Little piece to put recycled PET filament from PET Machine (designed by Igor Tylman) to a piece of string to assist with filament pulling.

Use a short M3 bolt to squish the filament in one end and any appropriate string for the other.

Print with 100% infill, I used recycled PET filament to print it but any filament will do.

NOTE: Be careful not to tighten the bolt too much as it could split the piece along layer lines