I have a project where I would like to model something corrugated pipe similar to an agricultural drainage tile. I have found a reference to nSpline, and an example that looks like a piece of rebar tied in a knot (see image 4): https://www.thingiverse.com/thing:1208001 Does anyone example of flexible calendars or pipes? Otherwise, I will start playing with nSpline to see if I can generate what I need. Thanks, EBo --