Lately, there have been a lot of spool holders posted on Thingiverse.  I promised others on Thingiverse that I'd post this last week.  It's been stress-tested for several months now and is ready for primetime.  
Here is the second version of my original filament spool system with significant advantages.  First, it's 100% printable.  No hardware is needed for either the mount or the actual spool! The entire spool and mounting hardware can be printed on a Cupcake / ToM from only two .stl plates, and only four prints. Its standard size is ideal for 1lb rolls of plastic and has been tested with ultimaker and MBI rolls.  Even if you order 5 lb rolls, unless you print constantly, you probably should cut it into smaller bundles since the hydrophilic plastic will absorb moisture.
The spool mounts to the side of the Cupcake (I don't have a ToM but expect it would work too) with friction-fit clips. A PTFE tube to act as a guide for the filament is optional but recommended (I have successfully printed about 3 lbs of plastic…

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