Prusa MK3/S/S+ Y-Axis Linear Rail Guide Remix

It's a remix of KanneKnall mod

• Added a center support on each side
• on the right rail, I left 0.25mm of play on each side to allow it to find its place. I thought the original design was over constrained and could lead to misalignment.
• Rear support now received T-Nuts instead of nylon nuts. It allow a better distribution of the force when you tighten your rail and prevents the walls from deteriorating and leads to the nuts turning freely (got this 2 time with original design and it was a PITA to disassemble after that)
• There are also 2 holes that you can use if you want add a squash feet on the right side but haven't made the design for now.