Anet A6 (may be A8), upgrade Y-Belt (inside).
thingiverse
Y-belt tensioner unit features a hidden design that keeps it within the printer's confines at all times. To manage belt tension, simply rotate the outer casing of this device. A slight modification has been made to the axis screw, reducing its length by 2 mm. For secure attachment to a printer, you'll need two screws with a 10mm head and a maximum length of 15mm. I recommend consulting designs from https://www.thingiverse.com/thing:2348612 or https://www.thingiverse.com/thing:2196720 for reference.
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