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+Kalau di **Windows**, tambah A5 lewat **Printer Properties**, bukan dari dialog Chrome.
+
+## Cara 1 (Paling mudah)
+
+1. Buka:
+
+```text
+Control Panel → Devices and Printers
+```
+
+2. Klik kanan **Epson LQ-310**
+3. Pilih:
+
+```text
+Printing Preferences
+```
+
+4. Cari **Paper/Document Size**
+
+5. Jika ada **A5**, pilih.
+
+---
+
+## Cara 2 — Buat Custom Paper Size
+
+Kalau A5 tidak ada:
+
+### Buka Print Server Properties
+
+1. Tekan:
+
+```text
+Win + R
+```
+
+2. Ketik:
+
+```text
+control printers
+```
+
+3. Di jendela **Devices and Printers**, klik menu atas:
+
+```text
+Print server properties
+```
+
+4. Tab:
+
+```text
+Forms
+```
+
+5. Centang:
+
+```text
+Create a new form
+```
+
+6. Isi:
+
+```text
+Form name: A5 Custom
+Width: 148 mm
+Height: 210 mm
+```
+
+(atau 14.8 cm × 21 cm)
+
+7. Klik **Save Form**
+
+---
+
+## Lalu assign ke printer
+
+Setelah dibuat:
+
+1. Klik kanan **LQ-310**
+2. **Printer Properties**
+3. **Device Settings** atau **Advanced**
+4. Pilih form **A5 Custom**
+
+---
+
+## Kalau Chrome belum muncul A5
+
+Tutup Chrome lalu buka lagi.
+
+Atau klik:
+
+```text
+Print using system dialog (Ctrl+Shift+P)
+```
+
+Biasanya custom form muncul di sana.
+
+---
+
+## Kalau driver Epson LQ-310 menolak custom size
+
+Kadang driver bawaan Epson ngunci ukuran kertas.
+
+Solusinya:
+
+* install ulang driver **Epson ESC/P Standard Driver** (lebih fleksibel)
+* atau pakai **Generic / Text Only** driver untuk form custom.
+
+Kalau LQ-310 Anda dipakai untuk cetak invoice continuous form, itu settingnya agak beda lagi.