Remix of VoyMakesMinis' Necron Obelisks (or Objective Markers) found here: https://www.printables.com/model/470609-necron-obelisks-or-objective-markers
I hollowed their model with supports to be able to house an LED and resistor and paired it with my own 40mm base with battery housing.
I've included the little support tower I printed to fit the LED on but truthfully I would probably use some toothpicks if I do it again, the legs broke multiple times before it was all done.
Should not need any supports though you might find a brim helpful.
Remixed in Tinkercad
Update:
I've added the other Obelisk from VoyMakesMinis' now also hollowed out. To Print this one successfully I had to break it into 2 parts. The Middle can be printed lying down and the 2 halves of the outer shell can printed upright, they are joined with supports to cut after printing. You will likely need to glue these in place so I recommend priming and doing any other spray painting before assembling with LEDs to avoid covering your lights with paint since they will be tough to mask after assembly.
The author remixed this model.
Hollowed the model to take an LED and allow light through.