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This does not work with a 2017 acrylic frame. The thingy frame arms are too thick & far apart. Filing them down weakens them to the point where they break under tension. Resizing frames does not work.

But I used these instead: https://www.thingiverse.com/thing:2051259 and rezized the bolt and plate from this thingy to 90% and 91% respectively (drill out screw holes to fit)

Anet A6 New 2017 Y-Belt tensioner holder resized