Cord Winder Plate for Cables and Extension Cords (parametric, with cord-lock slot)

A simple flat winder for keeping cables and extension cords tidy. Wind the cord lengthwise around the plate between the two rounded end notches, then press the cord end into the narrow cord-lock slot, which is sized from the cord diameter you enter so it is designed to grip the cord. A hang hole lets you hang it on a hook or nail, and an optional finger slot makes it easier to hold while winding.

Size, thickness, notch depth and the slot grip are all parameters in the OpenSCAD Customizer. Includes 4 ready-to-print sizes, from small USB cables to heavy extension cords.

One flat piece, no moving parts, no supports.

Safety – please read. Unplug the cord before winding it, and never use an extension cord while it is still wound on the winder (a coiled cord under load can overheat). Don't wind damaged cords. Not for lifting or hanging loads.

Notes and limits:

• How much cord fits depends on the cord's diameter and stiffness; not measured yet.

• The cord-lock slot is designed to grip the cord; how firmly depends on the cord jacket and your printer. Adjust slot_grip if needed.

• Do not wind a cord that is plugged in or warm, and fully unwind extension cords before using them under load (see Safety).

• Bed size: the 180 mm preset needs a bed of at least 190 mm and the 210 mm preset needs at least 220 mm.

• Previews are computer renders of the included STL files, not photos of real prints; the cord and plug in the main image are illustrative.

Included files: stl/cord-winder-plate_small-cable-90mm.stl, stl/cord-winder-plate_medium-cable-130mm.stl, stl/cord-winder-plate_extension-cord-180mm.stl, stl/cord-winder-plate_heavy-extension-cord-210mm.stl, cord-winder-plate.scad (OpenSCAD source with a Customizer panel), preview renders.

How to customize: install the free OpenSCAD (openscad.org), open the .scad, choose Window > Customizer, change the values, then press F6 (Render) and Export STL.

Designed with AI assistance: an AI assistant wrote the OpenSCAD code, presets and description under my direction. The files were checked automatically (watertight, correct size, prints without supports) but have not yet been test-printed. Preview images are computer renders of the STL files.