how to make a Structure like an end city/mineshafts

I think you would have to use jigsaw blocks instead of structure blocks, but those aren’t supported in MCreator yet.

They are blocks in vanilla minecraft that can be obtained by using the command: /give @s minecraft:jigsaw

and they have something to do with structures.

Other then that,  ¯\_(ツ)_/¯

This might help: https://minecraft.gamepedia.com/Jigsaw_Block

i had the exact same question. i was going to make a post about that but... you did it for me.

you did good when it came to spelling. it was all understandable.

oh and i like your pfp (profile picture). reminds me of a certain boss from Terraria.

keep up the good work man!

The best way to do that is to make a custom block that when spawns in the world, gets replaced by your structure. I mean, you should make your structure components and then use some blocks to (when triggering at world gen) place your components correctly. Is essentially the same system as Jigsaw blocks, but made by yourself. This works for me, also you should make a gamerule that disables the switch that your block does when spawning, as you need to place the blocks and save the structures, and if the block is placed, it spawns the structure, so toggle on and off your block system using a gamerule or so (in your build world, i mean)

If I use custom blocks instead of jigsaw blocks, how do I make sure the rotation for the structure matches the rotation of the block?