A big part of me just died. I printed at 0.25 mm layer thickness and 15 % infill, and after about 5 hours on my Replicator 2, I had my heart broken (just like the piece). The screw appears to be totally fused. The next bad move was to use brute force (sometimes you can't figure how much force you need to get a printed part moving).
Once I've nursed my heart, I'll be back again to print this!