Update: 2021-09-24 I have decided to include a free set of ABS plastic spacer/isulators with every set of upgraded springs we sell. I have been hearing reports of shorted hotbed plates due to the springs scraping off the insulating coating on the bottom of hotbed where the heating elements are. We used ABS to withstand high heat from the hotbed and of course for being a tough material.
Every set of spacers are printed on one of our own printers here and we included them for free. If you just want the spacers check https://www.thingiverse.com/thing:4226909 . if you cannot locate them please contact us and we will be happy to pass it on. Great things often disappear from there without warning.
These are NOT the original OEM springs, they are the UPGRADED version. If you are looking for the original springs these are not the ones you're looking for. We still sell the original springs but we do not recommend replacing your old springs with the original version but rather we recommend getting upgraded springs. They are directly compatible and will reduce and mostly eliminate the ned for constant re-leveling. The upgraded springs work on Ender 3 (all) and CR-10 (all.)
Please Note it is normal to have to re-adjust Z-Axis limit switch after install new, more powerful set of springs.