We’re adding new add-ons for U1 on Kickstarter:
Hardened Steel Hot End Bundle (0.2 / 0.4 / 0.6 / 0.8 mm)
PEI Steel Plate (Smooth Surface)
Steel Build Plate (Carbon-Fiber Texture Surface)
Check the details on U1 Kickstarter page→
I’m consufed, what’s the difference between PEI Steel Plate (Smooth Surface) and PEI Steel Sheet?
Why is one called ‘Plate’ and the other ‘Sheet’? 
Not sure why the change in language. But the difference between the included one and the “smooth surface” plate is only the texture.
The smooth PEI sheet provides a very nice matte finish to the bottom of prints. Though I would note, adhesion may differ depending on material. And to be careful not to scratch smooth or carbon-fiber textured sheets, as any scratches on those will be more obvious if transferred to a print (versus a normal, coarse sheet).
Thank you for your feedback and for pointing this out. We will update the wording when the pre-order goes live on our store and unify it as PEI Steel Plate.
延保适用用中国用户吗？
中国用户也是可以的哈~ 
How to Manage Add-ons for Your Pledge
Hi everyone, If you want to update your add-ons for your U1 pledge, here are some helpful guides:
Important note: We will send you a backer survey before shipping to confirm your delivery address. During that process, you can still add any desired add-ons to your order. The price of any add-ons purchased through the survey will be the same as the current add-on prices (except for the Snapmaker Care 1-Year Plan for U1).
