Lego Compatible Mug
thingiverse
This is a mug that can be held by a lego minifigure although it unfortunately can't be placed on a stud. It took a few tries but I eventually got it to work.
Download Model from thingiverse
With this file you will be able to print Lego Compatible Mug with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Lego Compatible Mug.