When it’s PLA, of course ... 11 mm in diameter and at least 5 in long. Happily, 3D printers exist for the sole purpose of turning 1.75 mm filament into other shapes and sizes.

Total Length: 410-425m. Full 1KG 3D printer filament reel, perfect roundness and very tight diameter tolerance, good winding, does not overlap or tangle. Melt well, feed smoothly and constantly ...