A print head can be quickly worn out or damaged – a damper clogged or a pump stuck. A fast repair or a quick replacement is only possible if you have the appropriate spare parts in stock or if you’ll get them until the next day. Spare parts with a certified quality, so that you don’t have the same problem again after the replacement. Cheap parts are not necessarily tested and down time makes these an expensive option.
I recommend only tested original parts and original accessories sourced from various manufacturers that are really best suited for your production.