This is a remix of mistertech's excellent Soldering Fingers that add's holes to fit a 5mm and 3.5mm LED snugly, and also adds a hole that you can feed pins through (like the resistor in photo).
The pin hole is loose, but you can bend the pin legs on the opposite side to have things held in place (I tried to make it smaller, but my printer would close the hole when printing any smaller). LED's are held in place snugly.
Edit 10/28/17 - I've uploaded a "Snugger" version for higher resolution prints. My original one I printed at .2mm layer height and it held 5mm & 3.5mm snugly, but when I printed a 2nd one at a .1mm layer height, the holes were a little loose - so I made the holes a tad smaller for .1mm prints.