A&K SR-25 Kythera Spacer
thingiverse
My Polarstar Kythera was loose inside my A&K SR-25 gearbox (moving forward and backward). This shim goes behind the Kythera. Might work for other gearboxes with the same problem. I printed with a layer height of 0.12, but you could maybe adjust the exact thickness with the layer height.
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