For this mod, you don't have to change the firmware and you don't loose print height.
I used 2 x 400mm mgn12 Linear rails
and 3 x mgn12 Bocks
I had to take apart all blocks. clean it and put new grease in it.
But i knew that before. so, no surpise.
i think, these rails and blocks are ok.
update 1
Added STEP-files
update 2
Added rail calibration tool
Category: 3D Printer PartsThe author marked this model as their own original creation. Imported from Thingiverse.