Description:These 1.75mm PLA filaments are made of premium PLA material (Polylactic Acid), which boasts complete biodegradation and lower melting temperature, even does not need a heated bed, eco-friendly and safe, with no odor during the printing Buy with Confidence, 100% Satisfaction Guarantee. E-mail us if you have any issues or questions, we will make every effort to provide you with immediate help until you are satisfied. FAQs:Why can't the filaments stick to the build bed?1. Check the temperature setting before printing, PLA filaments have lower extrusion temperature;2. Check if the plate surface has been used for a long time, it is recommended to replace it with our new one to ensure an strong first layer adhesion;3. If the first layer has poor adhesion, it is recommended to re-level the print substrate to reduce the distance between the nozzle and the surface plate;4. If the effect is not good, it is recommended to try printing the draft before printing. Specification: Temperature Recommended Extrusion/Nozzle Temp: 190°C - 220°C (374?~ 428?)?Heated Bed Temp: 25°C - 60°C (77?~ 140?)Filaments Diameter and Accuracy: 1.75 mm +/- 0.02 Filaments Net Weight: 1 kg (2.2 lbs) Packaging Included:1 × spool of PLA filaments