Hi, we have improved the print quality since the first attempt, we have found the printing problem was the ir sensor (slighty crooked), but still have issues with the chimney in the benchy. In the image attached, the first attempt was in original size, there is excess of plastic in the hull. The second one, same as the first but 50% of the original size, a bunch of plastic in the hull, bad chimney and plastic shavings. We have corrected the ir sensor and the result is the third one, have a little imperfection in the hull (without excess of plastic), but still getting shavings and a bad chimney. The settings are used: PLA temp 220 Bed temp 60 100 microns 30% infill And have changed the z axis voltage to 0.45v Any ideas? PD. Thanks in advance and sorry for my crappy english.