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Chain tunnel for velomobile (parametric FreeCAD)
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Weighs less than driving side chain tube and has ZERO friction.
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To make my alpha 7 velomobile even more efficient I decided to remove the chain tube from the driving side. The chain is now covered with this tunnel to prevent small parts getting into the chain.
You can easily adapt it to fit your velomobile by altering the dimensions in FreeCAD
- length: length of a tunnel (segment). I needed 480 mm in total, so I printed three 160 mm segments, 1× “simple” and 2× “connect” and glued them together.
- thickness: thickness of the tunnel, increase for more strength (not needed imho)
- width: inner width
- height: inner height
- velcro: width of the flat sides (where you may stick some velcro to fix it in the velmobile)
Printed standing upright in PETG, 0.3 mm layers, arachne, 5 mm brim without gap
