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Print in flexible material. for diameter 1" & 0.060" (25.4mm, 1.5mm) thick steel tube often used for poles on trampolines.

I used 1.5mm2 cable through it but use any type of cord that will fit...

Use many layers when printing to get a strong part.

I used my own TPU filament material but it contained lots of moisture thus the rough surface on the picture...