Case with a fat figure 8 shape

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https://blobgarden.neocities.org/blob52/blob52.html This is a hinged case based on a mathematically defined shape. The outer shape is defined by the following equation, of the form f(x,y,z) = 0 (-0.18619E5)+(-0.228985E4).*x.^2+0.892569E3.*x.^4+(-0.5721E2).* ... x.^6+x.^8+0.918261E3.*y.^2+(-0.558184E3).*x.^2.*y.^2+(-0.8971E2).* ... x.^4.*y.^2+0.4E1.*x.^6.*y.^2+0.226969E3.*y.^4+(-0.779E1).*x.^2.* ... y.^4+0.6E1.*x.^4.*y.^4+0.2471E2.*y.^6+0.4E1.*x.^2.*y.^6+y.^8+ ... 0.210743E4.*z.^2+0.11479E4.*x.^2.*z.^2+(-0.5771E2).*x.^4.*z.^2+ ... 0.4E1.*x.^6.*z.^2+0.849298E3.*y.^2.*z.^2+0.4842E2.*x.^2.*y.^2.* ... z.^2+0.12E2.*x.^4.*y.^2.*z.^2+0.10613E3.*y.^4.*z.^2+0.12E2.*x.^2.* ... y.^4.*z.^2+0.4E1.*y.^6.*z.^2+0.878329E3.*z.^4+0.5621E2.*x.^2.* ... z.^4+(-0.355271E-14).*x.^3.*z.^4+0.6E1.*x.^4.*z.^4+0.13813E3.* ... y.^2.*z.^4+(-0.355271E-14).*x.*y.^2.*z.^4+0.12E2.*x.^2.*y.^2.* ... z.^4+0.6E1.*y.^4.*z.^4+0.5671E2.*z.^6+0.4E1.*x.^2.*z.^6+0.4E1.* ... y.^2.*z.^6+z.^8 = 0; I used the Octave function 'isosurface' to generate the mesh that defines the outer surface. I used OpenSCAD to hollow out the interior, add the lips, add hinges, and other details. I printed the case out of PETG without too much trouble. Build instructions: If you want to try making a box with this sort of hinge before committing to this large a print, try https://www.thingiverse.com/thing:3407459. That project and this one use the same hinge arms. The files here use a 1.81 mm hole which has worked well with several different filaments. Print each of the following STL files: arm_set.stl combo_top.stl combo_mid.stl combo_bot_trim.stl Assemble the hinges See https://www.thingiverse.com/thing:3407459 for a closeup of the hinge pieces and how they go together. Try pushing a long piece of 1.75 mm through all of the hinge holes first to make sure they are not blocked up. Use 1.75 mm filament for the hinge pins and hold them in place by flattening the ends with a soldering iron separated from the plastic with aluminum foil. Some foil may stick, but it does not matter and can be trimmed easily.

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