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知らん。↓読んで

https://shop.prusa3d.com/en/3d-printers/181-original-prusa-i3-mk3s-3d-printer.html#

PREVENTS SHIFTED LAYERS
The new EINSY RAMBo motherboard with Trinamic drivers not only makes the MK3S silent but it also can detect skipped steps and layer shifting. This is a big step forward in the reliability of the printer and the user comfort. You can say goodbye to ugly prints!