Finally, a D20 you can print with reasonable quality without support material!

This model is fully parametric and can be generated/changed using OpenSCAD. Parameters that can be changed include:

• Diameter
• Corner/edge rounding
• Font
• Depth of lettering
• Font size
• Bolding
• Smoothness
• Ordering of numbers
• Numbering style (Arabic numbers, Roman numerals, Braille, etc.)

It's all documented in the OpenSCAD file. The STL file is generated from those initial parameters and is sized at a 6" diameter - feel free to scale to whatever size you want.

As for the text, most D20 models out there have text which is inset perpendicular to the die's faces. However, this creates unsupported overhangs which make them difficult and/or impossible to print without support material. Most open source CAD programs do not have the ability to bevel text without a lot of manual tweaking of edge bevel insetting. This model hacks around that by using progressively inset/outset stepping, which means that its text is far easier to print by simulating a proper bevel. And because it's done fully parametrically using OpenSCAD, you can easily change the font, numbering type (Roman numerals, etc.), or other parameters without messing up your edge bevel distances and having to manually rebevel.

This was designed after getting a request for a novelty 6" D20. After looking around other D20 models and realizing how difficult it would be to print them without support, this was the inevitable conclusion. Please pardon the code quality - this was whipped up in a matter of a few hours.

Update April-May 2017 (updated links Feb 2024):
By request, I'm working on other dice. I'll post links here as I complete them:

• Parametric Easy-Print D6 https://www.printables.com/model/769757-parametric-easy-print-d6
• Parametric Easy-Print D8 https://www.printables.com/model/769763-parametric-easy-print-d8

Materials:

The die pictured in the main image was printed in Hatchbox silver PLA. Recommended layer height is 0.1mm or less - the steep overhangs of the bottom faces strongly benefit from the thinner layers. Also, I would highly recommend using Prusa Slic3r for this. There are two reasons for this:

1. The "Ensure vertical shell thickness" option helps a lot with the angled surfaces.

2. The Cubic infill option seems to be very well-balanced and does an admirable job of making this part very strong.

Also, for fairness, be sure that your top and bottom surface thickness is the same. In other words, make sure your top and bottom layers settings are equal unless you're using a thicker first layer, in which case that thickness difference needs to be subtracted from your bottom layers.

Conversely, you could also load this die pretty toward either 20 or 1 easily by adding more solid top or bottom layers, which is why making it fair takes a bit of care. If you're going to do that, though, at least be honest with your fellow players. Some DMs/GMs might even let your character get away with it if they're a particularly lucky character, but at least be honest about it.

Originally posted here: https://www.youmagine.com/designs/parametric-easy-print-d20