Skew die
thingiverse
Henry Segerman designed skew dice based on the asymmetric trigonal trapezohdron which he explains in this video: https://www.youtube.com/watch?v=OI5njPo7zC0 This is a customizable version in which the skewness of the die, its roundedness and size of pips are parameterized. See https://kitwallace.tumblr.com/post/627234076831760384/skew-dice The die is not oriented so it will need laying down on a selected face for printing.
Download Model from thingiverse
With this file you will be able to print Skew die 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 Skew die.