Rocket Cup 3in

This is a rocketry fincan for 3in rockets. You can glue it into the bottom of a 3inch body tube using a coupler (check out my coupler 3d print in my profile), and it works very well. You will need to pause the print and insert hex nuts into the fincan in two specific chambers to allow for you to use the retainer for this fincan (which is posted on my account as well). My rocket flew very straight on this same fincan, so I'm sure it'll work for your rockets too! Comment any questions down below, and thanks!