The first version is completely 3D printed. It has it's own base, jaws and springs. The second version uses springs out of Harbor Freight's spring assortment pack (200 Piece Assorted Spring Set). Again, this version has it's own base and jaws. 

Either model is very easy to print. I recommend 3 perimeters/walls with a 20% infill. Because this is for soldering using a material with high heat resistance is recommended. You can see in my included images that the jaws experienced melting. This was with PETG. 

Whichever version you choose, you will need 1 base, 2 jaws and 2 springs (printed or purchased).