The base model of the keycaps used on many of the Logitech G keyboards, reuploaded from Thingiverse. To my knowledge, this does not apply to any of the bigger keys due to Logitech's design.

For people looking to use it to put decals on, I highly recommend rotating the decal on the X axis by ~8.5 degrees.

Thanks to sl1zer on Thingiverse.