Inspired by the quick change universal spool holder by Foreverwinter ( https://www.thingiverse.com/thing:1241566 ), I have created a spool holder mount that connects directly to Multiboard tiles. Essentially, I created a device to accept the bolt head and nut on either end of the spool holder and mashed a Multiboard snap on one end with push-fit threads inside so that it can be secured onto the tile. You can secure the mount onto the tile with either a Mid-Thread Bolt or T-Bolt.
I am using a 5x5 tile to extend the Multiboard out the y-axis instead of a Tile Bracket so that I can mount the Spool Holder on the bottom and still use a Multiboard Horizontal Pole Mount on the top to hang additional spools (temporarily depicted by pvc in pictures)
The Spool Holder Mount is designed to be installed straight out or down at an angle which allows you some wiggle room for different sized spools. I have mine angled down which allows me to switch spools without removing the pole above. There are two stops on either end of the holder to prevent the spool from falling out.
The design is intended to be printed on its side. I don't believe it loads that way in the slicer so you may need to rotate it accordingly.
Slicer Settings: Choose your favorite settings or whatever you deem necessary for this print. I printed mine in Standard quality at 150mm/s with 2 walls, 4 top and bottom layers, and with Creality Hyper PLA. I did not need supports
Be sure to download my bolt driver ( https://thangs.com/designer/4D%20Labs/3d-model/Multiboard%20Bolt%20Driver-996599?manualModelView=true&source=All+Files ) to help with installing the bolts.