The modern equivalent ...
... of a watched kettle never boiling.
Courtesy of Amazon Prime a 3D printer - destined for many great things - not least, I hope camera lens adapter pieces ! I've found some "templates" for things such as M42 mounts & receivers, and Fuji-X mounts and receivers - but not yet in the _same_ template ... So there is currently a little learning curve going on in the creation, adaptation and merging of models.
The current thing that you can see going on here though, is actually a piggy-bank :-P