SainSmart is an American brand that sells electronic equipment (Arduino related products, Raspberry, 3D Printer and 3D filaments). I had heard about the quality of their TPU filament sold on Amazon, but today I will test a new series of PLA and PETG filament, it is the PRO-3 Series. This series was not yet on the market when I first got it from SainSmart, but now you can already find it on their website and Amazon.  The PRO-3 is sold in a 1kg reel...