Good thing, great work was done for creation of this one. But position of axis of puley is different that on the original frames. I made custom belt holder and with original frame belt was perfectly parallel, but than I made this tensioner and belt tilt was appear. Cause of this is view on second picture - hole for pulley's screw is a bit higher. This has no effect for normal work (I am mainaly printing on the near left corner of bed), but may be affect for big printed things.