This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/9uV8aZUop70
This battery holder is helpful for e-textiles because conductive thread is in contact directly with the battery on the + and - sides, then can be routed through the side holes and affixed to the fabric through them. No extra conductive materials are needed!
Print it as oriented, standing up. I've had good experience printing it this way, even with the hoops having an overhang. If you print it laying down the top will cave, so not good. Printed with supports is not good, either, as the battery slot will be hard to clear out.