Considering a Duet: Could Use Some Insight (UMO)
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@arhi : DueUI might work for you. I did not see an APK at the latest release assets, but Ik am site you will get one when you ask for it.
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@DaBit already using dueui, I would not recommend it to ccs86 otherwise
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@CCS86
The Duet 2 Wifi doesn't offer direct support for the PT1000 sensor?
Er yes the Duet Wifi does offer full native support for a PT1000 without any other hardware! -
@Dougal1957 said in Considering a Duet: Could Use Some Insight (UMO):
@CCS86
The Duet 2 Wifi doesn't offer direct support for the PT1000 sensor?
Er yes the Duet Wifi does offer full native support for a PT1000 without any other hardware!Thanks!
They should update this page:
https://duet3d.dozuki.com/Wiki/Comparison_of_Duets_vs._other_32-bit_controller_boards
It is mentioned specifically for the Maestro and Duet 3, but not mentioned for the Duet 2 Wifi/Wired
Also, on this page: https://duet3d.dozuki.com/Wiki/The_Duet_family_of_motion_control_electronics
It says that it will work with the PT1000, but with "reduced accuracy". That's not as exciting.
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The Maestro has the following limitations compared to the WiFi/Ethernet:
- Stepper drivers limited to 1.6A vs. 2.4A
- No stall detection
- Limited expansion, basically 2 more stepper drivers + a few GPIO pins
- Available only in Ethernet version
- Slightly less powerful processor, in particular no hardware floating point
It has the following advantages:
- Drivers support stealthChop, so quieter if you print slowly (stealthChop is not recommended for high speeds)
- Supports low-cost RepRapDiscount LCD as an alternative to PanelDue
- Easier wiring of BLTouch probes
- Thermistor inputs optimised for PT1000 sensors (but a little less good for high-temperature thermistors)
So if you don't need more expansion, and 1.6A current is enough for your motors (it's enough for almost all Nema 17 motors), and you are not running a Polar or SCARA printer that especially benefits from hardware floating point, then the Maestro is adequate and costs less.
HTH David
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@dc42 said in Considering a Duet: Could Use Some Insight (UMO):
The Maestro has the following limitations compared to the WiFi/Ethernet:
- Stepper drivers limited to 1.6A vs. 2.4A
- No stall detection
- Limited expansion, basically 2 more stepper drivers + a few GPIO pins
- Available only in Ethernet version
- Slightly less powerful processor, in particular no hardware floating point
It has the following advantages:
- Drivers support stealthChop, so quieter if you print slowly (stealthChop is not recommended for high speeds)
- Supports low-cost RepRapDiscount LCD as an alternative to PanelDue
- Easier wiring of BLTouch probes
So if you don't need more expansion, and 1.6A current is enough for your motors (it's enough for almost all Nema 17 motors), and you are not running a Polar or SCARA printer that especially benefits from hardware floating point, then the Maestro is adequate and costs less.
HTH David
Thanks again David!
The technical differences and real world interpretation are just what I was looking for.
What would you say the speed limitation of stealth chop 2 is? And what happens when you exceed this? (Skipped steps, resonance?)
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@CCS86 said in Considering a Duet: Could Use Some Insight (UMO):
What would you say the speed limitation of stealth chop 2 is? And what happens when you exceed this? (Skipped steps, resonance?)
In my experience, the issue is skipped steps. That's what I experienced occasionally when I switched my Maestro-powered Ormerod printer from spreadCycle to permanent stealthChop.
The maximum safe speed for stealthChop will depend on your steps/mm and you motors, but I think it would typically be between 50mm/sec and 100mm/sec.
To counter this limitation, the drivers are normally programmed to switch from stealthChop at low speeds to spreadCycle at high speeds. The snag is that when it switches over, you get a slight motor jerk. The higher the speed, the worse this jerk is. You don't want a large jerk to happen during printing. This leads to two possible settings:
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Set the drivers to switch over to spreadCycle at a low speed. So they will be in stealthChop mode when idle and at very low speeds, but mostly in spreadCycle during printing. This is the default in RepRapFirmware.
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Set them to switch over at a speed higher than your highest printing speed, so that they only use spreadCycle during fast travel moves. Or, if you limit the travel speed, they will always be in stealthChop mode. This may be what the Prusa i3 it does in "slow and quiet" printing mode.
HTH David
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Thanks David,
I tend to print mostly under 50 mm/s. If I ever went higher, it would be for infil moves, where a slight jerk for a mode change shouldn't be a big deal.
In regards to the 1.6 amp max current, I am running these steppers to drive X and Y: https://www.omc-stepperonline.com/nema-17-bipolar-0-9deg-46ncm-65-1oz-in-2a-2-9v-42x42x48mm-4-wires.html
They are rated at 2.0 amps. I highly doubt that my Ultimaker Original board is driving them anywhere near 2.0 amps. For a very light print, bowden print head there wouldn't be any issues at that 1.6 amp limit on the Maestro, right?
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2.0A motors is higher than I would recommend for a Maestro, however 60% of rated current is often enough, and some printers use as low as 50%. So a current setting between 1.2A and 1.4A should work. As you said, I suspect that the existing board drives them at much less than 2A.
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Well, I pulled the trigger on the Maestro!
Thanks again for the help everybody!