This is bed light Looks Like small moon 

components -

1x button led

1x 18650 lithium battery

1x tp4056 battery charger module

2x m4 screw

Printer settings -

0.4 nozzle 

10% infill

NOTE -

Here I have not included the hole for the button because it can placed any where or can be used with direct power supply ,make a hole for button if required