I just designed and printed my first functional part with my Bambu A1 printer. About to wire it up. I'll report back soon.

Update: I used two14500 3.7v batteries. I added these 12 mm AA nickel leads from amazon. Then put together with this BMS module.

The first time I used these leads in a longer cassette housing, the leads glowed and deformed. The current version is 4 mm shorter to hopefully compress the coil enough that the resistance is lower.