PETG filaments are made of premium PETG plastic which combines the advantages of other filaments such as safe and odorless; little shrinkage rate; high impact strength and good liquidity (flows smoothly); Furthermore, this beautiful PETG filaments make prints come out with a little "shine" or "spark" to it. 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, PETG filaments have higher extrusion temperature than that of PLA; 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 a 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: 230°C - 250°C (446?~ 482?) Heated Bed Temp: 80°C - 90°C (176?~ 194?) Filaments Diameter and Accuracy: 1.75 mm +/- 0.05 Filaments Net Weight: 1 kg (2.2 lbs) Recommended Printing Conditions: Cooling Fan: Turned on Printing Speed: 30~50(mm/s) Raft Separation Distance: 0.14(mm) Retraction Distance: 1~3 mm (Note?Based on 0.4 mm nozzle and simplify 3D V 4.0.; Printing conditions may vary with different nozzle diameters.) Packaging Included: 1 × spool of PETG filaments 1 × build surface