I would like to fab some custom LEDs Assemblies.
Embed a resistor in the plastic, is there a smart way to go about doing this?
I know Alibaba other than that nothing really.
Custom plastic could be expensive. I would find a lens you like and fabricate a small PCB with an SMD resistor and SMD LED. Glue the lens to the PCB. Add two pins for the external connection.
If all you want is a led with a built-in series resistor, I believe these are available already.
How many? For anything less than thousands it would probably be cheaper to solder a resistor to an LED and pot the whole assembly in acrylic