/diy/ - Do It Yourself

ive been printing petg for a while now. unfortunately, the brand i used for about a year went out of business. im trying various other brands, but i constantly run into one problem. i get small blobs of material in some areas of the print (im not really sure what causes them, maybe new layer start?). these blobs then rub on my cooling fan air duct (which is roughly 1,5mm above nozzle) and sometimes even move the print plate (i use both magnets and clips, if these blobs are big enough, the plate moves even with clips applied).
pic related are the blobs. i hope the quality is good enough, i marked them with yellow circles.
i know that petg has a tendency for these blobs to appear, but the previous brand i used rarely ever had this problem. this problem is also especially bad on thin wall parts.
my current retraction is set to 2mm length and 25mm/s speed (bowden setup with chineesium bondtech extruder).
im not really sure where to start with solving this problem. should i print some retraction tests? should i increase or decrease retraction settings? is this even caused by retraction?

ive been printing petg for a while now. unfortunately, the brand i used for about a year went out of business. im trying various other brands, but i constantly run into one problem. i get small blobs of material in some areas of the print (im not really sure what causes them, maybe new layer start?). these blobs then rub on my cooling fan air duct (which is roughly 1,5mm above nozzle) and sometimes even move the print plate (i use both magnets and clips, if these blobs are big enough, the plate moves even with clips applied).
pic related are the blobs. i hope the quality is good enough, i marked them with yellow circles.
i know that petg has a tendency for these blobs to appear, but the previous brand i used rarely ever had this problem. this problem is also especially bad on thin wall parts.
my current retraction is set to 2mm length and 25mm/s speed (bowden setup with chineesium bondtech extruder).
im not really sure where to start with solving this problem. should i print some retraction tests? should i increase or decrease retraction settings? is this even caused by retraction?