Protopasta Carbon Fiber PLA 3D Printer Filament 1.75mm - 500g Spool for High-Strength Prototypes & Functional Parts - Perfect for Engineering, Automotive and DIY Projects

My search for a filament that boasts strength, heat resistance, and a nice finish led me to this filament and I wasn't disappointed. While I'm still just beyond the point of testing how far its heat resistance can go over different periods of time, I've already found myself satisfied and even impressed by this product.Heat Resistance:As I was heat treating it in an oven, it appeared to keep its shape until I cranked the oven up to 200+F which is most impressive. It's worth noting that the recommended heat is roughly 225-230F for heat treating this filament which does manage to cause a slight bit of warping/shrinking, but it's barely noticeable and can be managed through using weights or by heat treating it in shorter stretches.Finish and Strength:On top of some already impressive heat test results, the finish on this is the best I've seen on any filament I've printed. There are absolutely no signs of layer lines in the second print I did (the first photo) with absolutely no sanding required. The overall feel is lightweight, yet extremely solid. I brought the the initial test (second photo) with me to work and used it as a stress ball the entire day trying to break it, and it didn't break. It wasn't until that evening when I got home when it finally broke, after I put my full weight into it while I was waiting for it to finish curing after the heat treatment.Print Settings:As far as print settings go, I was able to print this on my upgraded CR-10 with a nozzle temperature of 230c (225c in the second picture, 230 yielded better results), a bed temperature of 60c, and a movement speed of 50-60mm/s. The level of difficulty for printing this is slightly advanced and I would recommend an upgraded extruder and hotend for this. Also, please be sure to print any carbon fiber filaments in an environment that is well ventilated.For more information on this filament, you can check out the filament profile on the manufacturer's website OR in the Filament Database on Indisposable3D's website.