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Anonymous
>>55900 The red lines means the polygons aren't connected properly. Like you did, Pepakura can fix this up to a certain degree, but the rest seems to be too far off for Pepakura to fix. You need to fix this in a 3D modelling program BEFORE importing it in Pepakura. And unless you're making a simple cube, the auto-development isn't very useful: you need to set the cut and fold edges yourself. No tutorial can really learn you a good way to choose the cut and fold edges: it's a matter of logic thinking in 3D model -> 2D template -> 3D papercraft and TESTBUILDING. Once you finished, print it and try building it yourself: you'll likely find some problems you will need to do differently to make it a better papercraft (make notes). Fix it and repeat this progress until you're satisfied.
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