Tronxy X3 bed support redux

FANTASTIC original design by kencam is here: http://www.thingiverse.com/thing:2185364

The original design meant re-orienting the Y axis belt, and doing additional printing to accommodate the change, I just wanted to keep the 2020 Y section in place, still eliminate the rollers, and do the most minimal amount of printing possible to add the 400mm rails.
I shaved off the belt lock from the original design, and raised the rod holders to allow the bed to sit above the Y axis aluminum. You lose a