I learned about 1 - 2 - 3 blocks from a friend of mine when I first started with RC airplanes and have been using them ever since on my builds to get straight edges, angles, etc. I have even used them in multirotor builds.
This video explains what the blocks are and how to use them when cuttom foam for your favorite scratch build. You can purchase them online or locally from a tools supplier. I got mine from Amazon.
Enjoy!
RCJoseB
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