When I started 3D printing back in 2019, my first major project was an Eclipson BlackWing 160. This model printed out cleanly and the parts fitted quite nicely. This was done in October 2019. I didn't pick up the model again until April 2020, unfortunately none of the parts fitted and were quite warped by being stored in a damp cold shed over the winter. Recently I looked at the BlackWing again, and wondered if it could be printed with lightweight PLA. I emailed the designer and asked the question, I didn't expect an answer, but I got one twenty minutes later. With reservations it was possible. Now here I am, after 40+ hours of experimental printing, watching the first (apparently) successful part of the BlackWing being printed. After so many previous prints had failed due to poor finish or excessive "zits" on the outer surface, I emailed the designer again. The reply was almost instant, a setting which I didn't know about needed to be adjusted. The default setting value was 0.067, the new value, which seems to be working, is 0.0. Strange how tiny increments can have such an effect on the appearance of the finished item. Its a bit like having a model that is difficult to fly, turned into a pussycat by just one click of one trim switch. I'm keeping my fingers crossed that the present set-up will work for the rest of the parts. One unfortunate aspect of using LW-PLA is that it continues to expand during moves from one part of the print to another, this makes "retracting" the filament between non-printing moves, ineffective. The wing section being printed has a fairly clean interior at the leading edge, but looks like a relic from a shipwreck at the trailing edge where there are lots of stops and starts due to the assortment of internal stiffeners.