Here is a very simple method.

1. Get 2-3 Tablespoons of acetone, place in glass jar.
2. Get a piece of wood, place it in the bottom of the jar with the acetone, you are using the wood as a base. The wood surface needs to be higher than the surface of the acetone, we dont want the bottom of the model to get wet.
3. Place the glass jar on your hot bed of your 3d printer, heat the hot bed to 110c, wait a minute.
4. Place the 3d printed object in the glass jar on the piece of wood for about 10 seconds. Pull it out, check it if it needs more repeat for 5 seconds at a time.