A lot of what I do at work involves material on rolls with a 3"-diameter core; Vinyl, Poly, Paper, Canvas.
To help keep myself organized, I designed a little core-insert to label them. I “designed” it in my head about 18 months ago. I had never gotten around the actually putting digital-pen to screen-paper. So I built this while my first project was printing.
First version in purple on the left, fit but was a little tight. Also, I put my engraved label in the handle cutout, 'cause of I’m S-M-R-T. Second version I enlarged and cleaned up the cutout for the “spring” and rounded the other side of the base for easier insertion.
Made a few more, these with a cutout of my skullymask & crossed brushes logo, since these inserts don’t need to be solid and I wanted to maximize my material.