This PCB pillar is suitable for mounting standard 1.6mm thick printed circuit boards. The uploaded files are suitable for printing general purpose standoffs. However it is easy to modify the FREECAD files to add holes or adjust the sizes to suit other applications. This PCB pillar is easier to print than the standard round or hexagonal varieties. Very simple and obvious but I didn't see anything else like this already posted.

I used PLA with 20% fill.

Generate the GCODE for your own machine and print...