Modern O27 Freight Car Trucks
thingiverse
Here is a modern freight car truck that is sized to fit Lionel O27 trains (and compatibles). Print oriented as shown with tree-type supports. The side frames press-fit into the bolster with just a drop of your favorite CA adhesive to keep things together. The mounting hole fits 3mm to 5mm (or 1/8") machine screws of various lengths for your particular application.
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