I was in a designer's block, so I asked ChatGPT for some ideas, and it told me that I could try making a brick crystal system. THIS MODEL WAS NOT CREATED BY CHATGPT!!! I simply used an idea that it generated for me and modeled it in Onshape. I'm really happy with how this model turned out. The tolerances could use a little fine tuning, but if you use my settings and print with PLA, they should turn out fine. The blue ones are made with PLA, and the purple ones are made with PETG. The purple ones are kind of tight, but they still work. You just need to push really hard. 

I hope you like this model! Happy printing!