Cat spikes
thingiverse
Simple grid to print and lay down in areas where you don't want cats going. This is an OpenScad model, and you can adjust the thickness of the spike bottom and the spike top. I just started experimenting with this, and not sure what to make the top so it isn't sharp enough to puncture. I am guessing 0.5 mm. You can also adjust the spike height, grid thickness, and the number of cells in the grid and other dimensions. I am going to be using this on a mantel to prevent delicate items from being broken. This is designed to be easily clipped to fit objects into, but be sure to secure it down as otherwise it can take everything down with it.
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