In the first print the wall got too thin. The battery pack snaps in place. Mine are a bit too high so the tile itself wobbles a bit on the battery pack. Doesn‘t matter if connected to other tiles.
I designed a flame diffusor for the led, so no hotglue is required. https://www.printables.com/de/model/928660-flame-diffuser-for-3mm-or-5mm-led
