SchemConvert vs Seija-Printer

SchemConvert is a free, open-source desktop tool for converting Minecraft schematic files between four formats: .nbt, .schem, .litematic, and .bp. The formats correspond to different Minecraft tools and workflows: .nbt is used by vanilla structure blocks, .schem by community programs such as WorldEdit and MCEdit, .litematic by Litematica, and .bp by Axiom for blueprints. It can process multiple schematics in one batch, and command-line conversion to .litematic is supported. The listed placement workflow is export-only, so the tool’s role is converting and exporting files rather than placing them. SchemConvert runs on Linux, macOS, and Windows desktop systems and requires Java 21 or later. The repository is published under the GPL-3.0 license. GitHub reports no published security advisories and no SECURITY.md file. The project is hosted on GitHub, where its owner describes occasional coding and contributions to ParchmentMC mappings.

Seija-Printer is a free, open-source Minecraft mod for printing blocks and fluids from Litematica schematics while you play. It simulates placement on the client and compares selected block-state properties with the schematic before placing the intended state. Meteor Client and Litematica are required. Configuration can allow midair placement and states that differ from the player’s facing direction on servers without anti-cheat plugins. Face-detection and ray-tracing checks are available for servers with anti-cheat. Block replacement substitutes custom blocks for schematic blocks, Bridge mode attempts to add supports around suspended blocks, and Surface mode prints a chosen number of outer schematic layers. Fluid placement is unstable and may put fluids in wrong locations, so the README recommends enabling it after construction. Simulation is performance intensive, and a large placement range may crash the game. The maintainer describes the project as close to semi-discontinued but plans to adapt it to newer Minecraft versions.