The cost of Philadelphia Eagles' paraphernalia is on the rise as they are on their way to the Superbowl! Print your own rather than buying on Amazon for 300% the normal price!
I printed these on 5 different printers with 0.4, 0.5 or 0.6 mm nozzles. They are all very easy parts to print. I'd recommend 0.15 mm layer heights for the spacer and football beads, and the clasps. The rest can be whatever layer height as the side walls on all the parts are vertical. A higher infill is going to give the beads more weight to droop down on the neck better. If you want a shorter necklace, 60% infill may be better, where a longer necklace may look better with 25% infill lighter beads.
My boys used regular string from the craft store (or "Embroidery Floss"). Like this: https://www.amazon.com/Premium-Rainbow-Color-Embroidery-Floss/dp/B016HUI756/ We used a paperclip to feed the string through the beads, as the Eagles and football beads are long compared to normal beads.
EaglesClasp.stl is thinner and easier for kids to use. EaglesClasp2.stl is more robust, but it will be more difficult (esp. for kids) to clasp/unclasp. If the necklace is big enough to take off over your head, then I'd use v2.
The Letter beads come in two flavors. Version 2 has the string hole higher up on the bead so it "hangs" more. Version 1 is closer to the center for a different look, but this can cause the beads to flip around more easily.
The Eagles bead is a remix of: https://www.thingiverse.com/thing:1778737 The others were drawn by me in TinkerCAD or OnShape.