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Bondtech drive door has pocket for M3S square nut. Clear out the overhangs completely.

Bondtech shaft must be inserted in direction illustrated. It will not fit from other side. Fully seat the shaft.

M3 x 12 mm filament sensor adjust screw directly threads into plastic of idler door. This is used to adjust internal filament sensor system. For now, advance its tip to just flush with inside surface of idler door.

Filament sensor adjust screw is only used with MMU2S, but it is reasonable to install one now in case of later change to MMU2S

User, AnatomicFlack suggests rounded reshaping tip of sensor adjust screw to produce more linear adjustment response.

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