This is a CoreXY based printer I designed and built. Probobly not the cheapest or best one on here, but hey, it looks pretty.

7/24/19 - Updates:
I added an updated STEP file, but did not convert the files to STL. If you intended to build this, open the assembly up in a CAD program so you can see how it goes together and convert the printable files to STL.
Bed is no longer cantilevered (should be a little easier to build)
Changed to direct drive extruder. Current design uses Bondtech BMG (Fancy stuff)
Board upgraded to Duet 2 wifi, with the smaller panel due.
BLtouch bed level sensor
Had to switch to a microswitch for the X limit switch, but if you are using the Duet Wifi, you dont even need limit switches.

Features:
BLtouch ABL probe
Duet 2 wifi w/ panel due
Direct drive or Bowden designs.
MGN12H profile rails (linear guides) for all axis
9MM GT2 belts for the CoreXY system
T8x2mm lead screw for Z
84oz NEMA 17 Steppers for XYZ axis
Fully enclosed - I used ABS and Acrylic, but mostly because I had a bunch of ABS (other materials would probably be cheaper)
2020 frame
Most components use 2020 hammer nuts or thread forming screws