Coil Extension Kit for a 1/4 inch plastic sewing Bobbin.

This is a coil extension kit for a standard 1/4 diameter plastic sewing Bobbin. You can wrap Magnet Wire around a standard sewing Bobbin to create coils. These parts allow you to wrap more Magnet Wire around a standard sewing Bobbin to create larger wire coils for your experiments. The 3D printed coil extensions snap onto the plastic sewing Bobbin and the spacer is placed between them to keep the fins apart.

These 3D parts were designed using the free software package eMachineShop.