I've modded one of the hooks of the original honeycomb wall to have 2x4 Lego piece instead of the hook. I use it keep a mini Millenium Falcon on the wall. The fit is tight enough to keep it vertically. It's been there for more than a year and hasn't fallen off yet so the fit is pretty tight.
I've printed it with 0.6mm nozzle and Pursa recycled PETG, but I reckon it's simple enough that almost any settings/materials will do.
The author remixed this model.
Fix typos in the description