A printed latch that snaps panels onto 2020 extrusions sounds simple, and that is exactly the idea behind this mod. Maple Leaf Makers ranks it among their favourite mods and calls installation super easy, which for anything that touches panel alignment is high praise in my book.
Construction stays minimal. A printed outer frame pairs with a pivoting lever that has diagonal grip slots, and the lever turns on a metal screw or pin. Short lengths of 1.75 mm filament serve as hinge pins, pushed through matching alignment holes in body and lever, then trimmed flush with cutters. An M3 socket head screw, between 12 and 20 mm depending on latch size, passes through the center slot and threads into a hammerhead T-nut. The finished latch slides into the extrusion groove and gets secured with an Allen key. In use, the hinged arm flips open to free a panel and snaps back to hold it in place.
The shown example has a black frame with a red lever, and a dual-color version is shown working on a vertical frame extrusion. Several printed components of varying offset sizes appear as well. Credit is handled honestly here: the design came from another designer and was shared on GitHub with a Readme, and Maple Leaf Makers said they cannot take credit, naming two other people as having made it possible.
The maker's team currently runs the mod on 4 machines with no issues reported, and one report mentions more than a thousand hours of printing with latches still working and keeping a good seal, front doors included. Sizing is the one gotcha: choose a latch that snaps shut firmly and grips the panels hard, as one wrong guess on offsets meant a reprint to seal the foam properly. As far as the maker knows, no 1515 version for the v0.1 exists yet, though doors with 270 degree hinges and panels that come off are on the exploration list, latches included.
Project by Maple Leaf Makers. Watch it on their YouTube channel: