Improved Gridfinity hotend modules A1 (mini) 2x1

Improved Version:more clearance on the tip so it also fits dirty nozzlesmore space on the back of the nozzle so left over filament does also fit → no more cutting when changing the nozzlethis version if fully stackable (on the first version the nozzles were too high → not really stackable)added notches on the stack lip so if you stack a 1x1 on top it does not slide around added chamfer so the nozzles slide in easier