Zero Friction roller spool holder for Z18

Edit 06/09/19
My first holder that I printed 2 years ago failed. I walked into the room to find a roll of PLA on the floor. I am finishing up a new one as I type, will replace the file asap. Sorry about this.

This roller holder comes with simple tubes to insert in spools with a cavity opening. I installed roller bearings that are 31mmOD x 10mm wide with 12mmID the cost of the project was ~$10.

Please comment if you use it.