This spherical dice has a small iron ball inside. This makes sure the dice lands on a number and no guesswork is required. 

Option 1:
Print the full version. Pause the print at z=15mm to insert the ball. The numbers are embodded into the ball.

Option 2:
Print out the two halfs in PLA and put a small iron ball inside. Then glue both half's together. I have used a 9mm steel ball. Last step is to paint on the numbers. 

Tips for printing:

• use the same amount of top solid layers as you use perimeters. this makes the ball as round as possible
• a raft helps to print as round as possible

Update 14.mrz.2023:
Added a version with embossed numbers. Pause the print at z=15mm to insert the ball.