1968-1973 Datsun 510 Replacement Defrost Duct
thingiverse
The original part is a rubberized custom tube that connects from the heater box to the dash diffuser. This replaces that part. A short section of 2" defrost duct is required to complete the installation. OpenSCAD file is included and requires commenting of "mirror" to create both left and right parts. Instructions I used ABS to create this as PLA is likely to get soft with the heat of the defrost air and the car interior in summer.
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