GrabCAD
My design features custom pivoting hardware attached to conventional skis. It is the only sled design (that I'm aware of) that would allow the user to ski the sled down the slope in the same way a person on skis can. I believe this would allow a great deal more control, safety and fun for the person sledding. The hardware is of a very simple design and yet would allow for a plus or minus 40.00 degree control range on the runners/skis.
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This model is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
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Check the license (see original page) on the original GrabCAD page. Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer.