I currently have 4 racks that use heat rope. When I first switched to heat rope/cable, I was concerned that it would not work as well as flexwatt which I had used for years. It definitely does work as well, at least for me. I was warned about wrapping/coiling up any excess cable. I was told to not let the cable touch itself. This could lead to burn out. The insulation would melt in that area. So I would be careful about how you position it in the melamine.
I'm curious, just how thick is the melamine your using? Also, if you router a groove or space inside of each cage bottom, what are you going to cover it with?

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