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If you use the printed T Bracket, there are a few things you need to do that are listed in the instructions to make it work.
1) The bolts that hold the belt studs, omit the nut between the bracket and the first carriage washer. The T Bracket is already thick and this extra nut will put the belt studs way offset out of the plane of the belt causing the zip ties on the belt to collide with the end pieces.
2) Due to normal printing tolerances, the inside of the T bracket will need some trimming to reach the full extension on the X axis. This area where the T bracket slides next to the end stops has a very close tolerance. You can test it by just moving the X axis all the way to each end. I had to also make sure the lock nut was aligned so an edge was parallel to the end stop edges, otherwise it would collide.
I also suggest that edge of the printed idler (the piece with bearing) that is flush with the bar be sanded. In my case normal printing tolerance added a minute amount of rough surface which kept the tension screws from aligning well. Just a little sanding fixed it and allowed it to smoothly move when tensioning the belt.