by milligan, published
Runners, channels and sprew basin for sand casting. I can make a sprew if requesed. Edit: SketchUp files have been added. Edit: slight changes to the runner, stl files added (after they were accidentally deleted)
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You can scale this to the size of your casting, but make sure to scale all of the parts. Only one part per runner is recommended. Use a .75 inch diameter (on the narrow end) sprew.