If you use Medela pumps you likely have used their storage bottles. You can use them with the pumping attachments; however, that makes the bottle extremely top-heavy and prone to tipping over (YIKES)!
I created a simple base that makes it less top-heavy and gives it a greater surface area so it is less likely to tip. It fits very snug so you have to twist a bit to get it over the threads and then it snaps onto the base flange. I've printed 2 and they fit several bottles the same way. A side note is that when not attached to bottles they snap together in a stack as seen in the picture.
This is my first ever completely custom design so I'd be happy to have constructive feedback! Enjoy!
I have it on the plate "upside down" because it prints perfectly without rafts that way. It shouldn't need rafts or supports if you have a decent printer. You know best what your printer needs.