@o_lampe my test was at Z10, as was that done by @achrn. It's not the shape at the top we are concerned with here, it’s that it goes beyond M665 B parameter. The cone at the top is limited by the endstop switches, so I’m pretty sure the firmware takes account of that, though I didn’t test that. It’s why you always have to move down in Z after homing, before moving in X and Y. okay, rereading @achrn’s post, it’s trying to go outside the cone at the top too. I’ll update the issue on GitHub.
Ian