Magnetic Pen Holder
thingiverse
This is a basic, no-frills magnet-backed holder designed for pens/pencils up to Sharpie size. The cavities in the back are set up for 36mm diameter x 7mm deep magnets, available at many hardware and hobby shops. The center hole is 4mm, designed to be (carefully) tapped for M5 x 10mm screws.
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