3D45 Extruder

  • Unclogging Extruder
  • Replace Runout Sensor
  • Nozzle Gap Calibration

Unclogging the Extruder

This video will walk you through the steps to properly clear out a clogged extruder.  Since the reason the extruder may be clogged is not yet clear, the video will provide a several options to help you clear out the clog.  

Step by Step instructions are also listed out below for all 4 options.

Replacing Runout Sensor on the 3D45

If your printer isn't able to detect when the filament has runout, you may need to replace the filament run-out sensor on your printer. To do this, the top cover of the extruder will need to be replaced. To do this follow these steps.


Tools Required:

1. T10 Torx Bit or Screwdriver

Replacing the Top Cover of the Extruder

a. Cut the filament just before the intake on the top of the extruder.

b. Remove screw located on the right side of the hole using the T10 Torx screwdriver. The first picture below shows the location of the screw, the second picture a bottom view of the area where the screw is located, circled in red is the screw that needs to be removed.

c. Unscrew the two screws on the top of the filament guide bracket using the 2.5mm bit or Hex wrench.

d. Remove the top cover.

e. Carefully unplug filament run out switch from the extruder circuit board, ensuring to pull from the plastic plug and not the wires; pulling the wires can damage the connection to the extruder. Please see picture below.

f. Re-attach the fillament run out switch connector from previous step. Fasten the two screws on the top of the extruder top cover using the 2.5 mm hex wrench. Fasten right screw on the bottom of the extrder removed in step b using the T10 Torx screwdriver. Inset filament into extruder, and resume normal printer usage.

Nozzle Gap Calibration

This video will walk you through the steps to modify your gap offsets and therefore achieve better print results. 

Having the correct nozzle gap is vital to achieving successful prints. The nozzle gap, also referred to as Z-Gap, is the distance of the nozzle to the build platform when the first layer is being printed. It is important to ensure that the first layer sticks well to the build platform, therefore, the nozzle gap needs to be ideal. Too large of a nozzle gap may lead to a not well adhered first layer, leading to object shifting, and a too small nozzle gap may lead to a non-visible first layer, possibly leading to clogging issues.

Step 1: Go to Calibrate Screen

From printer home screen, navigate to tools, calibrate, and then assisted nozzle calibration. Advanced users can use the nozzle gap calibration directly (non-assisted mode).

Step 2: Open Assisted Nozzle Calibration Screen

a. Apply glue on the build platform.See glue application bulletin.

b. Ensure leveling switch is free of glue residue and that the filament has been loaded.

c. Level the build platform if needed.

Step 3: Assisted Nozzle Calibration

a. Nozzle will start heating up in order to perform the calibration.

b. In this process, three small rectangles will be printed side by side. Rectangle A will be printed with an offset of +0.1mm from the current setting, Rectangle B will be printed with no offset, and Rectangle C will be printed with a -0.1mm offset. An additional rectangle will be printed enclosing Rectangles A, B, and C in order to prime the nozzle and make sure filament is flowing correctly before starting the print.

Step 4: Nozzle Gap Calibration Analysis

a. Once the print has been completed, there will be three different rectangles representing three different Nozzle Gap offsets.


b. Look at rectangles A, B, and C to determine which offset has the best layer adhesion. Follow the instructions below for each scenario.

Note: If you see little or no filament: If the nozzle is too close to the build platform, the first layer will print too tight to the build plate. Increase the Nozzle Gap +0.1mm. Repeat the Assisted Nozzle Calibration Process until an optimum nozzle gap has been achieved.

If the first layer is not adhering or gaps between the lines: If the nozzle is too far from the build plate, the first layer will not adhere well. Decrease the Nozzle Gap -0.1mm. Repeat the Assisted Nozzle Calibration Process until an optimum nozzle gap has been achieved.

Ideal nozzle gap distance: First layer will be adhering and be visible. Lines should not look like they were pressed against the build platform.