I hate rotastack, it's all about humans and not animals. I would really hate to be a hamster cooped up inside that smelly plastic crap.

As someone else says, stick it on ebay & donate the money to a shelter or to a local small animal rescue.

Not sure about selling it though in case someone tries to use it just as it is despite the warnings, -a neighbour was going to get rid of it on freecycle and I didn't want a poor little hammie to suffer.

I don't know why someone would want one of these 'cages' anyway they are impossible to clean from what I've heard. Maybe sell or donate the usable pieces and bin the rest.

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Another option, rather than sell and donate the money is donate the stuff to RSPCA. It's not great but the one near me was using a (in fairness quite big) rotastak cage for the mice they had because they rely on people's donations. I know it's not ideal but the RSPCA often are rescuing animals in much worse conditions than a poorly made cage e.g. abandoned animals that are on the brink of survival. And it's usually a temporary arrangement.

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You could always find someone you know uses it well and offer it to them rather than binning it. Or, as suggested, offer it to a rescue as emergency housing and transport cages.

I use rotastak myself and I think it definitely has it's uses. I have a whole bunch of it attached to a large tank for my gerbil and she loves it.
I won't be keeping any more gerbils after she dies so I'll probably give the whole lot to someone who I know would use all of it and bother to clean it.

Thanks for all your suggestions, I will take it to the RSPCA