Interference fit

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Often people want to design plastic parts with an interference fit between their part and a smooth rod or other pre-existing part; or they want to custom design two plastic parts to tightly fit together with an interference fit.

Often the edge of the shaft, or the edge of hole it goes through, or both, are beveled (chamfered) to make assembly easier.

Sometimes people design the plastic part with an opening on one side, for example the Darwin/Patch or the linear bearing holders in the Holliger Y-axis Carriage Assembly, so the design can tolerate much more imprecision in the plastic 3D printer.

Further reading