To maintain your Ultimaker 2 correctly and keep it running smoothly it is recommended to lubricate the axles once in a while.
When you notice small ridges on the surfaces of your 3D printed objects or feel that the X and Y axles are dry it is advised to put a single drop of sewing machine oil onto the X and Y axles. This will help your Ultimaker 2 running smoothly. Sewing machine oil is not included in the Ultimaker 2 package, but we highly recommend to only use this for lubricating the X and Y axles.
Caution: Don't use WD40 as this will affect the coating that is on the axles. We advise to only use sewing machine oil for oiling the axles.
Z trapezoidal leadscrew
Once every half year the Z trapezoidal leadscrew has to be lubricated with Magnalube. This is the green grease that was delivered with your Ultimaker 2. Make sure to spread 10 drops of grease over the entire threaded rod. With your next print the Ultimaker 2 will lubricate the axis itself by moving up and down.
Note: Magnalube should be applied to the Z trapezoidal leadscrew only; make sure to not put it on any of the other axes.