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  1. #1
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    Closed Loop Driver Discussion

    Hello. I have a large format CoreXY printer I am nearing completion on and have decided at the last possible second I want to finally experience the wonderous world of closed loop stepper motors. At least on 3 motors. X, Y, and E. I have been doing my research as I understand it in an effort to find out which is the best driver I can get today. So far I have found 2 contenders I am on the fence between. There is the BTT S42B v2.0 here:
    https://www.biqu.equipment/collections/stepper-motor-board/products/bigtreetech-s42b-v1-0-closed-loop-driver-control-board-42-stepper-motor-oled-3d-printer-parts?variant=31978068639842
    And there is the MKS SERVO42B here: https://www.amazon.com/Entweg-Stepper-Printer-Servo42B-Display/dp/B08H5K5DZQ/ref=sr_1_3?dchild=1&gclid=Cj0KCQjw0oCDBhCPARIsAII3 C_H5hUahTfen0BdzJE9yDuJMiNAJdQgaEnEqo2zebquhcm-TdyELQL0aAlkfEALw_wcB&hvadid=499767353181&hvdev=c& hvlocphy=9011888&hvnetw=g&hvqmt=e&hvrand=255779324 9470328539&hvtargid=kwd-924687306703&hydadcr=8715_11330848&keywords=mks+se rvo42b&qid=1616973132&sr=8-3 .
    They both are driven by STM chips but one has A4950T drivers, the other has A4954lpt and opposite to which we would think is the better of those two one has a TLE5012 angle sensor and the other has a A1333LLETR-T angle sensor. Looking at specs these are very close with tradeoffs either way. Does anybody out there have any real world experience with these or any other silent closed loop drivers maybe TMC driven? For a 42mm stepper motor.

  2. #2
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    I found this video so far. I am still looking for more information or direct comparisons between the latest version of these closed loop drivers and the TMC2226 drivers.

    S42B closed loop stepper motors - No more layer shifts! - YouTube

  3. #3
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    Here is a short video on the ones I am looking at from the manufacturer.

    BTT S42B V2.0: Not easy to lose step in high speed and provides users with more chance to DIY. - YouTube

  4. #4
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  5. #5
    Super Moderator curious aardvark's Avatar
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    interesting - it's pretty much what the prusa mini does from firmware - but more reliable lol.

    Although I have to admit I can't recall having a single layer shift error since I had a loose drive gear on my delta.
    Never had it from any of the other machines.

    But pretty impressive and fairly cheap too :-)

    So it basically turns a standard stepper motor into a servo motor.

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