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In my Make (http://www.thingiverse.com/make:277320 done locally, not via customizer for 60mm -> 30mm) I find that unfortunately there's not enough space around the duct wall on the 30mm side to let me fit M3 socket head cap screws. It looks I need to manipulate n_pipe, "pipe reduction ratio relative to fan 1 diameter", to pull the walls in a bit. I wonder whether it's feasible to implement an explicit clearance around the mounting holes instead, so that e.g., the diameter of a screw head can be entered directly...

Parametrizable any size to any size fan adapter with manifold tube angle
by jepler