120mm Case Fan Duct for PCI/ATX Expansion Slot

thingiverse

A duct that adapts a 120mm fan to blow out the PCI/ATX expansion slots is needed. The exhaust opening takes up three slots, with a 25mm-thick fan taking one more slot. The combined assembly takes up exactly four slots of width. The bottom of the duct must clear both PCI-E and taller conventional PCI slots. Mounting the fan requires either fan screws or cable-ties. Printing with the largest flat side on the build plate is necessary. Supports are required for a very small overhanging part of the PCI bracket. In Cura, setting supports to "Touching Build Plate" keeps it from generating supports between the vent fins. If this option isn't available, turning off supports altogether and letting the bracket sag slightly may be better. Versions exist: V1.0 is the initial revision and the versions seen in the pictures above. V1.1 thickens PCI slot brackets from 1.2mm to 2.0mm. This may be too thick for some cases, so measure it before printing. V1.1_rotated lays flat on the build plate with its Z-axis facing up. V1.1b is a branch of V1.1 with a shortened tongue that slides between the motherboard and case wall to accommodate 200 mm diameter build plates. This version does not require supports. Source files via an Onshape link are provided so users can modify the duct if needed using a free Onshape account. All versions are accessible in Onshape, but a login is required to see the entire version history. The PCI and ATX mechanical specifications were helpful when designing this thing. Print Settings: Printer Brand: RepRap Printer: Monoprice Maker Select v2 (Wanhao Duplicator i3) Rafts: No Supports: Yes Resolution: 0.2 mm, 2 shells Infill: 15%