I borrowed the design from LumenPnP (an OpenPnP variant), but I am honestly not impressed with their mechanical skills, so I re-designed the head. Firstly I needed a different end-sensor and added one on each side. But, the major issue was the blue belt holder that difficult to print and would not fir the belt I have + would not fit my stepper. I was also sceptical to the green middle component, but FlashForge printed that correctly.
The first LumenPnP design lacked tank-belts + it used rubber wheel on the gantries – this is now corrected as the new design is using linear bearings. I am doing a little trick on the end-sensors as I am changing to standard optical sensors that are available on AliExpress.