The Tool configuration should also be in there.

The Bridging Fan Speed Override controls the part cooling fans and is used if you set your fans on the Cooling tab in S3D to something lower than what you want for bridging. So if you set your part cooling fans to 60% you can set the Bridging Fan Speed Override to 80% for example to get a little extra cooling during bridging.

The extruder steppers (for various reasons) will stall because they don't have enough torque to push the filament. I was curious if running a stepper constantly at it's edge of torque before a stall could possibly harm the Maestro? No matter what speed you're extruding the motors get very warm. If you try and push the speed over 20mm/s (if it doesn't stall) the motors will get to hot to hold a finger on for more than a second or two and you start getting Phase Disconnected errors, which we know was (in that firmware version) a catchall error that in this case was indicating that the TMC driver was overheating and briefly shutting off to protect itself.

Not sure. I'm running 1/16 microstepping with Interpolation on and I think most are running the StealthChop with the setting D3 V0, because as soon as you leave StealthChop the steppers start squealing like crazy.

M3D Promega

Thanks for the reply.

There's a group of us that have this printer and a few of us have had components on the boards suddenly stop working. For me the extruder heater ports just stopped working out of the blue in between prints. For others one of the stepper drivers shows evidence of dying. One guy had a terrible issue with layer shifts and when he swapped boards they stopped.

So we were just curious if that high inductance under normal use conditions might put enough of a strain on the driver to cause a failure.

The thermostatically controlled fan will not change. It will be invisible and will just run any time the heater goes above the temperature you set.

The Bridging Fan Speed and any settings in S3D will only affect the part cooling fans.

You should have a Fans section in your current config file. In the Duet Web Control click on Settings, then on the System Editor tab and click on config.g to edit it.

The Tool configuration should also be in there.

The Bridging Fan Speed Override controls the part cooling fans and is used if you set your fans on the Cooling tab in S3D to something lower than what you want for bridging. So if you set your part cooling fans to 60% you can set the Bridging Fan Speed Override to 80% for example to get a little extra cooling during bridging.

Hi Ethan,

These are things that you would change in your Duet configuration, not in S3D.

To have the hotend fan thermostatically controlled, this should be your config line for that fan.
M106 P0 S0 I0 F4 H2 L1.0 T50
Change H2 to your heater number, Set the T value to the temperature you want the fan to come on at. Set L to the fan speed you want. 1.0 is full speed.

To use 2 fans (example fans 1 and 2) as part cooling fans you link them in your Tool Setup.
M563 P0 D0 H2 F1:2 S"Extruder 1"
The F value associates those fans with the part cooling fans for that tool.

@DC42, I have just a quick question about the recommended ratings for steppers for the Duet 2 Maestro.

I have a printer that uses the Maestro and the CoreXY steppers have the following specs.

• Rated Current = 0.7 A
• Phase Resistance = 8.8 Ohms
• Inductance = 18 mH

The Extruder steppers are:

• Rated Current = 0.45 A
• Phase Resistance = 20 Ohms
• Inductance = 24 mH

Considering this recommendation in the Wiki:

Avoid motors with rated voltage (or product of rated current and phase resistance) > 4V or inductance > 4mH.

Is it possible these motors could damage the board over time?

Thanks.

I've recently mounted my pi camera upside down and have found a combination of Flix X and a 180 Rotation Angle gives me the proper image, but the DWC doesn't save the Rotation Angle when I click on Apply Changes. If I refresh the web page the camera image flips back over.

Could always take the bed sheet off and probe the aluminum directly and see what you get.