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Yes, it is possible to use a permanent ink felt pen to correct any errors in the transfer process, and you can also draw the circuit from scratch if you're so inclined, it's just a lot more precise with the transfer method.
Assassin's Creed Hidden Blade - Functional Prop!!
Cat Adventure and Escape Wall
4-Player Pedestal Arcade Cabinet for MAME
Mini Pi-Powered Arcade Machine
Heatless (cold) Toner Transfer for PCB making
Make your own Bleach Cosplay sandals (waraji)