A headlamp holder built to be compatible with some 1W LEDs I had lying around at home and rechargeable lithium-polymer accumulators, so that there is no need to swap out one-use batteries which may be hard to find. The holder at the front is for the LED, the one at the side is for the battery and charging circuitry.

Print instructions

Supports might be needed at the battery holder. FLEX filament might be a good idea so that the battery and LED is easier to fit and for general fit around the head. It should be possible to route the power cable through the band itself if printer is paused in the middle. Keep some space in the battery compartment for a switch.