Ikea Lack Leg riser, low profile.
It rises the table 12 cm, space enough to accomodate a BambuLab A1 mini below.
I wanted a real sturdy Ikea lack riser and all the models I found where either quite high profile with external reinforcements or quite wobbly. The problem is that all of them use screws on the board part out of the leg, that is cardboard or even thin air. 
This design is quite sturdy.

Each piece is firmly attached with 4 screws to the part of the board that is chipboard made, where the main screw for the leg is originally attached, so is as firm as the original one.
The screws are hidden inside de piece.
The other side of the piece is screwed with the original Ikea screw to each leg.

Additional parts needed:

-16 countersunk self tapping screws 4x35 mm.