Found a huge dupe. Please dont read if you are not developer! Do NOT CREATE YOURSELF A TEMPTATION
One player of our server, ipcraft.pro, found some terrible dupe bug.
Here's the explanation.
We must take an ender garbage bin and any fluid pipe.
After this, we want to pur some fluid pipe connected to that bin, so we shift right click bin with the pipe.
And after we done, we see that we put pipe at the right place. But we still have that pipe in the inventory! So we break it with a wrench, dupe another and another...
Its easy dupe of any not easy obtainable resourse like tungsten, titanium, aluminium, stainless steel... Cause we can smelt those dupped pipes.
tested versions of gregtech: 6.05.45, 6.05.48