3
Any custom pcb that requires a atmega32u4 soldered directly?
(lemmy.sdf.org)
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With how cheap those chips are I'm not sure I see the value in sending it to the manufacturer.
I've also never seen a PCB that has the atmega built in show up without that already installed. If you want though you could find an open source board design you like and order the PCBs yourself without components... If you're up for the challenge.