Fair 7 sided dice - D7 - Design and 3D printing

Title: Fair 7 sided dice - D7 - Design and 3D printing. Watch on youtube:

Tags: 7 sided dice, 7d, dice, 3dprint, fusion360, 7 sided die, seven sided die, product design,

Another very mysterious dice - the 7 sided die (D7), pentagonal prism, is it a fair die? Will it equally land on pentagonal base and rectangle sides?
In this video I am designing, 3D printing and testing seven sided die with geometry of pentagonal prism.
Base edge of pentagon is 15mm and length is 19.2 mm, all edges are with 1mm chamfer.
Bonus: the real fair D7 is a heptagon based prism with rounded base sides, but this time with days of week on it (instead of numbers).
Both STL files from video can be downloaded below this text.

*UPDATE: 2020-05-22: Fair D7 with numbers added (not weekdays)


Download files:

dice_7_heptagon_numbers.stl 116.6 kB [View»]
dice_7_heptagon_weekdays.stl 188.5 kB [View»]
dice_7_pentagon.stl 198.9 kB [View»]

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