I made this so I don't have to worry about my Ampoules breaking while going to the clinic to get them injected. my Ampoules are always 50mm long and 10.73~mm wide at the base

I sadly made a stupid mistake in fusion 360 so I couldn't fine tune the settings for the cap without bugging my whole project so you have to scale down the cap's X and Y to 98.5%. Scale down as needed (the cap is very small so it takes only a few mins)

use any settings. if you're feeling cool try a tpu cap with a lower scale :P I made it kinda bulky for extra comfort but it's honestly unnecessary IMO.