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For now I've attached a pic.
As you can see if I rotate the blocks, over a certain angle the edge of the block collides with the other one, is not much but enough to prevent more rotation.
I've assembled a G2s pro, and everything is ok. I can print perfectly with first extruder, but I don't understand how to bring the second nozzle level with the first one. The instructions say to loose the top nut and screw the barrel. The problem is that after a 1/4 turn the barrel of the ...