This is a coreXY printer using MGN rails. It is been optimized to get as large as possible print area in a small frame. Outer frame measurements are 290x290mm (X, Y) and print area is 170x170mm (X, Y).

Y rails are MGN9, X rail is an MGN12, Z rail is an MGW12. All carriages are the H type.

There are two styles of mounts for different idler dimensions. 8.7mm is for the normal ($1 crappy) idlers type, 10mm is for Gates style idlers. Idlers are supposed to be mounted using short 5mm pins that should be pushed in. A tricky part is that the pins in the XY parts has the be pushed in after they are mounted to the rail, the idlers will block the bolts holding it to the MGN9 carry.

This is work in progress. There is no proper solution for homing triggers. And some parts are probably missing.

Update 2020-05-23:
I'm working on a redraw using Fusion 360, most motion parts are completed. https://a360.co/2XrX3ft