Prusa I3 Pro B Frame brace with front plate

Frame Brace with Front plate.
Attention: You got about 5mm less build volume in the y axis, make sure to add this to your firmware.

I´ve also made it compatible with the anet a8 y belt tensioner because i think it looks nice :)
The belt tensioner isn´t mine, ive only remixed the belt holder/tensioner. The bolt and plate is from Audiogod.
The CTC Prusa I3 Pro B comes with a belt tensioner that uses 8mm ball bearings. The belt tensioner and the idler pulley are compatible with those parts.
Watch out! your printer should be properly calibrated before you print this thing. My printer actually printed it 1.5% smaller than it needed to be, making it unusable because it bends the y-axis rods.

UPDATE: I have improved the GT2 idler pulley, belt now stays where it should be, must be printed with supports now.

UPDATE: M4 version of the idler pulley and belt tensioner has been added. Use a 4mm drill to drill out the holes if your printer makes them too small. Don´t forget that either the M4 screw or the Idler pulley should be able to rotate freely. The screw shouldn´t be larger than 34mm. I recommend using a 30mm M4 screw.