Full redesign from scratch other than the Keep Making push fit part.
Made sides wider, stronger and with angles to easily slide on the tweezers. Also, it prints horizontally.
To attach to a multiboard, either push it into one of the tile connectors like I did or use one of Keep Makings multiboard snap or a bolt with the push fit center.
If you use the file(s), please like, rate the design and leave a comment (you can get points for doing so). If I know people like my designs I will continue to share them publicly.
Full redesign of @JimDevenney_1422027
Used Keep Makings push fit remix part