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iHeater FAQ

Is iHeater compatible with my printer?

iHeater is compatible with any printer running the current version of Klipper, and it can also work standalone with the standalone firmware.

What heater power is used?

  • The default heater is 200 W.
  • Other options: 100 W, 70 W, and 50 W - mainly for SLS printers with small chambers where high temperatures are unnecessary.

Which controller is used in iHeater?

It uses STM32F042 (current version).

Which material should I use to print the enclosure?

It is recommended to use ABS/ASA or higher temperature-resistant materials.

Will the enclosure melt at 130 °C?

  • The configured temperature is measured by the thermistor near the heater.
  • At the aluminum tube edges, the temperature is lower due to airflow.
  • Spacer screws are included to reduce heat load.

⚠️ On first startup, check operating limits:

  • Raise the temperature stepwise (5-10°C per step).
  • Probe the enclosure with a rigid tool.
  • If plastic softens - reduce the set temperature.

What typical issues may occur?

If the heater goes into uncontrolled heating, check the thermistor installation. As with iDryer, an incorrectly installed thermistor results in overheating and enclosure damage.

How is safety handled?

The safety system has multiple layers:

  • Software control: automatic shutdown on overheating.
  • Watchdog timer: MCU watchdog prevents hangs.
  • Hardware protection: thermal fuse used. For testing - KSD-9700 (auto-resets). For permanent use - RH-135 (trips at 135 °C, permanently opens).
  • A fuse is also present on the controller board for short-circuit protection.

What is the small blue board in the kit?

It is a 220 V power supply - test option. iHeater board supports its use. ⚠️ Only install if you are qualified and understand the risks. If you connect this board, never power via USB. It is intended only for standalone mode.

What power supply is required?

iHeater consumes about 100 mA. No special requirements.

Can I power iHeater from the printer's internal power (110/220 V)?

Yes. You can connect iHeater so that both printer and iHeater share the same switch. Additionally, iHeater includes a special adapter that replaces C7/C8 connectors, allowing direct connection to screw terminals on the board.

Where can I find documentation?

Documentation is available here: