ProtoParadigm Spool
thingiverse
I tried using ProtoParadigm's $5 spool with less-than-successful results. This spool allows you to effectively swap out theirs and is designed to fit on the threaded rod spool holder that comes with the A8. Nice and simple. The photos show the procedure for trimming the original spool and mounting it on this new one.
Download Model from thingiverse
With this file you will be able to print ProtoParadigm Spool with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on ProtoParadigm Spool.