Screenshots (not as good as seeing the animation on the video)
The anvil comes from the wall being pushed sideways, and damages itself on the fall.
Can store around 251 anvils.
No pistons exposed.
If your ceiling 3 blocks tall, you will probably need to cover up a single hole on the wall with a stair or trapdoor, as shown in the first screenshots, but it's optional, and other than that, it should be completely flush with the wall and not take ceiling space. If 4 or more blocks tall, though, you might have to cover more of the wall up.
The whole contraption takes [6W x 5L x 7H] blocks of space.
An attractive work-around to being unable to place a replacement anvil via dispenser… (For an upgrade, make the replacement automatic wjen the old anvil breaks [My assumption is that thiswould need to be done indirectly by counting block state chages from the time the anvil was placed.] )
Not something I see as a particularly practical build, but then also not likely the point …
Nice work on the piston timimgs :>:
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WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.
For a second I thought nobody would notice my thread, thanks a lot for giving me feedback, I'm happy someone liked it!
Also, I didn't even think about making it fully auto, I'm working on it right now. I've finished making the redstone counter part that should luckly be enough to activate the mechanism whenever an anvil breaks.
edit: nice catch on telling me that I was going to have to count the block state changes, I probably wouldn't have tought of it
I should at least post screenshots of the full final and automatic mechanism here, and if someone still has interest on it, I might make another video about it. (if I post nothing after this, it went wrong AND I forgot to update this)
IMPORTANT: Put all DIRT inside the dropper BEFORE placing an undamaged anvil on top of the observer OR put 3 dirt inside the dropper and 1 inside the locked hopper AFTER placing an undamaged anvil on top of the observer.
The new size becomes [6W x 6L x 10H].
I'll eventually record the whole video again for the new version, and keep both, since the other one is still has the two advantages of being more compact and having no exposed observer.