I've been getting a few really good questions over Facebook from a couple people about whether it's possible to build a Model C by ordering our pre-printed parts and then sourcing the rest of the hardware on your own. And the answer is yes, especially if you already have your own tools and want to experiment with your own hardware! In response to these questions, I thought I'd post this list of all the remaining hardware you'd need after buying a set of 3D printed parts:
6-32 Washer (x4)
6-32 ½-Inch Machine Screw (x22)
6-32 1-Inch Machine Screw (x2)
6-32 Nut (x38)
Self-Sealing Screw (x10)
Servo Screw (x1)
4-40 ½-Inch Machine Screw (x12)
4-40 Nut (x6)
2-56 ½-Inch Machine Screw (x4)
2-56 Nut (x4)
4-40 ½-Inch Machine Screw Brass (x4)
4-40 Nut Brass (x4)
We source all our fasteners at our local hardware store, and that'll probably be the most cost effective way for the typical ROV builder to get fasteners as well (unless you're buying in bulk).
Electronics and Other Hardware
Waterproof Thruster + O-ring main seal (x4) buy pre-made here, or order bilge pump motors on amazon to make your own
Forward Dome (x1) In our "Parts and Accessories" page
Rear Dome + Tether (x1) buy pre-made here or order a second forward dome, drill your own cable penetrations, and make your own ethernet cable - will also require a crimping tool
Internal Motor Leads (x4)
T-Plug Y-Harness (x1) will require 12 AWG speaker wire, as well as T-Plugs and soldering iron
Raspberry Pi 3B (x1) In our "Parts and Accessories" page
Female-Female and Female-Male Jumper Wires In our "Parts and Accessories" page
Raspberry Pi Camera (x1) In our "Parts and Accessories" page
9-Gram Servo (x1) In our "Parts and Accessories" page
12v-5v DC Converter (x1) In our "Parts and Accessories" page
T-Plug Motor Driver Cable (x1) You can make your own using two lengths of 14awg speaker wire, and T-plugs from our "Parts and Accessories" page
Dual Channel Motor Driver (x2) In our "Parts and Accessories" page
3S LiPo Battery (x1) In our "Parts and Accessories" page
WiFi Mini Router (x1) In our "Parts and Accessories" page
Power Bank (x1) Home Depot has a nice one.
SCUBA Shot (~3lb) In our "Parts and Accessories" page
Micro USB (x1) Cable Comes with the Power Bank in our "Parts and Accessories" page
Waterproof Ethernet Jack (x1)
Epoxy Local hardware store
Soldering Iron (x1) Local hardware store
Solder (1 spool) Local hardware store
Screwdriver Set (x1) Local hardware store
LiPo Battery Charger (x1) In our "Parts and Accessories" page
Pre-Programmed Micro SD You can program your own by running our Archimedes Software package on reboot from a crontab. If you're not comfortable with ssh, vnc, and unix programming (or don't know what any of that is), you can also order a pre-programmed Micro SD card from our store. Once you have that, just plug it into your Raspberry Pi and get building!
"Key" and "Key Plug" (x1)The key is the male side of a waterproof wire jack. A 12awg wire is looped from one terminal to the other and soldered into place to close the circuit. The key plug is the female side of this jack, and it gets soldered to the power bulkheads on the rear dome.
Overall, I think it's a lot less work to buy the kit as a whole, especially if you're new to in-depth builds and programming. It's also worth mentioning that a lot of the products you need are typically sold in multiples/bulk, so it may get a bit costly. That said, I know how intrepid you makers are, and totally understand the satisfaction in sourcing parts for yourself, so here you go!
I hope this helps you get exploring soon!