About a decade ago, I bought a storage box for christmas light strands and it came with some plastic reels that you could wrap the lights around. They were great, but had some issues.
Recently some of them broke, so I set out to create a new version that improved upon some of the annoyances that I had with the originals.
I print them in three pieces, the main body and then the top and bottom bar which snap in to the main body. I had originally designed it to be glued in but with the extra filament that gets left behind from the supports, it fits in very snugly and needs to be pulled apart with some force.