I made a remix of this grease packer so it can be be used to quickly and easily apply PTFE grease to 8mm lead screws. Specifically fit to the Super Lube 21030 (3oz) tube so I can get it on the rear lead screw on my Bambu X1 much easier. Works great!
I used PETG for mine and I'd suggest it for you as well. I had an impact that caused my initial print to fail, so the attached .3MF from Bambu Studio will print them by object instead, including my eSun PETG profile and rather slow but steady process profile.
If printing separate, I'd recommend three walls just to make it pretty much solid. Even so it's only 10g.
The author remixed this model.
No longer used to grease the inside of bearings, instead cups 8mm threaded lead screws from the point.