On 12/13/2020 2:03 PM, John Doe wrote:
...
I hardly use the thing, unlikely it's from normal wear. It has gone through
three or four blades, about one per session of light use.

I usually cut small pieces of 1/8-1/4 inch thick aluminum (6061).
...

That is extremely unusual. My 1st guess would be cheap blades. You
don't need bi-metal for aluminum, but don't cheap out either.

2nd guess is operator error. Most likely is twisting the blade in the
cut. Around either axis - I hope you get what I mean 'cause it's hard
to explain. Thinking about it- this is more likely the problem than
blade quality.