Question: knights of the old republic how to make lightsaber?
Answer:  Go to the crystal cave for your crystals (color and <Full Name> crystal).
 Go to the Enclave. ... 
 Rescue Jorran (Pick up the Farm Equipment Subquest at the City Hall while your at it). ... 
 Finish the Farm Equipment subquest and as a reward, the guy will give you final lightsaber parts.