I always pricked my eggs with a sharp kitchen knife, but this can be a mess sometimes... so i designed this little buddy!
Just print it out real fast and drive a small nail through it and you are ready to go!

It does not need specific instructions. Just print it out in a resolution you like. 15% infill will be enough i guess.
If your nails wont fit through it, scale it up a bit. It prints really fast, so don't mind too much...

Ahh... and rotate it 180° before printing ;) And if the nail is too lose, a little glue is your friend (or just heat the plastic up around the nail with a lighter)