1968-1973 Datsun 510 Replacement Defrost Duct
thingiverse
The rubberized custom tube links directly from the heater box to the dash diffuser, taking its place in the setup. To complete the installation, a short section of 2" defrost duct is needed. An OpenSCAD file is provided and requires a "mirror" comment to generate both left and right parts. When creating this piece, I chose ABS due to its durability against the heat from defrost air and car interior temperatures in summer. PLA is likely to become soft under these conditions.
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