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Bike Handlebar Plug
I recently purchased a used Trek 4300 bike and realized that the handlebar plugs were missing. So I've decided that instead of purchasing handlebar plugs, I'd make them myself with my 3D printer. Cura, the slicing engine that I use, estimated that the cost of a pair of plugs should be just slightly under $0.25 in material costs. Keep in mind, that I used 20 percent infill and a 0.20 layer height. Mileage may vary.
It should fit any handlebars with a diameter of 22.10 mm.