PC4-M10 fitting and tube work very well but filament always gets stuck in PC4-M6 unless it is perfectly straight like Bowden. The tubes are 2mm in diameter, but the fitting has a slightly larger hex hole than 1.75mm, creating a burr inside for the filament to get stuck in. If the filament doesn't get stuck, the brass will scratch the filament and create thin loops of filament that will build up in the tube. I gave 3 stars because I didn't buy this for M6 fittings but if I needed them I would give 2 stars. I'm sure they work great for their intended purpose as pneumatic fittings, but they aren't 3D printable.
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