Miếng đệm trụ bàn gấp piano

This is a very basic design to replace your piano folding table cylinder pad, ensuring it won't lose balance. In case you want to personalize and replace all of them, it is recommended to print it in TPU. If it's just one, probably any material will work.

The inner diameter is 30.5mm to fit snugly in the original tube.

EDIT: new version added to the model with grooves.