I've been fighting this issue alone for too long, it's time to give up and ask for community help. So I have e3d genuine titan, (genuine) v6, and (genuine) pancake motor all connected in direct extruder (tube size is perfectly cut as per instruction, "a tiny bit shorter rather than longer".) I use Marlin, my x, y, z, e steps are calibrated using 0.02mm precise caliper, PID auto tuned, x, y, z are fine tuned using caliper as well, bed UBL auto leveled, belts are tight, recommended 0.48mm line with, 0.25mm line height (doesn't really matter, I've tried various combinations) there should not be any issues, and there's no with walls, they look awesome... but 100% infill and top layer look like at least 2x over extruded. How a hell it's even possible??? If I try to work around it with flow multiplier, I got gaps between wall lines. Again, without any tweaking prints sizes are not more than 0.2% different from intended. And walls seem absolutely normal as for me. So at some point I started blaming slicer. Apparently I was wrong, again. So Cura with my settings - the same issue, with default settings - the same, Slic3r - the same, IdeaMaker - the same, different filaments - the same, abs vs pla - the same, different temperatures - the same, disassemble and assemble - the same, different speeds - the same (10-80mm/s), accelerations down to 1500mm/s^2 - the same, different nozzle (confirmed to print well) - the same, linear advance K=0 - the same, any non-zero - the same. Bottomline, for $150 setup, it's doing very bad so far, it's so frustrating. I'd appreciate any ideas, otherwise I don't have any choice but dispose it, and never buy from e3d again. Thanks in advance. PS: I measured filament, it's 1.75 straight.