I love the adjustability of quality office chairs, but couldn't quite justify the price tag for home. This part adjusts the arm of my chair up,in,and backwards.

The photo was for an offset of [60,-60,50], I found this to be a bit too much and re-printed with [30,-40,40], which also worked well. Note that if using the .scad you need to either mirror the part in your slicer or create two, one with negative-y and one with positive-y offset.

Designed for Tilcott Desk Chair 53307/53308 but is customize-able for any chair that uses two inline bolts to connect the chair-arm upper.