Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4758861.
Update 03-05-21:
Uploaded new version of the arms that allow 9mm and 12mm motor mounting patterns.
This is the "Discovery" long-range frame. It is a strong redesign of the #minilongrange frame from Dave_C The goal was to design a frame that would fullfill the following conditions:
4" inch size (in my view the best compromise between size and flight characteristics "one level design" 3s li-ion battery setup light-weight, yet stable
I design frames for fun - each one goest through 4 phases, which are documented on Youtube. There you can also find lots more details about the frame:
Concept: https://youtu.be/MWxd5NSIigg Design: https://youtu.be/k2EgaUF_MBU Construction: https://youtu.be/Mm42wYFyWIw
You can find videos from all my frame design projects on my Youtube-Channel: https://www.youtube.com/c/eyeflytinkerings