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    Oh and by the way: welcome on board on the Teensy...

    Oh and by the way: welcome on board on the Teensy side!
    I come from Arduino, too.
    Teensies are little marvels, true gems! Cannot thank Paul enough for his incredible work.
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    I like MP1584-based regulators....

    I like MP1584-based regulators.
    https://www.monolithicpower.com/en/mp1584.html

    Cheap, stable, energy efficient (personally measured: 88% with 12V in 3.3V/0.6A out), OK up to 2A out without...
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    Just to be on the safe side, I'll add this: while...

    Just to be on the safe side, I'll add this: while having external modules powered by 3.3V is (in general) safe with the LC (provided GNDs are connected together), having external modules powered by...
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    In general, yes, you are absolutely correct:...

    In general, yes, you are absolutely correct: regulators usually drop between 0.2 and 0.7V.
    But from experience, Teensies seem to have some sort of regulator bypass when VIn drops below say 3.5V, so...
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    Stepper motor drivers tend to need a lot of...

    Stepper motor drivers tend to need a lot of current, so powering them from the LC does not sound good.

    If you power the LC via VIN with VIN-USB cut, you should be able to supply 3.3V at VIN...
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