Triangle Spool Holder for IKEA GRUNDTAL shelf

Inspired by Mosaic's spool holder - this is similar but designed for the IKEA GRUNDTAL wall shelf rods (discontinued, but still available on eBay and other places). The shelf came with 6 60cm long rods which gets you up to 2 filament holders. The ends allow for the original screws that came with the GRUNDTAL shelf to secure the end pieces together although these are not required if you are simply laying on a shelf.

Rods have an approximately 8mm radius.

Mosaic's original design:
https://www.mosaicmfg.com/products/spoolholder