The most frequently asked question is generally that relating to routine maintenance of 3D printers.
Maintenance is generally minimal: cleaning of extruded plastic, cleaning the filament ducts, make sure by visually checking the operation of the fans.

Occasionally, and also as a function of printing hours, the state of tension of the belts should be checked, this check is urgent if you find any slippage on the axles.

Even more rarely is the lubrication of the guides, thanks to the high quality of the same, it should only be done in sporadic cases.
In case it is necessary, you will only have to use products such as silicone oil with the addition of Teflon.