A wall mounted spool holder designed specifically for the Inland spools sold at MicroCenter as shown here:

http://www.microcenter.com/product/434394/175mm_Black_PLA_3D_Printer_Filament_-_1kg_Spool_(22_lbs)

This simple wall-mount spool holder will allow you to attach it to to a stud or use drywall anchors. Your choice of either 2 or 4 screws (I only used 2).

Be sure to check out the original design of this in the sources section to see a larger version of this for bigger spools!

Be sure to print it how the model is currently (horizontal). Printing it standing up (vertical) will cause it to be very weak due to each layer being a weak point.

I printed this at low quality with medium in-fill (for strength).