The concept with the 3 Volt power supply was it was regulated and did not need a dropping resistor to run standard LED's. With the strips, yes I know they are standard 12 VDC and the ones I found have factory available termination and power supplies. All from a US supplier and UL approved.
Ordering the T slot cutter tonight, as I already have a nice milling machine and table vise, now for wood instead of metal!