DIY Warm winter handlebar tubes for fatbikers

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Human: Handlebar tube frames for winter tubes made of durable polyethylene cell plastics. The insulating feature keeps your hands warmer in cold weather. I have used them now for 5 rides and enjoyed warm hands. You also need some 6 mm polyethylene sheet, 4 pieces of 3 mm x 18 mm screws & nuts, and a bit of contact glue to complete your tubes. Printing and building guidance (see pictures): You need some skill to put this together. There are some useful hints in the pictures. The plastics hold in place on the frame tube with rings that lock into ends. (See picture) You need to cut the cell plastic sheet to the right size (115 x 91 mm) and glue it to form a ring before installing other parts. You need one holkki3.stl and two of the others for one tube. There is a removable stand in holkki3.stl that you must remove after printing. Be careful not to tighten too much, just enough to keep them in place.