These are created just for fun.
They would be the bolts needed in special situations like having drilled the hole twice, off center, too large at first ect.
Each file is named with a description of how the bolt would be used.
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Some of these need to have support material added to be able to print.
Try and block the supports on the threads to make your life easier.
These were modeled based on images of posters found online, they were all done in Fusion350