Magnetic Ruler Mount
thingiverse
I previously had a ruler mount/holder that wasn't perfect, so I designed a new version that's much more efficient. This one allows you to magnetically attach a ruler directly to it. The compatible magnet size is 20mm diameter with a thickness of 3mm - you can purchase them here. A small hole in the mount lets you install it on a wall, door or any other surface. If you appreciate the designs I publish for free and want to support me, consider using my AliExpress Affiliate Link when making a purchase from AliExpress. It won't cost you anything extra but will greatly help me out. The link in this post is an affiliate link.
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