Diagonal cut Menger sponge
thingiverse
The Menger sponge is a fascinating fractal object with various mathematical properties and an unexpected physical attribute explored by George Hart in his video and webpage. Numerous Menger sponges are available on Thingiverse, including one displaying the diagonal cut discussed by Prof. Hart. However, I had troubles slicing this part correctly; thus, I created my own in OpenSCAD. Even the second-order version posed issues for Slic3r, so a Netfabb Cloud-fixed STL is provided. For either order, two sponges are needed to complete a cube. These half-cubes should print effortlessly; however, note that Slic3r may face issues with the second-order file, which can be resolved by processing it through Netfabb Cloud. Additionally, for better first-layer results in Slic3r, choose rectilinear fill instead of concentric for the second-order cube. The first-order examples were printed using an OB1.4 Printrbot with PLA and a Printrbot Jr with SainSmart PLA, both at 0.3 mm layers, 20% infill, 3 perimeters, and top/bottom. Regrettably, the Printrbot Jr's lack of heated bed resulted in slight curling at the bottom print, slightly affecting the fit of the two halves together.
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