Snapmaker Vinyl Cutter Attachment

Thanks for response!
I saw the spring description on the link but where to put the spring? Do you have a picture to understand better where and how the spring works on the project?

Sorry for the stupid question but I printed the holder and I received the blade and it’s not clear to me how to assembly because: should I unscrew the blade until it length stick solid inside the printed holder? The spring has 7mm hole and can’t push the little pin on the upside of the blade…

The spring goes inside the printed mount at the very top. The blade holder has a push button at the top which releases the blade. Put the spring on that button and put the blade holder into the mount. It pushes the blade down to account for the uneven sticker surface.