EDIT: April 22, 2018 - Added walls.
My kid loves the game Robot Turtles. We both decided it would be more fun if we had actual 3D pieces to play with instead of just the cardboard tokens.
This is a multi-phase project.
Phase 1, Turtles and Gemstones: COMPLETE
Phase 2, Ice Walls and puddles: IN PROGRESS
Phase 3, Boxes: CANCELLED (I decided to go with this crate since my test print came out so well)
Phase 4, Stone/metal walls: COMPLETE
Phase 5, Game piece storage: NOT STARTED
You can really use any infill you like. I used a bit more on the guns, a bit less on the gemstones.
Everything was designed to fit quite snugly and stay without glue. If not, a little filing/cutting will make it fit. You may need a few taps with a rubber mallet. Remember, you want it to stay in without glue.
Found that someone else did some robot turtles already, but I didn't want the entire turtle to be colored the same. Went up one level to the turtle model they were remixed from and cut a hex-shaped hole in the top.
Then, with the game cards as a basic guide, I recreated the turtle's guns using OpenSCAD.
I decided that simple/durable would be for the best (I expect my kid to be a kid after all) and just whipped up a base/top in a few minutes using OpenSCAD.
Right away I knew I needed to get the walls to nest, since the game includes 20 of them and there isn't enough room in the box otherwise. I decided on a pseudo-pyramidal wall block since it looked good on the board and nested well enough to fit 15-17 of them stacked in a line in the game box. Interestingly, they print pretty well both right-side up and upside down, however I prefer the finish of right-side up. Once I had a general shape decided, it only took an hour in OpenSCAD to finish it up.