A-Mazing Box with more clearance
by pogden, published
When I printed wizard23's A-Mazing Box, The penultimate horizontal channel was too tight for the nub to pass through. Upon inspection of the source image file, I found that the top of that channel was too light, I've darkened it and regenerated the model.
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Print the stl.
Alternately, I've uploaded the image ued to generate it and the intermediate openSCAD file. Other than that, follow the instructions from thing:1481.