Anet A9 X & Y axis tensioners

thingiverse

Anet was woefully lacking in its A9 design, particularly on the y axis tensioner. The belt consistently rode up, causing waves in my prints due to the puller's placement at the bottom of the bolt only. Meanwhile, the x axis had no real tensioner at all. I managed to find an Ender 3 x axis tensioner on Thingiverse that worked reasonably well, but there was nothing available for the y axis, so I designed one myself using tinkercad. Both the X and Y axis tensioners are included here. The X axis can print well without any support, but the Y axis requires it to print successfully. The holes I configured for mounting this to the base were in the correct locations, but I made them too small and needed to enlarge them with a round file. All parts are strongest at 80% infill and still manage to print quickly. Nuts and bolts will be necessary, but I was able to reuse what fit, including the bearings. During installation, I discovered that the gt2 timing belts were of extremely poor quality (vinyl). As such, I purchased five meters of RUBBER gt2 6mm belt and replaced them. It's unacceptable that my $85 101hero came with rubber belts, yet these didn't meet even those basic standards.