fischertechnik screw snail with gear

I have designed a fischertechnik srew from one piece.
At 0.1 mm resolution, the game is the same as the original. At 0.2mm it is a little heavily because there is almost no game.
So that it can be printed without raft I have added a 20 gear.
Inside is a 4mm fischertechnik shaft. Without this, the screw is not stable.
The transition between the gear wheel and the screw is a fracture point. Caution when removing the pressure bed.
I have printed the snail up to 30cm. From 25 cm it became somew