@Alex_Vermeer I don’t know why your parts are not sticking but I will tell you a couple important things to keep in mind while trouble shooting. First the tray and platform are not usually parallel so you need to measure the thickness of a base at all four corners of the platform to get a more accurate picture of how to set your platform height. My four squares print is good for this. Second the Helix Walls is sensItive to over compression since it has one drain hole to regulate pressure. If there is too much compression this hole comes out too small so the pressure doesn’t equalize adequately resulting in poor adhesion or blowouts.
Good to see you got your printer back in good order. I also just got my printer back, but I am not happy with the situation. But that story will be told later.