The file 'Raspberry Pi Fan Shield (stackable) 3D Printer Model' is (STL) file type, size is 15.1KB.
Shield to stack on any raspberry pi model B. You can buy the standoff screws, which are not printable, as well as the fan (30mm) for cheap from aliexpress or ebay.
Pi_fan_shield_v2.STL | 87.6KB |