It looks like I had a completely different take on the Sand Castle Challenge. I have a two and half year old son, and one thing that I find important is emphasizing the idea of creativity. My small Single Block design was created as the smallest building block that would give someone the ability to create something much larger. Just like a single lego. It looks so simple by itself, but with a creative mind behind it, the options are limitless. The shape used was done so that you could put the blocks together to easily create a circle. The large face is the front side and has small indents on the corners to give a seperation between blocks when placed right next to each other. However, you can make a straight wall with no issues using this shape also.
Why so small? Well we are somewhat limited being a good distance from a beach. The size here is created for all those that have small sand/water tables for their children. I am also planning on seeing if this works good for "sands alive." (if you don't have children, you may have no idea what I am talking about). The other great thing is that you can just scale up the design in your printing software to meet your own needs. It's such a simple design, you can scale it to multiple sizes, and use all the sizes together.
There is a second model that makes creating an entire circular structure all at once.
Some may look past this very quickly, and some may see what I was trying to do with this. Either way, I created and printed this after my son went to sleep, and waking him up just to go play in the sand for a bit is really what this was all about. Even if my wife wasn't too hapy with us being up late and getting dirty.
My print settings
Layer Height: 0.2
Shell: 0.8 (0.4 nozzle)
takes less than 15 minutes to print
Once printed, fill with wet sand, and then tap lightly on the top to get the sand to come out.