I was recently given a spool of MakerBot Method Series PLA to work with, only it didn't play well with my printer! So I whipped up a quick and dirty spool adapter to allow me to print the things I needed to print. It's not perfect, but it works well enough. Feel free to adapt it to your needs or send me requests for modifications.
You'll have to pop out the insert that the MakerBot spool comes with, which can be a little tricky, but once you do you can put this in and put the spool on a mandrel of some sort. The hole is 2" (50.8mm) inside diameter, but it can easily be modified to something else.
The author marked this model as their own original creation.