I designed a numerical balanced D20 die that uses number objects for multi-material coloring rather than paint by number like other dice. 
This includes a 3MF model for the MMU dice and a STL for the single color recessed number die. 
All numbers are skewed to be aligned flat with the bed for best print orientation when printing in multi-materials. Just open the 3MF in your slicer (have tested Orca and Bambu Studio) and make sure to keep the extra objects as "parts", then select the D20 object and change the color. It is easier to leave the numbers as the first color and set the dice body to a new color. The dice body is name D20 and the numbers are named correctly or use a "_" to denote which part of the number it is.

All test prints were done on a Bambulab A1 mini in PLA or PETG and the max angle is 48 degrees. 
Tested at 0.12 and 0.16 layer height, 2 walls, 100% infill, and 8mm brim.
- A1 mini print times -
Single color PLA - 1:10 hours
Multi-color PLA - 0.12 - 13:30 hours (varies by purge amount)
Multi-color PLA - 0.16 - 6:45 hours (varies by purge amount)
Single color 0% fan PETG 20mm/s transparency test - 3:55 hours

Going to test more MMU dice in the future with PETG/PLA, PLA/TPU, PETG/TPU. Did one test print with clear PETG and green PLA, no issues with the two materials together but it lost adhesion with the bed, and I didn't have enough PETG for another print.

Numerically balance D20 die is based on a paper by Bosch, Fathauer, and Segerman. The point of ordering the dice in this manner is to keep the average roll at 10.5 regardless of any defects in the dice. Vertex sums average 52.5, face sums average 31.5, 20 and 1 are on opposite faces, and average roll over enough time is balanced at 10.5. 

Commercial use permitted with attribution. D20 Dice are very common, I just wanted to make this dice easier to print in FDM rather than resin.

D20 Dice Numerically Balanced MMU

D20_NB_MMU.3mf

Version two of my CPU puzzle, bigger and harder to solve. Took the concept from the original CPU puzzle and added two more pegs. Unlike the smaller puzzle the pattern for this one is slightly more random. 

Styled to look like an Intel CPU and pegs are slightly stronger than previous. 
 
Can you solve this puzzle? Feel free to leave some feedback and post pictures of a completed puzzle. 

Good Luck and have fun.

CPU Puzzle 6x4 (Intel)

CPU Puzzle 6x4.3mf

The CPU puzzle, can you insert all of the pegs and solve it? Original design was made in brass and is sold by Puzzle Master. 

After puzzle is printed, the pegs should easily slide into the CPU block(AMD) and should be able to fall out on their own, to increase difficulty. 

No supports needed and recommend to be printed at 0.16mm layer height or finer for better holes and rounded pegs. 

Good luck and enjoy!

Original concept of this puzzle was by Rocky Chiaro. Designed as AB-L puzzle in 2004, and also known as the Magic Wands Puzzle.

CPU Puzzle (AMD)

CPU Puzzle.3mf

Designed this key rack for a friend and thought I would share it with the community. It is designed to hold "pocket accessories", a wallet, and keys. The full size version needs a 300mm print bed and the smaller a 180mm bed. 
I recommend printing this on its back with a strong material, 3 walls, and may need brim to keep the corners down. 
Enjoy!

Simple Key Rack

Key_rack_300.3mf

Just played some Minecraft Legends and wanted to make a Piglin model. This one fully articulates and is print in place with built in supports. You will have to take a cutting tool or blade to the joints that move, to free them up and remove the thin supports. 

Test printed on an Ender 3 with a 0.6 nozzle, 0.2 layer height, 4 walls, 4 top layers, and 3 bottom, at 30mm/s. The supports between the head/chest and chest/legs is 0.2 in height with 0.2 air gaps,  with softer PLA it will scrap off easily. The arms take a little bit of patience to free up and start rotating, and with softer PLA there is a risk of twisting them off, so take some time. Included a sectional image of the joints to make it easier to see where to apply a blade to. Some paint or hot glue can add more friction to the joints. 

Good luck and will add more or update model with requests. 

Piglin Minecraft Legends

Piglin_Minecraft.stl

My daughter loves pikachu and baby yoda, so I combined the two, she loves it, so I hope others will enjoy it as well. Combined and modeled, "Baby Yoda with soup cup" and "Pikachu(Pokemon)", on thingiverse.

Does need some supports for the bowl and arms, used tree supports at 70 degrees, in Cura for easy removal.

Timelapse of it printing linked below
https://imgur.com/gallery/FzRp87s

Baby Pikachu

D20_NB_Dice.stl

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CPU Puzzle (AMD)

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D20 Dice Numerically Balanced MMU

D20 Dice Numerically Balanced MMU

CPU Puzzle 6x4 (Intel)

CPU Puzzle (AMD)

Simple Key Rack

Piglin Minecraft Legends

Baby Pikachu