【Toughness Enhanced PLA filaments with Free Build Surface】--- Our Overture PLA Professional is an advanced PLA filament with similar stiffness as regular PLA and dramatically improved fracture toughness (Charpy Impact Strength 13.4+/-1.2 kJ/m2, 5 times tougher than regular PLA). Optimized printing quality, high purity with low shrinkage and superb layer bonding, meeting your demands for printing projects of functional parts with higher toughness. Each PLA Plus spool comes with 1pc free surface | 【Clog-Free, Bubble-Free & Easy-to-use】--- Designed and Manufactured with Clog-Free patent to guarantee a smoother and more stable printing experience with Overture PLA Plus Rolls. Complete drying for 24 hours before packaging and vacuum sealed with desiccants in nylon re-sealable bag, no bubble and easy to print. Full mechanical winding and strict manual examination, to make sure the line tidy and less-tangle, so as to avoid possible snap and line breaking | 【Dimensional Accuracy & Consistency】--- Advanced CCD diameter measuring and self-adaptive control system in the manufacturing guarantee these tough PLA filaments to be strict tolerances. Diameter 1.75mm, dimensional accuracy + / - .05 mm without any exaggeration; 1 kg spool (2.2lbs) | 【Cost-effective and Wide Compatibility】--- With over 8 years’ 3D filaments R & D experience, thousands tons of filaments output every month, Overture is capable of manufacturing all kinds of filaments in large scale with premium quality, which contribute to Overture filament cost-effective and reliable for most common 3D printers, such as MK3, Ender 3, Monoprice FlashForge and more | 【LIFE-TIME GAURANTEE】No matter when or why you need to replace or refund we will help! No risk to give us a chance to prove us, overture, are your reliable 3d filaments /accessories/3d printer/3d pen supplier.