Post of a great value! I was also dealing with this problem of constantly changing the filters, but then I decided to buy a good dust collector. Best decision in my life! A little bit expensive, but it is worth the money. Searching for solutions, I have found a post on a website with many models and advantages and disadvantages of each collector, and this is how I bought my Festool CT 26 E. If you are interested, I can leave you that blog post with dust collector reviews. But the mechanism you created is simply genius! Thanks!