This dice uses the symbols for the first six elements on the periodic table to represent the numbers 1-6. I designed this for a science game my daughter made.
This is a cool looking print, but if you have a filament printer, it better be well tuned. This looks easy, but is not a simple print. I designed it to be able to print with no support, All of these edges have 45 degree bevels to help you out. There is some bridging to accomplish on the face down side as well. Printing a brim would also help.
I have printed at 75% and 100% with 25% fill and get good results. The pic is of one printed at 50% scaling (x,y,z), which is about 23mm (just under an inch). I don't think my filament printer would enjoy printing it much smaller.
While printing, learn the element numbers.