Mystery solved: I used a normal office printer for the first approach, and a photo printer for the second two approaches.

Update:
(1) Nets > Maximum Faces Per Net is indeed the brute force approach: it enlarges any errors, just like an optical zoom.
(2) Nets > Nets/Paper Color Mixing > One Color Per Net/Page gives an accurate, useful print.
(3) Cutting Mode, then Shift+ Left-Click also gives an accurate, useful print.

Thanks!
Nets > Maximum Faces per Net... > 5
Worked perfectly.

How do I print one part of a net, with identical parts, for a large model? This might be [a] deleting selected parts of a net, or printing without scaling to fit the page. At present, if you reply 'cancel' to scaling down the net to fit the page, the print job is cancelled. I have tried printing a ...

Thanks very much! I thought you might be interested in some virus geometry, first on a geodesic, then as variations of the [irregular] pentagonal hexecontahedron:


https://i.postimg.cc/LYKQYzm9/Pentagonal-Polyhedral-Framework-for-Characterizing-Virus-Capsid-Structures.jpg

https://i.postimg.cc ...

https://i.postimg.cc/QFgpxdQv/Polyhedral-Construction-Of-Viruses-2.jpg

In the three-step process to convert a Snub Dodecahedron into the Irregular Pentagonal Hexecontahedron [in the picture above], how do I build pyramids on sets of identical faces [simultaneously?] so that the new pyramid-faces ...