This is a 3 part universal furniture riser set. It consist of a top piece, the middle expansion piece and a bottom/boot piece. The middle expansion piece can slot into itself so you can technically make this riser as high as you would like / feel comfortable with. The riser with the foot piece and the top piece gives a lift of 38.5mm (About 1.5 inches) and each extension adds another 24mm (About 1 inch). So all three pieces combined is about 62.5mm or about 2.5 inches of lift. 

Printing:

I've printed the middle piece and the top piece inverted as the supports give the model a nice rough finish to better grip the furniture. I'd suggest printing the bottom piece in TPU, although it's not necessary. 

You must print a Top piece (Plate 1) and Bottom-Boot piece (Plate 3) in order for the riser to work. You can print as many middle extension pieces (Plate 2) as you need, each piece will raise the height by 24mm (About 1 inch). 

By default the 3mf I've provided is a 15% infill for PETG, you would probably want to raise the infill to 75% for a bed or a couch. 

Assembly:

The top piece can slide directly into the bottom piece or the extension. The extension can slide into another extension or the bottom piece. You can see in the image above I've color coded them, Top is Grey, middle / extension is gold / bottom is red. The tolerance between pieces is tight and they will pop tightly together. If you want to separate the pieces after your snapped them together, you will most likely need to use a flat tip screw driver or a spudger.