In my projects i need a grid made of pipes.
The reason it is not in previous collection of grids lies in the fact it doesn't have a standard format, i'll simply allign a section of the grid to the holes, and i produced it with a different process, creating a lot of permutations, and assembling them like lego. As i devised the process i realized that it would have required minimal effort to make a "construction box" that can be used to create more or less straight pipes, or ridiculously convoluted and entangled circuits that aren't supposed or expected to make any practical sense if anyone bothers to follow the streams with their finger on the monitor.

I think the grid that i attached here is more than enough for my project, so i don't think i'll do anything else with those blocks in foreseeable future.