Case with a fat figure 8 shape

thingiverse

https://blobgarden.neocities.org/blob52/blob52.html This case is built around a mathematically defined shape that serves as its foundation. The outer edge of the case is defined by an equation in the form f(x,y,z) = 0, which reads: (-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 a mesh that defines the outer surface. Next, I used OpenSCAD to hollow out the interior, add lips, hinges, and other details. Finally, I printed the case using PETG without encountering any major issues. Build Instructions: If you want to test this hinge system before investing in a larger print, try https://www.thingiverse.com/thing:3407459. This project shares the same hinge arms as this one, but it uses a 1.5 mm hole that may not work well with all filaments. To assemble the hinges, follow these steps: Print each of the following STL files: arm_set.stl combo_top.stl combo_mid.stl combo_bot_trim.stl Assemble the hinges according to the instructions in https://www.thingiverse.com/thing:3407459. Before attaching the hinge pins, try pushing a long piece of 1.75 mm filament through all of the hinge holes to ensure they are clear. 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.