Version 2 of the soldering clamp I made.  This version has a replaceable tray for the drops or junk that might fall off.  Easier than reprinting the whole clamp.
 

NOTE: Depending on your filament, if you want the tray to be a snug fit, you might have to increase (or decrease if too big) the x / y dimention on the tray.

Clamp to hold various wire sizes allowing the leads to be more easily soldered together.  Print this out of PETG, Easy ABS, or something a little more heat resistant than PLA.  Having said that, it was purposefully made easy to print as those who do print from PLA or even PETG will likely destroy it after a while if they touch the clamps with the soldering iron.

The model is designed for actual springs or printed springs.  I wanted something stiffer than print in place springs so I used 0.7 x 7 x 25mm compressions springs (can be found on Amazon).
 

Easy, quick assembly.