A1 top mounted gridfinity

I recently found the model this project was remixed from and I thought it was great. But I wanted more storage, and a way to keep the external spool holder attached to the printer even with those gridfinity baseplates in place. So I thought a two-part baseplate would work. Some hours later I had a prototype and after a few changes I'm publishing my final version (for now). My version of this idea allows you to use the external spool holder with all grids populated with bins. If you want to h