Nylon strength test across 4 moisture conditions- factory-sealed spool finished second-worst

Printed 8 identical RC suspension arms in Polymaker CoPA across four conditions: straight from the factory bag, humidity-conditioned (wet), re-dried at 170°F for 6 hours, and over-dried at 170°F for 24 hours. Broke them all with a rope-and-roller pull tester. Results (normalized to re-dried as 100%): Over-dried (24h): −1.2% — statistically no damage Re-dried (6h): 100% - baseline Wet (humidity chamber): −15.7% Factory-sealed: −21.4% Soaked (sprayed directly): −33.7% The factory spool was the result I didn't expect. It got ten minutes of air exposure during respooling and was printed in a sealed enclosure. Still second-worst overall— and the widest variance of any group (27 to 39 kg across three samples). Either it absorbed moisture faster than I could protect it, or it shipped wet. I genuinely don't know which. Over-drying at 24h caused zero measurable degradation- the highest single break result in the whole test came from an over-dried arm. Has anyone else seen this kind of spread from factory-sealed spools? submitted by /u/gektor650 [link] [comments]