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I don't mean to disparage the project as I've been using it until I got a proper holder design.
The issues I have with this:use of supports is very troublesome in MakerBot Desktop, the layers are parallel to the shearing force (two PLA prints broke), takes a long time to print and requires cooling and/or slow speed. Hopefully I won't offend anyone, I made a design in two parts that takes less time to print and is more sturdy: https://www.thingiverse.com/thing:2543519
As a bonus, it allows "quick-changing" spools, if you're into that thing, and clamping onto most surfaces, including the spool holes.

Spool holder (modular)