In complex machines with many moving parts, it is common knowledge that high-quality parts still experience wear and tear, especially after extended or heavy use. Maintenance is a necessary requirement of nearly every machine. We have assembled into one convenient bag some parts which, during extended use of your Ender 3 printer, might wear down, or require replacement. We have listened closely to our community and these are the parts that most consumers find they need replacement parts for, after the original parts wear down. We like to call this, the “Headache Prevention Kit”.