The perfect way out of or into a sewer or dungeon: A hatch with grill cover.
In this pack you find two different base hatch versions and two different grill versions for each of them. They do not explicitly use OpenLOCK, but are measured to exactly fit your OpenLOCK dungeon build (2x2"). Also suitable for more modern settings.
FDM printing suggestion: 0.2mm / 15% infill / no supports