This is a pack of all printed parts that are needed when upgrading Y axis on Anet A2/+ with MGN15 linear rail.
The belt tensioner part is a remix of Olev https://www.thingiverse.com/thing:2157807 remixed to have a parallel belt when using mgn15 rail on Y axis, and to act as a mechanical stop for the rail carrier and with fatter sides for strength and to be able to use M5 T-nuts and screws for mounting on the aluminium 2040 profile. The only piece missing is the tensioner screw that remains exactly the same and you can get from Olevs design
The motor mount is recreated from original Anet acrylic mount remixed so to have a parallel belt for mgn15.
The infill for the tensioner parts is printed at 70% but I am almost sure 40% will be more than enough.
The infill for the Motor mount is printed at 100%, because unlike tensioner is an one side mount and it needs the strength for not flexing.
What I have found out is that eventhough linear rail and original acrylic carrier works OK with pla printing, when it comes to ABS and bed temperatures at about 100c because the carrier is mounted on a small rail carriage there is a bigger leverage, springs and heat flex the acrylic bed carrier and make it very difficult to level, and that leveling changes by heat continously. It is best to replace also bed carriage from acrylic to aluminum 3mm is perfect with no flex at all.