This is a simple clamp to prevent 4mm Teflon tubes from sliding in and out of boxes or printer enclosures. Avoid printing it with materials that creep (permanently deform under load) easily.
The author remixed this model.

This is version 2 of the Teflon tube stop. The innitial gap of the clamp lock is a bit bigger, so that there is a bit more tension, in case the materials creeps a tiny bit.