How to make a Plarail Narrow Gauge Train

Very nice and precise work! It looks really good! I suppose the 30mm special "plarail" track is also 3D print.

Maybe the tracks come from "the Toy Train that is sold in Taiwan" at 0:55 to 1:10? At 3:20 - 3:30 you can see a line along the edge of the track that suggests it is moulded rather than printed.
 

Reminds me of a YouTuber with custom little shunters running on a Layout but can't remember who that was.

taskforce2008?