3rd Rail CoreXY (V2 )

After a long pause, I have finally gotten around to redesigning my previous machine(https://www.thingiverse.com/thing:3094320)—and correcting a number of previous design flaws. Where the first 3rd Rail was based on the 5Rail printer, this is a fully self-made design. The advantage is that now you get the full 310x310x400 print volume PLUS the ability to use a 5015 part cooler.

Everything has been modeled in FreeCAD to ensure that belt paths are parallel.

Z rails are set inside the cube frame, which is why the cooling fan issues cropped up in the first place. If you do not intend to enclose the machine and want a bulkier cooler, you'll want to flip the Z components outside the box (you may need longer L stock for the bed mount—I cut mine long ago to fit the inset layout.)

*In theory* you should be okay using 16 tooth idlers and gears, but this was designed around 20 tooth geometry, so YMMV. If you're actually wanting to build this, I'd suggest grabbing the correct pulleys just