I work part time at Canada’s oldest hobby shop in Halifax. My coworker 3-D printed our famous Peggy’s Cove Lighthouse in HO scale for me at the shop. I assembled and painted it, then installed a working light by building an electric circuit using a 555 timer chip and transistor. It was amazing to watch it print out. Took about 5 hours for the main parts.
Here is a short video of the lighthouse being printed. It is about halfway through making the main parts.
https://youtu.be/RBTrAJbRm38