A 3D printer is pretty crucial to this project. If you've never printed anything before, this would be a a good project to start with.
Printing with a raft is totally your choice, but I've found I have the best success with my Replicator 2 when there is one.
Take your time when removing the raft. The cleaner you can remove the extra material, the less cleanup that's required. Since this print will be near skin, you'll want the bottom surface to be smooth and free of any jagged edges.
I used a scribe to widen the monofilament holes a little.
Next, print the inverter clip. I used black filament, to blend in with the inverter.
Now to move onto assembly!