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Being honest, I don't have a really good method right now. I dust off my rigs every 2-3 weeks with compressed air (after letting them cool down - don't hit anything with compressed air until it has naturally cooled or you'll risk breaking it). I did actually see this really good idea on YT where a guy had made enclosed wooden boxes for his rigs with a top-mounted extractor fan and filtered air intakes at the bottom. I have linked the vid below in case you want to take a look. I'm thinking of building something similar because the shed I keep the rigs in build up dust FAST and it is a pain to be honest. The heat is another thing altogether too.... I'm hoping to try and kill two birds with one stone with the solution to the dust problem. Will most likely update the blog if I do!

Yes yes yes you are right!!! Compressed air! I never think about that... I used to... just blow! lol, I'm going to buy a small air compressor!
Thank you so much for sharing! The video you shared is also pretty nice! They guy had an excellent idea!