Stepper Choices for 300x300x365mm Corexy, with Duet 3

  • I am looking for a setup capable of excellent performance, but that can be run as near to silent as possible.

    As I run through the stepper options, I am getting caught in a bit a do loop. Inductance limits on the speed end, torque on the acceleration end, and I am not sure where the sweet spot lies.

    The extruder will be a BMG, hotend a V6 weight class unit.

    Z is a NEMA 23 on a 30:1 gear, a la UMMD, so torque isn’t so much of an issue.

    I have drawn up a short list from the Moons 0.9 degree offerings. I am open to alternatives that will be as good as or better (performance and noise-wise) than these.

    Any thoughts?62184A27-DC4B-4A95-B6CE-C1A9F2C0A388.jpeg 6E6B17C3-9E4E-4A82-B4E0-D937E0FC1360.jpeg F2BEB62B-9AD3-46A8-87C1-686B4E766D1D.jpeg

  • I have not read your chart in detail... so forgive if you've already looked at these.

    Many people in the Jubilee group (CoreXY toolchanger) are switching to these for XY:



  • Very interesting - thank you.

    Do you think these will perform as well or better than the Moons?

    I wasn’t sure if people were switching from Moons or other makes.

    The 42STH25-1404MAC looks like a good pancake extruder option - LDO which is OEMed by Bondtech.

    Edit seems like the guys on the Prusa VFA megathread had various issues with the LDO pancake extruder motor.

  • The people who've already received them seem to think they are "noticeably" quieter and measurably cooler at the same current settings, as vs stepperonline 17HM19-2004S or 17HM19-2004S1

    So some anecdotal and some measurable; all told people are liking them.

  • Very interesting. Thank you very much.

  • @Doppler9000 @Danal said in Stepper Choices for 300x300x365mm Corexy, with Duet 3:


    I have the 17HM19-2004S in the X Y stage. I run them at 1600 mA. They work quietly and have plenty of torque to throw around UMMD's 1.5 kg X axis. They only get slightly warm to touch, but they're on aluminum mounts. I think when I'm running a long ABS print with the printer closed and heated to 50C the machine's frame transfers more heat to the motors than they transfer to the frame.

    Keep in mind that noise is not just a function of motor/speed/current. If you set acceleration and jerk to maximize print quality, you'll hear a sort of bumping sound every time the mechanism changes direction. At very high speeds (>200-300 mm/s) the toothed belts contacting smooth pulleys make a zip-zip sound that can be eliminated by twisting the belts so the smooth sides contact the pulleys. At more normal speeds it isn't really a problem.

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