Core XY for 3UP

Simple modification to add core XY drive to 3UP or really any Hbot printer. Print 2 each of the A and B parts, normal and reversed. You'll need two Misumi HBLFSN5-C corner brackets. Also, 4 F624ZZ flanged bearings, 4 M3X35mm screws, 2 M5x8 screws and M3 nuts (Trimcraft RC). Also a length of spacing material to sleeve up from M3 to M4 inside the bearing. I used a brass tube from KS Engineering (Ace Hardware) 5/32x.014 (3.97mm x .355mm) Stock #128. The real trick is to move one drive pulley u