Snap-together tube joint
thingiverse
This is my first model for 3d-printing, please excuse the crudeness :D Originally part of a larger model, with multiple interconnecting tubes. I needed to print all the parts separately to allow me to remove interior support-material. This joint-design allows the parts to connect, and align perfectly concentrically. Otherwise I risk having cat-treats get stuck and a very annoyed feline :D
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