Screw in leveling feet using an M8 bolt

This is an old model I made and used for several pieces of furniture. 

It screws to the bottom of the leg or furniture to hold an M8 nut.

An alternative design is to drill into wood to fit and hold the nut:

• https://www.printables.com/model/1314146-adjustable-furniture-feet-using-an-m8-bolt

If the legs are angled, the feet can be replaced by this ball-joint feet: 

• https://www.printables.com/model/1343635-ball-joint-furniture-feet-for-m8-bolt