This kit is a must have for any Ender series printer. The original springs that came with your printer aren't that strong, which makes the platform uneven very easily, sometimes even during a single print. I used to have an adjustment wheel on the counter under the printer because it worked loose when I was printing. This set of springs will take care of any alignment issues you may have. The wheels themselves aren't bad, but the red ones look and feel a lot better. An all-metal extruder costs money and time to replace. The original plastic with a metal tube through which the thread runs. After 6 weeks of daily PPE printing, despite the filament guide, the filament cut through the tube and started cutting through the plastic feed. This will fix this problem together. You should be aware that the gasket/screw that attaches the tube and body to the extruder is NOT the same size/size as the plastic original. You must use the same size that is attached to your hotend (the other side of the bottom tube). Also get extra features. All in all, this is the first "paid" upgrade you should try on your computer. While you're at it, grab some extra whistles from Capricorn.
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