RFC-003: Hardware Support Implementation

Overview

Technical implementation for multi-printer support with automatic canvas sizing.

Feature Requirements

Feature: Support for changing printers. Supported printers include: Canon Selphy CP1500, general POS thermal printers (Epson, Panda), and Instax Mini Link.

Details:

• Ability to seamlessly switch the target printer.
• Adjust the print output size natively according to the selected printer's specifications.

Supported Printers

Printer	Connection	Paper Size	DPI
Canon Selphy CP1500	USB/Bluetooth	4x6, 5x7	300
Epson TM-T88	USB/Bluetooth	58mm, 80mm	203
Niimbot B21	Bluetooth	58mm, 80mm	203
Instax Mini Link	Bluetooth	62x46mm	318

Printer Interface

interface Printer {
  id: string;
  name: string;
  type: PrinterType;
  paperSize: PaperSize;
  dpi: number;
  connect(): Promise<void>;
  disconnect(): Promise<void>;
  print(imageData: Blob): Promise<PrintResult>;
}

Canvas Configuration

API Endpoints

Method	Endpoint	Description
GET	/api/printers	List supported printers
POST	/api/printers/connect	Connect to printer
POST	/api/printers/test	Print test page
GET	/api/printers/status	Get printer status

Implementation Phases

1. Phase 1: Printer abstraction + config loading
2. Phase 2: Dynamic canvas sizing
3. Phase 3: Test print functionality
4. Phase 4: Instax Mini Link specific implementation

Related Files

• ADR: ADR-005-hardware-support.md