File binding rail
thingiverse
File rail for binding stack of documents. Print part 2 times and assemble them together. Apply some glue and hammer them slightly for secure connection. Next just slide rail through documents. You might need some glossy and stiff 1st and last page, so they won't rip during sliding. Comes in 2 versions with wider or narrower margin for binding 50, 75, 100, 115 paper sheets.
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