This is a remix of the Y-axis Front End Plate for the Makerfarm Prusa 10" i3v printer.This is much easier to adjust the tension than the previous version.
You will need to change the 2-M5x12mm bolts to 2-M5x20mm bolts to connect the V-Slot. I used an M5x35mm screw and Nut for the screw that tightens the belt tensioner. If your belt is not too short, you could probably use a bit shorter screw. In designing this it looked like the screw would miss the belt, but after printing it seemed pretty close for a longer screw. I did make the gap another 1mm bigger for what I am uploading.
I used an M5x25mm screw with locknut to hold the idler in place. I used the plastic pin M5x9_6mm.stl to position the split idler assembly in place & then pushed M5x25mm screw thru pushing the plastic pin out while the screw went thru the assembly. There are 3 photos showing how that was done. I also used 2 plastic M5 washers instead of metal ones, but you can use metal ones if you want. The plastic ones are M5x10mmx1mm_4x_Washer.stl
I printed these at 40% infill using the gyroid infill of the Slic3r Prusa Edition. I added the disc20_4x.stl to the wide print of the Y-Axis_FrontPlateSlideBracket_10_Rev43.stl. I add as a separate part rather than combining to the front plate as it seems to cut off easier for me.
This front plate does not flex at all now.