Modern Diesel Train
Last minute gift idea... Choose a scale factor based on available printing time!
Here's a toy train based on some of the mid-20th century diesel locomotives, especially the Fairbanks-Morse Erie Built.
I've printed this in PLA (v1 pictured) and ABS (v2 pictured), with a BIG one printed in Wood/PLA (v3 pictured).
v1 Has reduced detail, which might be preferred for a small scale.
v2 Has some extra detail added.
v3 Is big. And it requires additional wheels to be added.
The source files (modern_diesel_train.skp and modern_diesel_train_update.skp) have several "half models". Just mirror and scale. The larger portions of the model are arbitrarily scaled, so remember to shrink them down before exporting!