Adapter to fit Xenon or LED bulbs in H1 Bulb socket. Some bulbs may require additional spacer between the bulb and adapter as retention-arm may not push far enough into socket. Will be uploading versions with extended sections on the adapter to more securely hold bulb in socket for cases where retention-arm will not be holding bulb far enough in with the current 3mm adapter thickness. Might work best with a high shell count for most possible strength and max infill, but test to see what settings work best for you. Low filament use print so no need to worry about high shell count, the denser and stronger the better. DISCLAIMER: Print this in PETG or ASA (or other UV resistant filaments) if intended to use in automotive applications, PLA, ABS, etc, will have too low UV resistance and will not be useful materials for automotive applications and break or deform over time.