Telescoping Cardboard Spool Adapter Ring

I used various cardboard spool adapter rings, but I had to prepare multiple sizes due to size differences and individual differences, which was very difficult. So I made my own adapter ring with a spring that can accommodate slight size differences and accommodate just one ring.Since it's homemade, I'll be honest, it's not the best made. If you value simplicity and practicality and don't care about appearance, I recommend this. I haven't had any issues with the eSun and ELEGOO spools I normally use, but please note that problems may occur with other spools.Currently, the adapter ring has not come off during use, but please note that it may not be compatible depending on the spool and usage conditions. In particular, if the spool is stored in a vacuum bag, it may come off if it is bent or damaged. I made it out of PETG to ensure the flexibility of the spring. I haven't tested it, but I think ABS would work fine too. Now, enjoy printing! ==========================