S42B closed loop stepper motors - No more layer shifts!
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 Published On Jul 24, 2020

If you’ve ever had a failed print from a layer shift, you know how frustrating it can be. Traditionally 3D printers use open loop stepper motors, which means if they lose steps, the printer doesn’t know and can’t compensate. The Bigtreetech S42B is a closed loop stepper motor, which means it monitors the position of the stepper and will compensate for errors. This means no more layer shift failures.

In this video, I explain closed vs open loop, examine the specifications, provide an installation guide and then test the noise, print quality and compensation back to back.

Thanks to Alan from Bigtreetech for solving the coreXY problem with stepper timing.

Purchase the Bigtreetech S42B:
Aliexpress (select which version you want): https://s.click.aliexpress.com/e/_dVyzQEN
Currently not available on Amazon.
Upgraded boards are available for this module: https://www.estechnical.co.uk/products/motion-control-pcbs?keyword=

S42B GitHub for firmware (optional), diagrams and manuals: https://github.com/bigtreetech/BIGTREETECH-S42B-V1.0

This product was purchased with my own money for the purposes of making this guide. All opinions expressed are my own.

Person outline image credit: https://www.needpix.com/photo/download/1407508/walk-icon-man-pedestrian-pictogram-traffic-human-street-footer
Traffic cone image credit: https://www.needpix.com/photo/624471/barrier-cone-attention-road-road-cone-traffic-cone-reconstruction-free-pictures-free-photos

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