Create temperature sensitive objects on your 3D printer using this 1.75mm Color Changing PLA Filament from Monoprice! PLA is a good choice for a printing material if you are looking for high accuracy and high resolution. It extrudes at lower temperatures, does not require a heated base, and has a very low shrinkage rate (0.3%). PLA is harder than ABS, but is therefore also a bit more brittle. Additionally, PLA is a plant-based plastic, which means that it is biodegradable and gives off a slightly sweet odor, like roasting corn. The negatives of using PLA is that it is vulnerable to degradation from moisture, sunlight, and heat. Additionally, it is more prone to overheating during processing, which can cause dripping and drooping if it gets too hot. This filament is thermochromic (temperature sensitive). Under normal conditions it is a light blue color, but when exposed to heat it quickly changes to a neutral/whitish color. When exposed to freezing temperatures it changes to a brilliant blue. It comes on a 0.5kg spool and prints at temperatures between 190 ~ 220°C. Reel Dimensions: Spool Diameter: 200mm (7.87") Spool Width: 37mm (1.46") Hub Diameter: 53.5mm (2.11") Hub Width: 37mm (1.46")