I recently broke my 300x Tail Fin when I lost my orientation against a dark sky. This is my first design and it fits pretty well. It is not perfect, but it will get the job done. Time Flys refers to my local hobby store, http://timeflyshobbytown.com Without my RC experience, I probably would not have gotten into 3D printing.I printed with MakerGeeks Ultra PLA at what I consider a medium speed using .3 mm layers. I have two solid bottom layers, 2 layers with 20% infill, 2 solid top layers and one layer for the text. They take about 10 minutes for me to print each. 30 minutes for a tray of 3. There are some small gaps around the top loop. I ended up using a 5 degree angle on the rectilinear fill for the best results.