New Ender Tensioner

This was going to be a belt tensioner for the larger original Ender bolts/rollers, but in between starting this and completing it I bought some toothed wheels and so it fits the 5mm screws for that instead. I may remix a version for the originals in the future, the frame should have enough volume to fit it.

When I cut the new belt for my longer bed I had quite a bit of slack so the motor and tensioner were literally right at the ends as far as they could go. To compensate I have given this te