Name of the mod: Schematica
Url about it:
https://mods.io/mods/1008-schematica since it requieres LunatriusCore to run,
here the link for that:
https://mods.io/mods/1025-lunatriuscoreWhy do you think it should be allowed:
The mod allows you to display a hologram, loaded from a schematic file, for easier rebuilding. You can also save your creations to schematic files
and share them.
its super handy for the recreation of Singleplayer builds on a server since one gets 1:1 3D copy of clients side ghostblocks. It has a 'printer'
function which theoretically would take the the available blocks out of a Player current Inventory to build the schematic, on servers its a bit buggy
so not usable. It can also display the exact amount of materials needed for a build.