All Files Free on Thingiverse : https://www.thingiverse.com/thing:613...

After many years in the roofing trade and having cleaned out for over 35 years, I consider this to be on balance the best way to "stop" blocked pipes and overflowing guttering. Potentially saving masses of waste and money. Dirt, moss and tree leaves can quickly overwhelm traditional on the market solutions, this is my version.

I think this is a commercial grade product superior to anything else on the market if fitted correctly and probably the only thing I would consider fitting myself.

I am giving my idea away100 percent free to use, print, share, modify or manufacture anywhere in the world by anyone. Some users are already modifying this to better suit other countries like the USA like this user - https://www.thingiverse.com/thing:654...

My original STL and 3D files are set to UK specification domestic size. So if you want commercial sizes or outside of the UK, you will have to modify and share your changes with the community. Just make sure the final printed size will not go down the pipe!

I have looked and cannot find any design quite like it. But if I have stepped on anyones toes with a patent please add Thingiverse directly. But maybe you should have released the product or should do so rather than sitting on patents.