Spool holder bracket for topless Robo3D

EDIT: A new version of this that directly supports 1 inch square extrusion is coming very soon, along with instructions to build a removable square frame for the Robo using the stock mounting points.

This is a bracket that fits to the cover mounting points for the Robo3D so you can attach whatever you like, in my case arms for a spool holder.
I've included the spacer I designed to encase my timber upright for a tight fit though you'll likely need to design and print your own spacer for