WARNING (2021.03): New versions of the printers have improved coreXY geometry (pulleys side is perfect, motors side is still about 3 mm from ideal). Check your printer before modifying.
This is Two Trees Sapphire Pro 3D printer CoreXY geometry fix with original parts.
I fixed it in one evening. Some drilling, tapping and grinding, now the belts are parallel to the rails. The top plate is aluminum, so processing is very easy. Unfortunately, I have a regular tap, so I had to drill through holes, but in the end I sealed them with black silicone. It's sad that you need to improve the manufacturer in this way, but it is the only way.
You need:
Drill with 3.2 and 4.2mm drills
M4 and M5 taps
Angle grinder for cutting in stepper motor mounts.
Some time...
Dimensions are shown in the pictures. You can use attached sheet to drill new holes for motor mount.
| motor_mount_sheet.stl | 30.7KB |
