Hardware bill of materials¶

The hardware actually deployed in the reference fleet — the printers this stack is developed and tested against. Not a buying guide, and not a requirement list: every controller below can be substituted with a Raspberry Pi, a BTT Pi-equivalent, or any other Klipper-capable host. The stack itself doesn't depend on any specific controller family.

Voron 2.4 (StealthChanger)¶

Component	Make / Model	Notes
Printer frame	Voron 2.4	Standard Voron BOM applies — see vorondesign.com
Host	Recore A7	Linux SBC with onboard stepper drivers; see iAgent wiki
Toolchanger plates / docks	StealthChanger	Open-source design — see CalKraken/StealthChanger
Toolheads	5 × StealthChanger toolheads	Each carries its own hotend, extruder, fans
Toolboards	5 × RP2040-based	Same firmware build across all 5 (avoids hub enumeration drift — see Flashing guide)
USB hub	VIA Labs	Has the enumeration quirk noted in the flashing how-to
NFC reader	PN532 on USB-UART	Shared across all 5 tools — operator scans spools at a single station

Voron Trident 300¶

Component	Make / Model	Notes
Printer frame	Voron Trident 300	Standard Voron BOM
Host	Recore A8	Linux SBC with onboard stepper drivers; see iAgent wiki
NFC reader	PN532 on USB-UART	Single-tool, single reader

Voron V0¶

Component	Make / Model	Notes
Printer frame	Voron V0	Standard Voron BOM
Host	Recore A6	Linux SBC with onboard stepper drivers; see iAgent wiki
NFC reader	PN532 on USB-UART	External reader (limited internal volume on V0)

CR-30 (Klipper modded)¶

Component	Make / Model	Notes
Base printer	Creality CR-30 ("PrintMill")	Belt printer, converted to Klipper
Host (reference)	Recore A8	Same board as the Trident; any Klipper-capable controller (RPi, BTT-equivalent) substitutes cleanly
NFC reader	PN532 on USB-UART	Single reader

Elyarchi Alcheman¶

Component	Make / Model	Notes
Printer	Elyarchi Alcheman	Proprietary chassis + controller
Host	Vendor controller, ships with Klipper + Fluidd preinstalled	No host swap needed; the NFC daemon installs alongside the vendor's existing config
NFC reader	PN532 on USB-UART	Single reader

Snapmaker J1S¶

Component	Make / Model	Notes
Printer	Snapmaker J1S	Stock, unmodified firmware
Host SBC	Raspberry Pi 3	921 MB RAM — Pi 4 also works
SD card	≥ 8 GB Class 10	Image build is ~3 GB
NFC reader	PN532 on USB-UART	Pre-installed on the J1S Pi image

Shared infrastructure¶

Component	Notes
Spoolman host	Docker / Linux box on the LAN; runs the goeland86/Spoolman NFC fork on `:7912`
Postgres	Backing DB for Spoolman (SQLite works for single-printer setups)

NFC readers — sourcing notes¶

PN532 modules are the cheapest reliable option. Recommendations:

Avoid Aliexpress no-name PN532s that ship pre-set to I2C with the SEL0/SEL1 traces cut wrong. Buy from a vendor that lets you select UART mode in stock.
USB-UART bridges: CH340 and FTDI both work. PL2303 also works, some older Linux kernels have quirky behavior — prefer CH340/FTDI if you have a choice.
HSU wakeup: Once the daemon was upgraded to emit the 16-byte 0x55 preamble before every command, no ESP32-based bridge MCU is needed. Direct PN532-to-USB-UART works fine.

NFC tags — sourcing notes¶

TigerTag: bought with spools that carry them pre-printed (some vendors). Standalone NTAG213 stickers can be written by the manufacturer but typically you receive them pre-encoded.
OpenPrintTag: NFC-V (ICODE SLIX2) stickers from a generic NFC supplier. Format is community-defined, so you write your own.

Wiring summaries¶

PN532 to USB-UART¶

PN532  ── UART  ──  USB-UART bridge  ──  USB  ──  Pi / Recore
TX                  RX
RX                  TX
GND                 GND
VCC (3.3V / 5V)     3.3V (most boards) or 5V (check breakout's regulator)

DIP switches on the PN532: set to UART (typically 00). Some boards have solder jumpers instead — same idea.

PN5180 (SPI)¶

Wiring varies per controller (Pi GPIO header, Klipper MCU SPI, etc.) and per PN5180 breakout. Refer to your controller's documentation and your PN5180 reader's documentation for the correct pin assignments, then plug those GPIO numbers into pn5180_busy_pin and pn5180_reset_pin in nfc_spoolman.cfg.

ACR1552U¶

USB cable. That's it.