The fumes can still be pretty bad. Both filaments are safe to print inside your home and while the fumes can smell pretty bad, they’re not classed as carcinogenic. Print quality is done using a CNET calibration test that I use to test all of the 3D printers I review. Winding precision is a visual test where I check to make sure the filament works well on the spool, without any crossovers that can cause snags while printing.