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.

Multiboard Spool Holder Mount

4D_SpoolHolderMount_V4_Left.stl

**!!UPDATED VERSION!!**
I have made a simple but important update to the Multiboard Bolt Driver:  The depth of the socket has doubled so there is less slipping when driving bolts.  note:  Ignore V2 as that was an error in uploading the model with my 4D brand.  V3 is the updated, brandless version.

**Updated slicer settings**
I confirmed that although printing this horizontally is the correct orientation for toughness, it requires a substantial support which ruins the texture of one side of the driver and results in a rough edge.  Additionally, if you do not add supports to the socket, it will sag and will therefore be unusable - ask me how I know.

Standard 0.2mm except:
4 Wall Line Count - Increases sturdiness
10% Infill - results in a lighter weight driver
10mm Brim - Not required but I was more comfortable printing vertically with a brim

This is a remix of "Screw Driver" by megatron321

( https://www.thingiverse.com/thing:709811 )

This screw driver has been adapted to drive MULTIBOARD bolts and T-Bolts.  After installing and removing so many multiboard bolts, my fingers hurt terribly so I created a tool to easily install and remove the bolts.  It is designed to fit both plain and flat bolts as well as plain and flat t-bolts.

I added grooves along the head to indicate the sides of the bolts to assist with lining them up with the multiboard tiles.  There are two smaller grooves that indicate the top/bottom points of the t-bolts.

I added a custom brand to the handle base. The file does not have the brand.

It fits perfectly in a Multiboard Horizontal Pole Mount when attached to my Multiboard Multitool Holder.

Multiboard Bolt Driver

This is a remix of "Screw Driver" by megatron321

( https://www.thingiverse.com/thing:709811 )

0.2mm quality
No supports needed if printed vertically

This screw driver has been adapted to drive MULTIBOARD bolts and T-Bolts.  After installing and removing so many multiboard bolts, my fingers hurt terribly so I created a tool to easily install and remove the bolts.  It is designed to fit both plain and flat bolts as well as plain and flat t-bolts.

I added grooves along the head to indicate the sides of the bolts to assist with lining them up with the multiboard tiles.  There are two smaller grooves that indicate the top/bottom points of the t-bolts.

I added a custom brand to the handle base. The file does not have the brand.

I printed this standing up on the base and used a Brim to keep it in place. If you want to deal with more supports, you can print it in its side so the layer lines are perpendicular to the torque direction but I haven't had any structural issues.

MultiBoardDriver_v2.stl

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Multiboard Spool Holder Mount

Multiboard Bolt Driver