Custom Mendel90 X Ends with Zip Tie holes

These are the x ends for a Mendel90 that I changed a bit.

1. Removed part of the walls that hold in the lm8uu bearings to allow them to fit in without having to heat the part with a blow dryer.

2. Added zip tie holders.

3. Added a bit more room for the bearing so its not such a tight fit.

4. On the motor end, changed the motor holes to be just tiny divots. I was having a hard time getting that 45 degree wall to print cleanly at high speed, so instead I just drill out the holes using the divots as center marks.

5. On the motor end, removed the mounts for ribbon cables because I just don't use them. Just plain old wires for me.