I have had fairly good luck printing parts so far with my new Taz 4, but have noticed that everything seems to be over extruding a little bit. I’m getting good precision, the results are fairly predictable. Walls tend to be ~0.2-0.3mm thicker than designed, and holes tend to be ~0.2-0.5mm smaller than intended (worse for smaller holes). Since it’s been predictable I have been able to compensate for the error in parts that I have designed, but it does limit my ability to use an existing design when I’m able to find something that meets my needs. Screw holes are the real issue!
I seem to have had the best luck running the hotend at 180 degrees and the bed at 50 degrees (default for PLA). I took several measurements of my filament (purchased at Microcenter) diameter with a caliper and am using that value in Slic3r.
Should I be expecting to get better dimensional accuracy? I know this thing isn’t magical so it’s expected that there will be some tolerance that I have to design around. But if there’s something I can adjust that will make things better then I’d like to know how! I’ve considered telling it that the filament is thicker than it is, which in theory would result in it extruding less plastic per mm of commanded extrusion, but I’ve never been a big fan of arbitrary fudge factors without understanding the mechanics behind the decision. Is there a more elegant way to get at it? Preferably something I could calculate based on the known over extrusion!