Why Expensive PLA Isn't Better? (Strength tests)

I put 5 PLA brands through 5 mechanical break tests - blind. Same printer,
same settings, same geometry for every spool. The results don't match the
price tags.

All prices are actual buying price in Canadian dollars (CAD).

▶ FILAMENTS TESTED
• 3D Printing Canada Budget PLA - $13/kg https://3dprintingcanada.com/products/dark-blue-budget-pla-filament-1-75mm-1kg
• eSUN PLA - $19/kg https://amzn.to/4uyJnxt
• Polymaker PLA - $25/kg https://amzn.to/4dRBgGl
• Bambu Lab PLA Basic - $30/kg https://amzn.to/4nK8Zoz
• Bambu Lab PLA Tough+ - $31/kg
• Prusament PLA - $60/kg https://amzn.to/49Ztise

▶ TESTS
• Tensile strength - dogbone pulled along the print direction
• Layer adhesion - same dogbone, rotated 90°, pulled across layers
• M3 screw pull-out - axial load until thread strips
• Warping - 100×100mm plate, no brim, smooth PEI
• Dimensional accuracy - 20×20×14mm cube + 6.35mm bit fit test

Видео Why Expensive PLA Isn't Better? (Strength tests) канала Eugene Tkachenko