Herman Miller Aeron Chair Arm Support

a gently remixed armrest support

I need to take apart the armrest lock on my Aeron, and tighten it up, but I keep not doing that.  this allows me to continue not to bother.

I made a few changes to make it more pleasant to use, and I added a larger size to get it within a couple millimeters of the absolute top of the armrest range.

one tradeoff in this is that this version takes about twice as long to print as the original version.  it's still only about half an hour to print one, so it's not that big a difference.

printing should be easy

I fixed the orientation in the Fusion model to fit my changes, so — although Orca's auto orient did work — changing the orientation shouldn't be necessary.

I just printed with my normal settings: 3 walls, and 5% sparse infill.

further remixing / if you need a special size

I included the modified Fusion file, as well as STEP files, so further modifications/special sizes should be easy.

N.B.: one feature is suppressed.  it's a fillet, and it rounds off the top inside corner (as installed) to make it possible to force in longer spacers.  

for shorter spacers, you can just lift the armrest, and then lower it onto the spacer.  if you can't raise it enough for that to work, you need to unsuppress that feature to activate the fillet.  the edge chamfers should flow with it correctly.

you might be able to force in a 96 or even 97mm spacer, but you'll probably have to increase the fillet radius a bit, and — even then — use some persuasion.  95mm was tight, and it's close enough to the top for me.