Add these to your folding table legs to increase the table's height. A STEP file is included so you can customize to your needs. The simple design is based off of the “Lift Your Table” risers. I'm currently using them for these foldable tables (both the 6' and 8' bent leg versions).

To ensure extra strength, I printed the sleeves with 6 walls and 30% grid infill. I just used PLA and am happy with the sturdiness, but of course using ABS wouldn't hurt. The feet are printed in Overture TPU and pop right onto the bottom of the sleeve. I didn't use any adhesive to secure the feet but you can if you'd like!