Hello, the company I recently started at purchased a Markforged desktop printer last year, and the engineer at the time purchased Onyx FR filament, which is only compatible with their industrial printers. I noticed this last week when I went to reload the filament and found only Onyx FR, not the regular Onyx. I've asked customer service if we could exchange the spools, since the regular Onyx is cheaper anyway and our Onyx FR spools haven't left their packaging, but they said no. I can't seem to find any sort of platform to resell these two extra spools online. Is there any website you know of that is a good place to sell 3D filament? Thank you in advance