I am working here and there at seeing how well I can use 3D printing to create the shell for O scale engines based on HO mechanisms. Sure .. this has been done countless times in the past .. in fact it is the basis of On30.

SD-40-2 Mechanism

Placeholder Just leaving this here until I find out which mechanism I have to play with. It belongs to a friend, Andrew Gillette. He TOLD me .. just forgot since. Some Sketchuping This is my working model(s) around the SD40-2 mechanism. I have basically copied the inside of the HO body where it fits around...

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