adjustable width LM8 Y-Carriage for Mendelmax with strong bearing holders

update: 11/8/13 (ish) i uploaded a picture of this mounted on my machine. when you mount it the side that printed against the bed should be up(twards the heat spreader) and the russ bot monogram should down. the top belt clamps are pretty much just guides the clamping happens on the bottom(down side)..
this is simaller to the tommy c carriage however i kept breaking off the bearing ears. so i decided to make one that used a vertically printed bearing holder. I did not include a belt tensio