Hi Thugorp. It sounds like the endstop that broke is for Z axis (up and down), yes? If so, you need to relevel the printer's platform/bed since the endstop isn't EXACTLY in the same position as the last one. If it's too far between the two, platform and extruder, to relevel to make up the new/greater distance, you can drop that new Z endstop down a bit at a time til your extruder is meeting the printbed.