An expansion wedge for securing a bolt within a tube, inspired by the quill stem of a bicycle. This model is customizable for your specific dimensions. It should be printed at high density (or solid) since it is meant to be pressed between two metal nuts.

The default values will fit a 3/8" bolt and nut inside of 3/4" EMT conduit. By using an eye bolt on each end of a length of conduit, you can make a sliding curtain rod. (That's right, the entire rod, not just the curtain.)

I have 2 conduit rails hung below the ceiling of my garage, 2 gliding rods between them, and a plastic drop cloth attached with shower curtain rings. This setup gives me a fully enclosed dust curtain that I can slide in and out easily.

USE CAUTION WHEN HANGING THINGS OVERHEAD. Obviously this system will not bear loads greater than a few pounds. You might hang a utility lamp or other lightweight object but definitely do not let children play or hang on these rods.

There are of course many applications for these other than what I've described, and I'd love to hear about how you might use them!

Notes about this model:

• This design capitalizes on the fact that the two surfaces which are meant to slide against each other are those which adhere to the build plate. The flatness of the first layer reduces the friction of the interfacing parts.

• The center hole is slightly flared to accommodate angular deflection when wedged. So it may appear ovalized and feel wobbly but this is desired.

• In Customizer, the units are in terms of diameter (not radius) since the typical scenario would be someone measuring their actual application's dimensions using a caliper.

• I can't believe this thing wasn't here already.