At wits end

Here are some parts that I printed when I first got my SD 3 ,as you can see  they look pretty good. Edges are smooth and and have well defined features.But now after the hotend that failed ( after only 2 weeks) and was replaced, I can't as hard  as I try to duplicate those parts.I did replace the jigsaw with the MK4 and new hotend ( a couple of HE actually) I have also tried several versions of RH and slic3r. I have done bed leveling ect  and all that per here on the forum and the wiki's. I just run out of ideas. All I am doing now is wasting filament.