How to replace trapezoid nuts (XL)

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Last updated 4 months ago

Difficulty

Moderate

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Step 1 Introduction

⬢This guide will take you through the installation of the Trapezoid nut on the Original Prusa XL.

The following instructions are compatible with all Original Prusa XL versions.

⬢All necessary parts are available in our eshop prusa3d.com.

Note that you have to be logged in to have access to the spare parts section.

This manual is for both trapezoid nuts on the XL printer. You can choose, which one you want to replace.

Step 2 Tools necessary for this chapter

⬢For this chapter, please prepare:

⬢T10 screwdriver / key

⬢4mm Allen key

Step 3 Unloading filament

⬢If you have loaded the filament, unload it from the hotend. On the screen, navigate to Filament -> Unload Filament.

WARNING: The hotend and heatbed are very HOT. Do not touch these parts!!!

⬢Remove the filament from the hotend. It is necessary to completely remove it from the printer.

⬢Cooldown the printer. Go to Preheat > Cooldown.

Step 4 Printer preparing

⬢Auto home your printer. Go to Control > Auto home.

⬢Move the Z-axis 5 cm under the Nextruder. Go to Control > Move Axis > Move Z.

⬢From the rear side, turn the power switch OFF (symbol "O").

⬢Unlug the power cable.

Step 5 Spool holder removing

Only if you going to replace the trapezoid nut on the left side of the printer.

⬢Turn the printer to the left side facing you.

⬢Using a 4mm Allen key, unscrew the M5x85 screw and remove the spool holder. Place it nearby. We'll use it later.

Step 6 Uninstalling the Wi-Fi antenna

Only if you going to replace the trapezoid nut on the left side of the printer.

⬢Unscrew the antenna and take it out. Place it nearby. We'll use it later.

Only if you have the antenna on the left side of the printer.

Step 7 Detaching the filament sensor

Only if you going to replace the trapezoid nut on the left side of the printer.

⬢Gently push the collet to the rear of the filament sensor assembly.

⬢Gently pull out the PTFE tube.

⬢Detach the filament sensor from the M3nEs nut using a T10 screwdriver.

⬢Disconnect the filament sensor cable from the filament sensor assembly and place it nearby. We'll use it later.

Step 8 Cable cover removing

Only if you going to replace the trapezoid nut on the left side of the printer.

⬢Turn the printer to the back side facing you.

⬢Using a T10 screwdriver, remove two M3x8rT screws.

⬢Remove the cable cover.

⬢Leave the filament sensor cable free.

⬢The printer is now ready to be turned on the left side.

Step 9 Preparing the printer: placing the printer

⬢Turn the printer to the left side.

⬢If you want to replace a Trapezoid nut on the other side, turn the printer to the right side.

The steps are the same for both replacements, go through the manual and replace the left or right trapezoid nut.

Do not move with the printer till you finish the instalation.

Step 10 Uncovering the Z motor cable

⬢Take a look at the bottom of the printer and locate:

⬢Extrusion cover 243mm

⬢Z-motor-cable-bottom-cover

⬢Remove both covers from the printer.

⬢The bottom of the printer is ready.

Step 11 Releasing the Z motor

⬢Using a T10 screwdriver, release and remove two M4x10rT screws. Do not throw them out! We'll use them later.

⬢Using a T10 screwdriver, remove two M3x12rT screws on a Bed-frame. Do not throw them out! We'll use them later.

Move the Bed-frame-mount-fixed (or Bed-frame-mount-rotary) into the middle of the linear rail.

⬢Using a T10 screwdriver, remove four M3x8rT screws to release the Z motor. Do not throw them out! We'll use them later.

Step 12 CAUTION: Lubricant Handling

CAUTION: Avoid direct skin contact with the lubricant used for the linear rails in this printer. If a contact occurs, wash your hands immediately. Especially before eating, drinking, or touching your face.

⬢Lubricant accumulates mainly in the linear rail channels on the linear sides.

Step 13 Pulling out the Z motor

⬢Grasp the Z motor with your hand. Don't pull out yet!

⬢Grasp the threaded rod with your second hand.

⬢Gently pull out the motor from the Bed frame.

⬢Place the threaded rod on a Bed-frame-mount-fixed.

Step 14 Uinstalling the old trapezoid nut

⬢Manually unscrew counterclockwise the old trapezoid nut.

Throw the old trapezoid nut in the trash to avoid confusion.

Step 15 Installing the Trapezoid nut: parts preparation

⬢For the following steps, please prepare:

⬢New trapezoid nut (1x)

Step 16 Installing the Trapezoid nut: installing the nut

⬢Attach the new trapezoidal nut onto the Z-axis threaded rod, only a few centimeters in.

