3DPrinting
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What you’re seeing is the smaller inner diameter of the dark blue Capricorn. The light blue Capricorn would be similar to your current tubing.
and even if it were worn down that much it wouldn't cause any problem as the entire tube is made of the same slippery stuff, it's not a coating.
Would a larger inner diameter not cause the transmission of movement to be less direct due to bending and coiling inside the tube? This is probably mostly an issue in bowden systems
on a bowden system yes, but just ever so slightly. not any more than you could fix with retraction and other settings, and prolly only nylon and other flexible ones you should be doing in a direct dirve anyway would be affected.