Improved rebelix x axis end with tensioning

IT WORKS! I am successfully printing with tensioned everything :D

I was tired of the stock x end not being able to hold the x belt tensioned at all. First i put a ziptie on it, then i designed and printed this.
It takes one m5 around 25mm long with hex head, one nut and maybe a washer.

V1.1 the endstop mounting holes did not line up with the z home adjusting screw.

V2 x-motor is now narrower, so it doesn't eat up printvolume. x-end has a bigger 6mm hole for the m5 screw. (if it's too