Learn Solidworks advanced Sketching @ANSOL Working with different types of Solidowrks sketches, there are three types of sketch we deal in Solidworks. Types 1: Open sketch is that in which entities never make a closed loop. Type 2: Closed sketch is that which has ne closed loop. Type 3: Nested sketch has more than one closed loops. We can use Solidworks Thin extrude with open sketch. Normal extrude with closed sketch. And use Sketch contours with nested sketch. For more advanced Solidworks sketching tutorials, please subscribe. www.youtube.com/ansol