Stepper motors for duet 2 maestro
-
I have a pretty good DIY 3D-printer but I still have some wierd vertical lines and I think they are caused by the cheap stepper motors I got from China. So I want to upgrade them to some better stepper motor. At the 3D-printer store where I always buy my parts and filament they only sell a set of "SL42S247A" stepper motors.
Motor specs given on the website:
Length: 47 mm
Weight: 360 g
Voltage: 3.3 V
Type: SL42S247A
Holding torque: 5 kg-cm
Nominal current: 2.5 A
Shaft diameter: 5 mm
Stepper motor format: Nema 17
Step angle: 1.8°Will this be a good motor for the Duet 2 maestro or will the current be to high?
My Duet 2 Maestro is cooled with a fan and the MCU Temperature does not go over 30°C with my current setup with 1.7A stepper motors.
-
@micheldb14 said in Stepper motors for duet 2 maestro:
Will this be a good motor for the Duet 2 maestro or will the current be to high?
no. the motors require to much current.
if you want to improve the quality of your prints, i would recommend to go with 0.9 degree steppers, especially with a corexy printer.
-
Try to find some motors with a current requirement below 2a so that when run at ~80% of the rated current they are within the Maestro limit.
As Veti says, 0.9 would be smoother in theory and allow more natural precision.
More info here: https://duet3d.dozuki.com/Wiki/Choosing_and_connecting_stepper_motors
-
Thank you for the replies. In that case I won't buy the 2.5A stepper motors and I will look for some lower amerperage steppers. The only problem I can think of is that the maximum print speed with 0.9 degree steppers is lower than 1.8 degree stepper.
My (cartesian) printer is pretty high end with a metal frame and lineair railses on all axis.
Right now I have 1.8 degree steppers with 16 microstepping with interpolation and I have done prints before at +- 300mm/s.What would be the max print speed I can get with 0.9 degree steppers?
-
@micheldb14 said in Stepper motors for duet 2 maestro:
What would be the max print speed I can get with 0.9 degree steppers?
You can use the EMF calculator here to determine your theoretical top speeds.
https://www.reprapfirmware.org/
In general though I don't think you'll notice too much of a difference. Printing at 300mm/s has other limiting factors that are likely to come into play before exceeding the motors top speed.
-
Thank you. I was searching for that calculator but I wasn't able to find it.
You are deffinently right about the speeds. most of the time the printer wont reach anything near 300mm/s but I just wanted to make sure the limit with 0.9 degre steppers did not go as low as 150-200mm/s. But I just checked the calculator and even with 0.9 degree steppers I should be able to get 300mm/s so thats a good thing. -
Would this be a good motor for the maestro?
I know the inductance should be below 4mH but that information is not given.
Should the motor be good or should I look for something els?
-
I'd be reluctant to buy a motor without knowing the inductance, but if it's sold as a 3d printing related motor it's likely OK, so I think that motor should be alright considering where it's coming from. The rest of the details are a good match for the maestro.
-
Yes it's a 3D-printer store (Reprapworld).
I will just send them a message to ask them about the inductance.
If they don't know I will just give them a try and hope for the best.
