18650 battery + wemos 18650 battery shield v3 + 3d printing box

I'd like to make my project in very safe way. I also know the lithium batteries are so powerful that it could make fire. The shield is also too much exposed. That is way I made a enclosing box by using 3d printer.
I shared the files on the Thingiverse (a 3d files hub)

[ 3d modeling file ]
3d printer file https://www.thingiverse.com/thing:2839419

[ Parts ]

(Amazon)
4 x 3 * 8 screw https://amzn.to/2pDXEue
1 x 18650 battery https://amzn.to/2udROV6
1 x 18650 Battery shield V3 https:/