In my small bathroom there is no space for charging my electric toothbrush near an electric socket. So I reprapped a small base to be fixed on a water pipe near an electric socket. No, green is not the best color for this thing.

Print the base (can I recommend the color white?) and use a single m3 bolt with a nut (trapped in the base) to fix it to a water pipe.

The TB-base.stl is the stl used in the pictures. Later I realized that it would have been better to make some holes in the bottom (TB-base2.stl). The holes won't be visible, but they will allow for possible condensation below the charger to escape easier. Printing time will be reduced too.

The shape of this thing depends very much of the type of the toothbrush charger. My toothbrush is a Braun OralB 500 which is very common type, but each type comes with a charger with a slightly different shape. The design is straight forward though. I attached the .blend file in which I used a photo of the bottom of the charger as a background picture. I then traced the outline using bezier curves, converted the curve to a mesh and extruded the shape. The thickness of the wall was created by using a scaled up version of the extruded mesh and subtracting the previous mesh from it. This results in walls which are thicker on the wide sections which may not to be to everybody's taste: feel free to improve on this design!

Check the size of your water pipe. Mine is 12 mm in diameter. The base is snapped on the pipe and the m3 bolt is there to prevent the base from coming loose.