FrSky S6R Calibration Block
thingiverse
I have around 15 of these receivers and I find it easier to calibrate/re-calibrate them as I move them between my planes and before they are mounted inside the models. You can insert the receiver into the block and power us via esc and then do the six different sides laying flat each surface without the wire or antenna getting in the way. Simple, effective and easy to use. I printed using only 10% infil (gyroid) and 3 layers all round, fits nice and snug and you can see the calibration light easily. Weighs just over 18g.
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