Decided that a spare hot end should be on hand so ordered one from China. Takes a while to get by which time my current hot end has become clogged. I need that spare. I go to install it so I can clean the original and ALAS it is a 3mm hot end not a 1.75mm! Doop. Have had great luck working with vendors in China so am sure I will get this resolved but the timing is a challenge.