Gridfinity 1x1 "sharps" container

Designed this 1x1 u6 “sharps bin” for my X-ACTO blades. Key design considerations:1-hand use (ability to insert the blade, loosen the ring and have the blade drop in)internal ridges to prevent blades falling outone-piece construction so blades can't fall outand… of course, Gridfinity :)If you use the .step file instead, make sure you disable supports. The model should be placed opening-side down (so that the bottom is the over-hangs).