PETG poor print quality on MK3  

PETG poor print quality on MK3

Hi fellow Prusa users,

I’m relatively new to the world of 3D printing. I’ve had my printer (mk3) for around 6 months. Printing with PLA yields great results, however PETG is proving troublesome, I’m using genuine Prusa PETG filament, The main issue is with generally smaller prints being very blobby, stringing, and the scaffold seems to be tough to remove and leaves a poor surface afterwards. I’m using a 0.4mm nozzle and using the Prusa slicer recipe for that filament. I’ve tried reducing extrusion temperatures by 5 deg, and increased retraction speed, this reduces the stringing but residue and blobs still occur. I have far better results from a 0.25mm nozzle so this is puzzling me. I’ve also tried a new 0.4mm nozzle also with no improvement. Any tips or advice would be most helpful.