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For 5V fans you may use a 12v to 5v step-down-converter in the old 12v PSU. Same principle as before: +wire of fan directly to +5v of the step-down-converter, -wire of the fan to -fan-out on the Duet.

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xrodney
Part of lost torque can be gain by switching from 12V to 24V, but that means I need to change few things.

Any recommendation for good 24V power supply (if possible silent)? I guess 480W or so should be sufficient for everything including 200-280W heated bed and 1-2 30-40W hotends?

As for fans, any chance to run them on 12V? Description on Maestro page is a bit vague in this case mentioning 5V or VIN (24V) but also mention other voltages can be used but I am not sure how?

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dc42
Increasing driver supply voltage does not increase torque at low speeds (unless the motors have very high resistance), but does allow torque to be maintained up to higher speeds. There is a calculator to evaluate the effect of driver supply voltage at reprapfirmware.org.

If you want to run the fans at 12V you will need to supply 12V power directly to the positive fan wires. 24V fans are inexpensive.

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dc42
The 17HS19-2004 is a good choice of motor to use with the Duet WiFi/Ethernet, but 17HS19-1684 would be a better choice for most other controllers, including the Maestro and controllers using plug-in A4988 drivers. Controllers using the TMC2130 should be used with motors having an even lower current rating.

Many 3D printers run the stepper motors at only 60% of rated current, which would be 1.2A for your motors. So you would still get reasonable performance from them at 1.2A, just a bit less low-speed torque than they are capable of. At 1.4A you would be running them at 70% of rated current, which may be as high as you want to go anyway to avoid the motors getting hot.

The 1.4A current that was quoting is peak current per phase, because in 3D printing it has always been the custom to quote peak stepper motor current. The TMC datasheets all quote RMS currents. Multiply the RMS current by 1.414 to get the peak current.

HTH David

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dc42
I have run the Duet Maestro at up to 1.4A, with a 40mm fan to cool the Duet. So the maximum current you can use is comparable or perhaps just a little lower than you can use with plug-in A4988 drivers. The big advantages are that you know what current you are getting (because you set it in firmware), and the firmware warns you if the drivers are getting too hot well before they cut out and you lose steps.

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xrodney
A lower current limit for stepper drivers is a thing that's bit worries me, as my current board with a4988 driver which I believe is 1.3A seems to be on a limit to handle existing 1.68A steppers at higher speeds and I got new steppers for an upgrade that are rated at 2.0A.
Switching to 24V would probably help there but that would mean to get new PSU and all heaters at least as current ones are 12V.

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o_lampe
Two month after announcement, I just visited the fitforlaunch page again and saw the first batches are still not sold ( 22% for the 2month delivery and 17% for the 1month delivery date )
I didn't expect that!? ::o

This board doesn't meet peoples expectations it seems?
1)What are they missing?
1)WiFi
2)Stall detection/ sensorless homing
3)Beefy stepper drivers
4)A set of crimp connectors and housings ( retail package is sold out long ago or they took it from their page for unknown reasons)
5)Postage to EU to expensive?

Are there any early reviews I haven't seen here, keeping people from jumping on the train?

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o_lampe

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fitforlaunch_page
BETA TESTERS WANTED

As Duet3D and M3D are testing the boards on their own, we also have some early demo units to send to beta testers and reviewers, as well as 3D printing influencers who have experience with evaluation of technical products.

Asking explicitly for influencers leaves a foul taste ....
Although they are asked for their "true" opinion, they are more like "cheerleaders". One bad review and they never get invited again....

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fitforlaunch_page
BETA TESTERS WANTED

As Duet3D and M3D are testing the boards on their own, we also have some early demo units to send to beta testers and reviewers, as well as 3D printing influencers who have experience with evaluation of technical products.