Here is the design of my Oral-B Vitality travel case. The .stl are ready to be printed in PLA. However, depending on the printed PLA quality, you might have to sand the screwing a little bit for a perfect fit.
This case is made to be able to transport the toothbrush safely, with it's head mounted. It may only fit the Vitality Oral-B model as I had no chance to test the others. If you do it, please let me know.
By the way, this version has some holes to help for the cleaning and avoid moisture. I have also upload my first version without holes for those who prefer this one.
Have a good day and happy printing!
P.S. If you like the design, please consider a small tip. It would help me buy PLA to test my designs :-)