Does anyone know if there are any suppliers out there for filament that is thicker than 3mm? I am looking for something that is 5mm to 10mm.

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Ehh.... you mean plastic rod?

Cause at 10 mm thick, you no longer have filament, you have plastic rod.

It loses it's flexibility the larger the diameter, hence why filament falls out of the descriptor.

You can google plastic rod though and get all sorts of information about different types.
There's way more options out there beyond nylon, ABS, and PLA. Those three have prominence due to cost and availability, but there's something to be said for some of the other materials.

You can get plastic rod in length's up to 8 ft depending on the diameter and type of material you're looking for. Again, it becomes unwieldy because it's not flexible at that thickness, so it's probably not something that will be easily printed, but if you have some success, that might be useful in some applications.

Do you think that 5mm could be coiled up in a reasonable coil size (3-4')?

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You could make your own 5mm with a Filastruder.

If you plan to use a lot of it, it might make sense to build a machine to turn 3mm into 5mm by melting and re-extrusion.

There is no way that will be economical, I am thinking about going bigger but to do that we really need a standard larger than 3mm. The problem is balancing the diameter and the minimum coil-able diameter.

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