There have been times when I was looking at some items in stores and wished I had a spirit level. This tool will come in handy when shopping for furniture.

I bought a level from Dollar Tree for $1.24 and removed the screws to access three bubbles. Two bubbles are the same size ( 9.2 mm x 25 mm) and one is larger( 9.2 mm x 39.5 mm). The remaining smaller bubble will be used for another keychain. The larger one will be used to make a level for hanging Ikea doors, specifically. I will be posting the model on Printables after it's done.

You can get 100 spirit level bubbles from a seller on eBay now for $29.99 - https://tinyurl.com/nm72a6b9. I think these make great gifts and can be given to customers with your business name. 

It is intended that the plug be glued into the hole after the spirit bubble has been pushed through. The size of the hole depends upon the filament used and supports. I printed once with PLA + and full supports; next with LW PLA and no supports; and finally with LW PLA and supports on the build plate only. I was able to get the bubble in the hole of the full supports print; I trashed the no supports print; and I had to widen the holes of the build plate supports print with a rotary tool.