Shoe Lace Lock w/locking pin (1.75mm filament)
thingiverse
After printing the original shoe lace locks I found that they'd come unlocked because of movement/walking. In my creative program, I inserted a 1.75mm rod into both pieces of the object to create a full length hole to insert a 1.75 mm filament as a lock to keep the two pieces from coming detached.
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