HO scale model of an old transformer station building located in Galt (now Cambridge), Ontario.

https://maps.app.goo.gl/mg3BNbDGqhKZo3RG7

Two of these buildings survive: one at the corner of Cedar Street and Grand Avenue South, and one in the middle of the block behind Water Street North and Park Hill Road. The two brick structures are pretty much the same, but each building has different rooftop ventilators and conduit connections through the walls. I photographed and measured the building at Cedar and Grand for this project.

The main part of the model prints as a single structure with interior brick detail. My interior brick work and the roof trusses are just guesses but they seem reasonable to me.

Print two of each door and assemble the doors back-to-back to provide interior detail.

Print two of each roof truss and assemble them back-to-back. The roof trusses pop into recesses in the side walls.

There are two options for the wall vents:

• Print 12 of the empty frames and assemble them back-to-back, sandwiching your preferred mesh material between the frames. For the mesh, use fine veil material or photoetched mesh. I have used the mesh created by print rafts for this an it works well.

• Or, print 12 of the frames with grille and assemble them back-to-back. Printed with 0.1mm layers with a 0.2mm extruder, the vents look pretty good.

Print the ventilator and conduit shrouds with 0.1mm layers and a 0.2mm extruder. The assembled ventilator will actually ventilate! Use the circles on the back wall to locate the conduit shrouds. On the real building, these appear to be glazed ceramic castings, similar in appearance to old electrical insulators.

UPDATES

September 25, 2024:

• Updated GTS_Building.stl to repair minor "open facet" errors reported by slicer.

• Updated GTS_Roof_Truss.stl to set the correct width for the part. Print as-is and it should pop into the recesses in the walls.

• Updated GTS_Conduit_Shroud.stl to make the walls thicker for better print results. Print with 0.1mm layers and 0.2mm extruder. I print these with a brim.

• Added GTS_Wall_Vent_with_Grille_Half.stl to provide printed mesh for the wall vents. Print with 0.1mm layers with 0.2mm extruder. I print these with a brim.

• Changed filename of GTS_Wall_Vent_Frame_Half.stl. Use this empty frame if you want to provide your own mesh material for the wall vents.