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KNozz 3D Printer Extruder Nozzle and Part Bed Heater Interface

KNozz is the latest edition to our line-up designed to control the Nozzle Heater and Bed Heater for an Extrusion Type 3D Printer.

KNozz provides two Thermistor Inputs to allow KFLOP to monitor the temperature of both the Extruder Nozzle and Bed Heater Platform.  12-bit ADC converter provides better than 1 degree C temperature repeatability.

Two High Current, Independent, and Optically Isolated FET switches allow controling the Nozzle and Bed Heaters.  Super low on resistance of only 2.1 milli-ohms permits continuous currents of upt to 20 Amps with no heat sinking required.  Channels isolated from each other and may use separate supplies.

Safety Watchdog automatically disables heater outputs whenever temperatures are not being actively monitored.

An additional opto-isolated analog output is provided for general use. 

3 LED status indicators for: Watchdog Enable, Nozzle Heat Powered and Driven, Bed Heat Powered and Driven.

Simple 16-pin ribbon connection to KFLOP JP4 provides logic power and data communication to/from KFLOP.

CNC Application Note:  KNozz may also be used in CNC Applications to provide an isolated analog Spindle Speed Output, two isolated switches for Spindle On/Off/Direction Control, and 2 analog inputs for FRO and SSO potentiometer inputs.

See also: Converting a milling machine to a 3D printer in 3 easy steps.

Please view our on-line documentation for full details.

  • ADC Nozzle Thermistor Input for Temperature Measurement
  • ADC Bed Thermistor Input for Temperature Measurement
  • 20Amp 48V Opto-Iso FET Switch for Nozzle Heater Element
  • 20Amp 48V Opto-Iso FET Switch for Bed Heater Element
  • Heaters Watch Dog
  • Isolated PWM to Analog Converter
  • 3 LED Status Indicators for Watch Dog, Bed, and Nozzle Heaters
  • Thermistor Voltage Reference
  • Direct Connection to KFLOP JP6
  • Screw Terminals
$99 USD Plus Tax, S&H

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KNozz Hardware


Function Parameter Specification
Inputs Number
Resistor Divider
Filter Cap, Tau
2 Analog Inputs
Themistor 100K ohm type
10K ohm 1%
ADC = 10K / (qoK + Rin) * 4096
0.1uF, RC = 1 millisecond
3.3V +/- 1%
Outputs Number
Max Current
Max Voltage
On Resistance
2 FET Outputs (NPN Type)
Full Opto Isolation
20 Amps
2.1 milli ohms
Analog Number
Input Supply Range
Output Impedance Response
1 Fully Isolated Output
<1K ohm
Connectors JP1 Aux Bus to KFLOP
J1 - Bed Heat Element
J2 - Nozzle Heat Element
J3- Analog
J4 - Thermistors/VRef
16 pin Header (IDC 0.1 inch pinch)
4 pin Pluggable Term 5mm Amphenol-FCI TJ04715000J0G
4 pin Pluggable Term 5mm Amphenol-FCI TJ04715000J0G
4 pin Pluggable Term 5mm Phoenix Contact 1934887
4 pin Pluggable Term 5mm Phoenix Contact 1934887
Logic Supplies Voltage VDD5
Max Current
+5V ±10% (supplied by KFLOP)
0.1 Amps
Environment Operating Temperature
Storage Temperature
0-40° C
0-40° C
20-90% Relative Humidity, non-condensing
Lead Free RoHS
Dimensions Length
2.0 inches (50.8mm)
4.5 inches (114mm)
0.75 inches (19mm)

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