Unfortunately, most of those PTFE tubes have been good. There was warp on 1/3 of a long piece of tubing I cut for my Delta printer. Luckily I bought this length as I was planning on saving just over half for future projects so I was able to get a good chunk out of that half for immediate use. Just make sure you cut every length of thread that can actually go through your pipe without getting stuck. It's easier to figure this out before you install it and wrap all your cables around the pipe, only to find that it gets stuck halfway through that deformation. The outside diameter of the affected area showed no visible signs of damage. But upon closer inspection you can see that the I/D has some residue left over from the manufacturing process. Unfortunately, this blockage prevents the passage of the thread. I will contact the manufacturer for a replacement.
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