In contrast to many other IKEA Lack hacks here, this' intention is simple to raise the table height of an IKEA Lack.
Therefore print the raiser 4 times and slide it over the feet.
Depending on the direction, you can choose between 2 different heights: 30mm / 60mm.
Please be aware that the table may tilt more easily and also I didn't test for heavy weight.
IKEA_Lack_Leg_Extension_SMALL.stl | 2.2KB |