The inspiration for this rack came from [https://www.printables.com/model/403853-filament-spool-rack-stackable-glueless.](https://www.printables.com/model/403853-filament-spool-rack-stackable-glueless.)  However, there is enough variation in my design I think I can safely call it my own. 

You can configure it to any size or shape to meet your needs.  It is stackable and uses dovetails and bolts to lock it in to place.  It's made with cheap conduit tubing that you can purchase from the Lowes or Home Depot electrical isle.

The frame halves are glued together with epoxy.  

The base can be fitted with roller blade type casters, 7/16" shaft,available on AMAZON:

 [https://www.amazon.com/gp/product/B089SWWG79/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1](https://www.amazon.com/gp/product/B089SWWG79/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1)

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Parts:

½" EMT Conduit for the tubing 

¼ x 1-inch bolts and nuts to lock the conduit into to place (4 sets per level)

5/16 x 2.5-inch bolts and nuts with a fender washer to lock each level in to place (2 sets per stack)

For the first level you will need to print:

2 base units

2 top units

For each additional level you will need to print:

2 bottom units

2 top units

2 keys

Additional pieces (not required)

Cap:  To finish off the top level

Hex cap:  To hide the edges of the conduit

Sleeve:  To place over the conduit for a more pleasing look.  You will need to print many of these and scale them accordingly. 

Square cap:  To hide the square holes