# Automatic Pellet Feeding System

# What's in the box

Item Quantity
Pellet Feeding System Controller 1
Air venturi for ¾” hose 1
¾” hose 3.8m
6mm Nylon hose 2m
Worm clamp 3
Elbow PTC 3

# What you need

  • 24VDC Power Supply with a minimum of 2A
  • An open-source compatible 3D Printer Controller (Optional. Enable the printer to pause when you are out of pellets).
    • Marlin
    • Repetier
    • RepRap
  • Compressed air supply
    • An air compressor with a recommended airflow of 50 SCFM or 85 m3/hr
    • Air filter 10 microns
    • Oil removal Filter
    • Pressure regulator
    • Venturi inlet vacuum hose of 72”H2O or 18 kPa


Our pellet feeding system comes with a corrugated hose designed to withstand vacuum. Should you use another hose, make sure it is rated for vacuum operation.

# Wiring

  • The controller unit works on 24VDC
  • The valve on the controller unit uses a 6mm push-in fitting.
  • We recommend using ferrule crimps for the wires of the sensors, power and the output. Ferrule crimps are recommended
  • Connect the capacitive sensor (packed with your Pulsar™) in the Sensor input.

# Venturi Installation

Follow the instructions below for a safe installation of the air venturi vacuum.

  • Position the venturi vacuum between hoses connecting the hopper/pellets container to the Pulsar Extruder
  • Install ¼” NPT to 6 mm push-in fitting on the venturi vacuum
  • Connect the 6 mm hose between the controller and vacuum
  • Connect the capacitive sensor to the controller
  • Connect the power to the controller
  • Fill the Pulsar™ inlet with material
  • Calibrate the sensor’s sensitivity (see calibration procedure)
  • Connect the hoses to the Pulsar™
  • Connect Air supply to the controller

# Good practices

Good practices

  • Venturi Material Exhaust oriented upward
  • Avoid sharp turns in the hose
  • Material inlet hose oriented upward
  • Material hopper/container converges into a funnel
  • The hose transporting the pellets must have a limited section below the inlet of the bulk material
  • Adjust the open time of the controller according to the length of the hose between the venturi and the pellet extruder.


Avoid any of the details mentionned below!

Bad practices

# Sensor Calibration Procedure

Tools Needed :

  • Small flat screwdriver
  1. Fill the Pulsar™ inlet with pellets
  2. Turn on the pellet feeding controller to power up the sensor
  3. Turn the screw on the sensor counterclockwise until the red LED turns off
  4. Turn the screw a quarter turn clockwise at a time until the red LED turns on

# Pellet Feeding Controller Logic & Configuration

  1. To configure the pellet feeding controller, download & install the venturi configuration tool: VenturyInterface_v1_0_beta_1_copy (opens new window)

  2. Plug a USB mini type B to the controller from your computer and launch the software. You can then configure the operating variables.

Plug a USB mini type B to the controller

Configuration inputs

Controller Logic

# Firmware

This section will show you how to enable a pause feature when the venturi controller detects that you are out of pellets and the alarm is raised.

# Marlin Firmware

You can use the filament runout feature.

See our doc: https://docs.dyzedesign.com/filament-sentinel.html#marlin-firmware

# Repetier Firmware

See our doc for filament runout feature: https://docs.dyzedesign.com/filament-sentinel.html#repetier-firmware

# Reprap firmware


Last Updated: 8/3/2021, 5:21:22 PM