The openGrid models included Multiconnect snaps with a threaded snap and a screw-in multiconnect connector. This 2 part assembly allows using a folded screw that is printed in a stronger orientation, but if high strength is not required* these simple snaps have the multiconnect connector as part of the snap. There are 2 different snaps, one using the standard snap (pushes straight into the openGrid tile) and one using the directional snap (an arrow on the back indicates the side that goes in first). These were made from the modeling files that David D provided with the openGrid and Multiconnect frameworks. There are also versions of these snaps for openGrid Lite and versions with a non-rotating connector (for both openGrid and openGrid Lite).

My profile is set with 3 walls and 15% gyroid infill.

Please note that layer adhesion where the connector meets the snap body may be a limiting factor because of the print orientation. Although the snaps pulled out of the tile before shearing in my testing, it is possible that print settings or different materials will impact layer adhesion, so if you are planning to use this for something heavy, I would suggest making a test print first, or using one of the threaded snaps with a folding multiconnect connector.

Updated to use the v2.1 directional snap.