Xbox 1 LB/RB combo shoulder button
thingiverse
This is an enhanced version of the 2-button Xbox 1 shoulder button piece RaffoSan posted in his comments for a replacement. I added a groove in the middle to allow it to sit securely on the plastic supports, and I widened slightly the two holes that fit onto the faceplate. I had to further widen the inside gap to accommodate the controller. I might post an update here later, but we managed to get it fitted onto my roommate's controller. It likely only needs a slight expansion of about 0.5 mm or so; your results may differ.
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