I have been printing with a low quality off brand PLA. I have been spending countless hours trying to fine tune the setting but I am just simply not experienced enough. I have been messing with the retraction settings and currently have it set to retract 15mm at 40mm/s. This worked slightly but still leaves mass amounts of stringing. I did a retraction test that i got off of Thingiverse.com and these were the results. Any recomendations?