Type A Machines Series 1 and U-T-O-M new style X stage with better linear bearing support.

thingiverse

This is a mod to the previously released Type Machines Series one open source files. Pictures show the production bots now inlcude a similiar change but the released files by them have not been updated. This mod is basically an adaptation of the design from pictures to incorportate the changes. The "why" behind it is that when you tension the X belt, it tends to flex the lower mounting plate making both the idler and the motor not 90 degrees to the axis and belt travel, thus the belt tends to walk to one side and rub on the pulleys. In addition, the extra tabs prevent the original Y bearing holder "ears" from flexing and thus causing minor Y slop. Basically, this is a simple mod to connect via tabs, and "box in" the X stage ends more completely adding rigidity and precision to the machine. Again, Type A machines made these mods on production units, but this is an add on for the open source.