ideal PG35L, custom spec ?

The PG35L are nice geared steppers (search for the tag pg35l on thingiverse)

But today I could talk with someone from e-minebea, I was just asking for a price and they offered to eventually tweak the specs of the motor to better suit the application.

That make me wondering, the standard PG35L-048 (or D48) works ok, but if we could change them, what would be it's ideal specs ?

(I don't know how the inductance/resistance/etc. play in the motors capacities, but by example wouldn't it be possible to keep the same torque or almost, and lower the heat ? Avoiding the necessity of an added fan)

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