Improved Y idler bracket with spring tensioner for FLSUN i3

Improved Y idler bracket with spring tensioner for FLSUN i3 that replaces the stock parts.

Redesigned the entire Y idler assembly, beefed up the parts significantly, now able to support several types of idler wheels/bearing dimmensions. Added a spring to maintain smooth tension as the Y axis moves,this eliminated most wobbling and backlashing in the axis that i was previousy experiencing.

All parts are designed in metric millimeters.

Required hardware:
M5x40 hex head screw
M3x20 hex