I made a Lidinoid (https://en.wikipedia.org/wiki/Lidinoid)

0.5 (Sin[2 x] Cos[y] Sin[z] + Sin[2 y] Cos[z] Sin[x] + Sin[2 z] Cos[x] Sin[y]) - 0.5 (Cos[2 x] Cos[2 y] + Cos[2 y] Cos[2 z] + Cos[2 z] Cos[2 x]) + 0.15 == 0, {x, -Pi, Pi}, {y, -Pi, Pi}, {z, -0.5 Pi, 1.5 Pi}

(Note that in the image of my print, my model was actually ranged z={-Pi,Pi}, but I changed it to z={-0.5Pi,1.5Pi} so that the model is continuous.)