First I printed the remix from JWS and saw that the filament doesn't even touch the ball bearing 99% of the time.

Than i thought I that it can be much smaller without the ball bearing part.
While changing that i did some other modifications.

Like bringing the mounting holes more towards the case it self, making the extra material smaller or removing some of it.
Made the holes a bit bigger to put PTFE tubes in it. Top and bottom are big enough but I only put one to the top, where most of the friction will be.

Also made a lid with a ball bearing on it, which it doesn't need anymore ^^

All in all it prints faster and easier, its smaller, you can fit PTFE tubing on both sides and has it a lid.