Little can and bottle strainers that will protect your beverages from wasps, bees and other large insects! You may found them useful if you plan to spend some time outdoor during summer :)
This thing was not tested yet - please let me know if you have any comments!
More information about this project (in Polish):
Print without supports - if your printer is able to make short bridges, you shouldn't have any troubles with this thing.
Start with printing PlasticBottleBeeProtector.stl and check how it fits the plastic bottle neck. It needs to be printed very precisely, and probably it will be a bit too tight or too loose. Try to resize the STL model a bit, change printer flow rate or slicer extrusion multiplier by few percent.