Bladed Batarang
cults3d
I designed this to be the best letter opener ever A bladed Batarang with an integrated slit and holes for the insertion of a blade of your choosing. This batarang already has sharp edges with a clean design, but the addition of a blade makes this a dangerous item. I recommend cutting thin sheet aluminum for a blade, but I actually printed a sheet of PLA Filament about 1mm thick that worked pretty well, but PLA is brittle. I actually cut myself with the PLA, anyway. I use this often as my dedicated letter opener.
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