Pipettor Connecting Nut

I found an old file while sorting through my library.

A researcher asked me if I could fix his pipettor. The only thing wrong with it was a cracked connecting nut. This was a quick fix to avoid the down-time associated with waiting for "official" parts to arrive.

The tolerances are a bit relaxed. This could be due to the overhang printing without support. Example: I printed two just pieces (sequentially). One of them fit perfectly, the other did not catch the pipettor barrel as it should h