Twist-Eraser Refill Adapter
thingiverse
Adapter designed to convert eraser refill intended for electric erasers into Pentel twist-eraser mechanical pencil compatibility. Suitable for commonly available cheap erasers measuring 5 x 25mm, easily sourced from Aliexpress. Scaling may be necessary due to printer accuracy; I've included a scaled-up STL file by 10%, which worked perfectly for my purposes.
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