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Extension Cord Plug Separation Keeper
A 130 x 44 x 6 mm plate that keeps an extension cord and a tool cord from pulling apart at the plug. You push a loop of each cord through an 11 x 26 mm slot and hook it over the notched end. The slots take two passes of cord up to about 10 mm across (16 AWG to 12 AWG SJTW), so a tug on either cord pulls on the plate and not on the joined plugs.
Flagged: mains electrical wiring. Not for safety-critical use without independent engineering review.
Print-In-Place Flexure Cord Lock
This print-in-place cord lock replaces the spring barrel stopper that rusts or snaps on jackets, bags and tent lines, and it works with 2–3 mm cord. Pressing the 4 mm button lines up the 3.6 mm cord holes. When you let go, two 13.5 mm printed leaf springs push the slider back so the holes sit 2.6 mm off-centre and pinch the cord. There is no metal spring to corrode. The frame is 26 x 40 x 8 mm and has 0.5 mm clearance on all sides. PETG gives the springs the longest life.