Felt Mat Corner Holder
thingiverse
Holds a 3.5mm to 4mm thick felt mat, like those sold by Grovemade. Designed specifically for 3M Command Strips to hold in place, one strip will handle two of these corners (I only needed two to hold the back of my mat in place as it always slid back). You can make your own for different thicknesses by remixing my OnShape (linked).
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