eSun PETG will give you better than ABS Strength with more flexibility and no need for an enclosure to print it. MakerGeek PETG is more rigid than eSUN and FDA approved for food contact.. Just started using it and seems less sticky that esun. Also prints ate 255 rather than the 245 of Esun.
Sounds like you are about 6 months ahead of yourself.. Unless I read this wrong you don't have a printer or the slicing software? There is a bit of learning to do and probably should do that with PLA, you can develop your parts in PLA then print them in the more expensive more difficult material after you are on your feet.