1515 extrusion adjustable grip mount single M3 screw

thingiverse

These snap-in mounts are specifically designed for various accessories, secured by a single M3 screw inserted from the bottom. They snap on securely and can be removed or adjusted as needed. There are two versions available - one is larger and holds its position very firmly, requiring some effort to remove it. The smaller version, however, can be easily installed and removed, but it's best suited for applications where gravity will keep it in place, though it can still stay put even without significant weight on it. It should be possible to scale up this design by 133.33% to accommodate 2020 extrusion and M4 screws, although I haven't personally tested or printed it at that size.