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.
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.