Double-check the correct orientation of the nut! See the picture carefully.

⬢Screw the trapezoid nut at least 6 cm from the top of the Z-motor.

Step 17 Installing the Trapezoid nut: Z motor attaching

Keep the trapezoid rod in the middle of the hole for the motor to avoid the damage.

⬢With one hand, take the Z motor so that the threaded rod is horizontally in the motor hole.

⬢Using the second hand, insert gently the Z motor back through the Bed-frame.

⬢Move the Z motor to the left side through the Bed-frame.

Step 18 Securing Z motor: parts preparation

⬢For the following steps, please prepare:

⬢M4x12rT screws (2x)

⬢M4x10rT screws (2x)

⬢M3x10rT screws (4x)

Step 19 Securing the Z motor

⬢Insert four M3x10rT screws into the four holes in Z-motor-mount.

⬢Tighten the screws with a T10 screwdriver.

Step 20 Securing the Trapezoid nut

Do not move with the Bed-frame! Move only the trapezoid nut.

⬢From the bottom side of the heatbed:

⬢Line up the threaded rod in the trapezoid nut with the threated hole in the Bed-frame by turning it clockwise.

⬢From the upper side of the heatbed:

⬢Locate two holes next to the threaded rod.

Be really careful, you can easily turn the screw and damage the thread in the trapezoid nut.

⬢Insert two M4x10rT screws and gently tighten them using a T10 screwdriver.

Step 21 Securing Bed-frame-mount-fixed

⬢Manually slide the Bed-frame-mount-rotary to the Bed-frame.

⬢Secure the Bed-frame-mount-fixed (or Bed-frame-mount-rotary) to the Bed-frame with two M3x12rT screws using a T10 screwdriver.

Step 22 Covering Z motor

⬢Take a look at the bottom of the printer.

Be careful, don't pinch any cables!

⬢Insert the motor cable in the extrusion. Make sure it goes perpendicular from the motor to the extrusion first.

⬢Insert the Extrusion cover 243mm. Push and slide it to the right.

⬢Push the Z-motor-cable-bottom-cover into the frame.

Step 23 Turning the printer

⬢Turn the printer to the right side on it's feet.

⬢If you replaced the Trapezoid nut on the other side, turn the printer to the left side on it's feet.

Step 24 Cable cover attaching: parts preparation

⬢For the following steps, please prepare:

⬢Cable cover (1x)

⬢M3x10rT (2x)

Step 25 Cable cover attaching

⬢Turn the printer to the back side facing you.

Be careful, don't pinch any cables!

⬢Put the cable cover back in its position.

⬢Insert two M3x8rT screws and tighten them using a T10 screwdriver.

Step 26 Preparing the Filament sensor

⬢For the following steps, please prepare:

⬢M3x12rT screw (1x)

⬢Filament sensor assembly

Step 27 Attaching the filament sensor

⬢Connect the filament sensor cable to the filament sensor assembly.

⬢Move the filament sensor assembly to the top of the extrusion and align the M3nEs nut so that it aligns with the opening on the filament sensor assembly.

⬢Attach the filament sensor to the M3nEs nut using the M3x12rT screw and T10 screwdriver.

⬢Insert the PTFE tube from the extruder into to the first collet on the rear of the filament sensor assembly.

Step 28 Installing the Wi-Fi antenna: parts preparation

⬢For the following steps, please prepare:

⬢Wi-Fi antenna (1x)

The Original Prusa XL is shipped with two versions of the Wi-Fi antenna, each with a different shape. The functionality is the same.

Step 29 Installing the Wi-Fi antenna

Only if you have the antenna on the left side of the printer.

⬢Locate the Wi-Fi antenna connector on the right rear corner of the printer.

⬢The antenna can be rotated around and bent in two directions.

⬢We recommend pointing the antenna straight upwards.

Step 30 Assembling the spool holder: parts preparation

⬢For the following steps, please prepare:

⬢Spool-holder-slider (1x)

⬢Spool-holder-base (1x)

⬢Spool-holder-mount (1x)

⬢M5x85 screw (1x)

Step 31 Assembling the spool holder

⬢Insert the spool-holder-base into the spool-holder-slider. The narrower part of the base should go in first. Push it all the way in.

⬢Attach the spool-holder to the spool-holder-mount.

⬢Insert the M5x85 screw into the spool holder assembly.

Step 32 Mounting the spool holder assembly

⬢Turn the printer to the left side facing you.

⬢Attach the spool holder assembly to the M5nEs nut on the printer. Note that there is a protrusion on the spool-holder-mount, which fits into the groove in the extrusion.