This is a sample print using the Terrain2STL site here: http://jthatch.com/Terrain2STL/

Site parameters were NW corner at (38.8898 N, -77.0752 E), box width 0.05 degrees, box height 0.03 degrees, vertical scaling 4.  Other parameters as default.

The dataset appears to be 90m from approximately 2000 AD using the SRTM3 dataset.

Compare with the other terrain model: https://www.printables.com/model/292511-topographic-tutorial-pentagon-area

Attribution: Terrain2STL web link credits the creator

Data set attribution: https://cgiarcsi.community/data/srtm-90m-digital-elevation-database-v4-1/ for the location of the dataset hosting, original data from NASA.