I have had my TAZ 5 for a few months now. I have been recently having trouble with smaller more complex prints with pieces that snap together or are supposed to have a very tight tolerance. One of the items I was wanting to make was this from thingiverse: http://www.thingiverse.com/thing:586169 which is a combo lock box. Many many people have made this based on the “makes” section and I seem to be having trouble. The parts on this and many other small tight tolerance pieces come out very poorly fitting and require very very extensive sanding to get it to fit. The parts that I have made look to my eye as good quality without any obvious defects or poor printing characteristics.
I have printed a calibration cube from thingiverse (http://www.thingiverse.com/thing:271736) that is supposed to be exactly 20mmx20mmx20mm and it is slightly off. Measuring from the bottom to the top or any of the sides is approximately 20.15 +/- .03. The top appears to have a slightly proud lip around the edge that throws off measurements to something like 20.35 +/- .05.
I have only printed in Hatchbox PLA (this was done with yellow) at 205/60 for my temps. I should note I have made many large cosplay props and other items that just were flat glue together surfaces that came out great.
Is there any kind of calibration I can do to try to get more precise dimensional accuracy out of my printer so that I can print these more complex fitting parts? If any other information is needed please let me know.