@thatguyoverthere I'm surprised you can replace blades in these at all. TBH, living most of my life in the city, I didn't know woodchippers even existed until I went to the country hiding from COVID, I mean the compact ones you can own yourself, not large scale industrial ones. The one I've operated was still bigger than the one in the photo and the blades in it were just giant cogwheels — didn't look replaceable and I had a lot of trouble even cleaning them properly.
The blades are bolted onto the plate. I'd be surprised if you couldn't take them off and sharpen them or replace them. I mean they are a pain in the ass to remove (the bolts are locktited in) but it only took a little while. I ran into stupid problems like not having any extra bolts around and all of my drill batteries being dead, but the actual work to replace them is only 10 bolts.