Fits a 2ba dart tip in the threads. Screw a tip in and insert into soft tip dartboard for a bullseye size target to shoot at. Really fun and if you score on pen and paper, darts in the circle can be worth 5x points!

File is for some reason upside down. Just rotate it in slicer like in the picture before printing. I printed with supports for some reason and it comes out okay. Not sure if you need them.