18650 battery case

I don't like the common mold 18650 battery case. Mostly they are not suitable for the flat end, without protected board version battery, I mean the positive pad cannot contact the battery which waste a lot of my assemble and debugging time.  I draw this one with fusion 360. and add 2 holes to tie the string to remove the battery easily. The metal contact is from the toy AA battery contact pads.

You can see how it works on my tweeter. 

https://twitter.com/i/status/1414981333810565121

Material I used on the video is wood filament PLA.