telescoping

This is an attempt to make a series of interlocking telescoping tubes in a single print. In particular, this demo creates a model consisting of three interlocking tubes, which can be extended outward, but cannot be separated. See Whip antenna.

To allow printing on an FDM printer, the notches in the tubes are triangular, extending at a 45 degree angle, to avoid the need for supports.

Rendering

Here is a rendering of the first attempt: