Printrbot Simple 1405 XL Taulman Spool Mount

This thing allows you to attach Taulmans small spools up on the original mounting bar.

Even cheap PLA is strong enough for this application.

BUT NOTE: You'll either have to take out the screws, that hold the sandwiched pieces together, every time you put this on or take it off, OR, (do what I did) counterbore the screw heads with a 6mm drill and shorten the screws on the other side with a dremel.