I am sorry for all the people having problems, but my Prusa mjni is finally just workjng and happily printing all the stuff I throw at it. Its been having issues here and there forever. I just figured out that the hotend has not been assembled correctly (heatbreaker to nozzle seal was weak) which became a greater issue when switching to a 0.25mm nozzle. Now after I fixed it, it is just awesome :)
My Mini has also been fantastic! I’ve been running it for about a year with almost no issues, primarily printing petg. Far more reliable than my last two Enders which surprised me. I also just recently upgraded my extruder, heat break and nozzle with Bondtech equipment, which has produced some great results.