Label Printer Server

A minimal Rust web server that sends text labels to a Munbyn ITPP941 thermal printer over USB.

Features

• Single-page web UI — type text, hit print
• TSPL format for 52mm × 30mm labels
• Direct USB bulk transfer (bypasses kernel driver)
• Cross-compiled ARM64 binary for Raspberry Pi
• Zero dependencies on the remote (single binary + systemd)

Quick Start

Build & Deploy

# Deploy to a remote Pi
./deploy.sh user@<ipv6-address>

# Or set it as an env var
export LABEL_PRINTER_HOST=user@<ipv6-address>
./deploy.sh

Manual Deploy

cross build --release --target aarch64-unknown-linux-gnu
scp target/aarch64-unknown-linux-gnu/release/label-printer-server user@<ipv6>:/home/user/label-printer-server/
ssh user@<ipv6> "sudo systemctl restart label-printer"

Architecture

Browser  ──HTTP──►  Rust Server (axum)  ──USB bulk──►  Munbyn ITPP941
(Yggdrasil)           :8080                   endpoint 0x02

Tech Stack

Component	Choice
Language	Rust (stable)
Web framework	axum 0.8
USB printing	rusb 0.9 (libusb)
Build	cargo + cross
Deploy	systemd service

API

Method	Path	Description
GET	/	Web page with text box + print button
POST	/print	Submit text for printing (text form field)

TSPL Notes

The Munbyn ITPP941 uses TSPL (TSC-compatible), not ZPL. ZPL commands are silently ignored.

Generated TSPL format:

SIZE 52 mm,30 mm
GAP 3 mm,0 mm
CLS
TEXT 7,20,"3",0,1,1,"{user_text}"
PRINT 1

Hardware

Item	Value
Printer	Munbyn ITPP941
Vendor ID	0x09c6
Product ID	0x0248
Resolution	203 DPI
Label size	52mm × 30mm
USB endpoint	0x02 (bulk OUT)
Instruction set	TSPL (TSC-compatible)

Project Structure

label-printer-server/
├── src/
│   ├── main.rs          # Web server, routes, HTML
│   └── print.rs         # ZPL generation + USB bulk transfer
├── systemd/
│   └── label-printer.service
├── udev/
│   └── 99-zebra-printer.rules
├── deploy.sh
├── DESIGN.md
└── Cargo.toml

Future Improvements

• Font size controls
• Label templates
• Print queue
• Printer status detection
• Barcode support
• askama templating