So while an actual FOTK build is still a ways away, I decided to try and make the blaster, with details below. Given that I started printed this in March and have slowly been working on it since then, I'm hoping to have it done soon, with most parts already painted and somewhat assembled.
Build comments: For this project I printed each piece, painted them all with filler primer, with the help of my fiancée sanded them at 400 and then 1000 grit, and then painted them. I realize this not involving Bondo means there will still be some print lines, but I'm honestly alright with this as this gun was one of the reasons I wanted to get into 3D printing in the first place, so it's a nice learning experience (though not my first build, as I printed two DC-17s for a friend).
One crucial mistake I'd say I made here was not using good masking tape. I used blue painter tape for everything at first, which worked reasonably well but wasn't quite perfect. On my second attempt, I used Frog Tape (an all green painter tape that I found here in Ohio) which was far better for the painting process. Another mistake was definitely being impatient with printing. With over 50 pieces, I was focused on trying to get them printed as quickly as possible, and in the process neglected the quality on a few pieces. I wouldn't say they would impact the final result, but definitely required a little sanding / dremeling to fit properly.
Printer: Ender 3 Pro
Material: Inland Tough PLA (I know I could've gone with something tougher, but at this point the gun is meant purely for display. If it needs replacing with tougher parts, I'm prepared to do that down the road.
Files: The 5th Horseman
Binding Agent / Glue: E6000 - I know that some have said plastic welding was the best option here, but I find that this works reasonably well.
Flashlight: Streamlight 73001 Nano Light Miniature Keychain LED Flashlight
Ammo counter / magazine lights: 3 LED Headlamp (I saw this on the FOTK facebook page - can't be too specific as I can't tell the brand)
Scope lenses: I cut up some of the plastic that the main underbarrel flashlight arrived in and glued these parts to the scope lenses before completing scope assembly.
Custom parts: I used a different front trigger made by another FISD member who's name escapes me. I also made a few small parts to go on either side of it to prevent the trigger from moving sideways along the pin (which itself was from a large binder clip).
Unpainted printed parts:
Rough fit of some of the parts:
Main receiver / stock rough fit (I realize these look gray in the photo but they are actually white already - Rustoleum Gloss Protective Enamel White to be specific):
(Mostly) Assembled stock:
Completed underbarrel portion: (This required additional dremeling compared to the originally intended Aimkon flashlight which I was unable to find)
My next step is to finish painting Scope Mount 1 (Which has given me issues due to its small size making painting details a little difficult for me), assembling the handle and rear folding stock units together (This required some dremeling after I thought it was all done so that the rear trigger would be useable), and then move on to hopefully the last bit of glue before final assembly.
Bonus rough fit DC-17 pic for reading through a newbie's build thread: