# A3 DTF: short waste bottle plus F-INK/ONE one-way valve on white

- Source-Date (SAST): 2025-01-25 14:11; blow-test 2025-01-25 14:21
- Dest: both
- Review-after: 2027-08-31
- Status: current

## Facts

- White-ink dampers mixing with other colours on A3 DTF: the water / waste tank is too tall (a 500 ml cool-drink bottle is too tall). Use a **300 ml** cool-drink bottle or a short takeaway sauce bottle.
- Add an **F-INK/ONE** one-way valve on the white-damper waste line to stop waste-ink backflow. Product: https://buythis.co.za/f-ink-one
- Blow the valve before fitting. Air passes one way only — that is the install direction. If it blows both ways or neither way, the valve is broken.
- One valve per A3 DTF printer.