Case fan center mount adapter

The manual for the Jonsbo D41 suggests you can mount a 120mm fan above the drive cage. However in reality, they did not punch holes for that configuration and you can only mount a drive cage or a 120mm fan, but not both at the same time despite there being enough room to mount the fan. This model solves that issue by letting you mount the case fan to the remaining mounting holes (which just so happen to be in the center of the fan) while the drive cage is installed. With the provided STL and a standard sized 120mm fan, there should be enough clearance for a typical sized PSU (in my case a Seasonic 1000W). Parametric scad included for remixing, configuration, or adaptation to other fan sizes. If you don't need the tunnel, you can also print top and bottom pieces separately by selecting the sealed option. Print in any filament, 4+ walls (since the self-tapping screws will bite into the plastic). Use standard case fan screws for mounting both the fan and the adapter to the case.