ESD gloves are anti-static (prevent damage to the electronics).

⬢Turn the left side of the printer towards you.

⬢Locate, release and remove four screws.

⬢Turn the printer to the other side (180 °) and again release four screws.

⬢Slide the cover just a few cm/inches out.

⬢There are two versions of the optical sensor mount. Look closer to see which version you have and follow the appropriate steps:

⬢Open the lid all the way up.

⬢Look from below and locate the screw on the right side of the touchscreen frame. Release the screw.

⬢Slightly loosen the screw on the left side of the frame. Do not remove it.

⬢Carefully rotate the touchscreen all the way to the left.

If you can't rotate the screen easily, loosen the left screw a little more.

⬢Disconnect the optical sensor cable.

⬢Release two M3x5 screws on the optical sensor gate.

⬢Remove the optical sensor gate with optical sensor from the tilt motor assembly.

⬢For the following steps, it is necessary to move (rotate) the connecting rod up. Make sure that the top surface of the tilt with the display is flush with the frame of the printer.

⬢Place the new optical sensor on the tilt motor holder.

⬢Secure the optical sensor by two M3x5 screws. For now, tighten the screws just slightly. We need to align the sensor first.

⬢Connect the cable to the sensor, ensure you aren't using the side with the yellow marker. While inserting the connector on the pins of the sensor, the connector has to be slightly inclined. See the picture.

⬢Carefully rotate the touchscreen back to its original position.

⬢Insert the M4x10 screw back into the hole on the right side of the touchscreen frame and tighten the screw.

⬢Tighten the screw on the left side of the frame.

⬢Now skip to Assembling the cover

⬢Open the lid all the way up.

⬢Look from below and locate the screw on the right side of the touchscreen frame. Release the screw.

⬢Slightly loosen the screw on the left side of the frame. Do not remove it.

⬢Carefully rotate the touchscreen all the way to the left.

If you can't rotate the screen easily, loosen the left screw a little more.

⬢Cut the zip tie securing the USB, Power, optical, and touchscreen cables.

⬢Disconnect the optical sensor cable.

⬢Release two M3x5 screws on the optical sensor gate.

⬢Remove the optical sensor gate with optical sensor from the tilt motor assembly.

⬢Disconnect the optical sensor cable (labelled "O") from the electronics.

Some older units may be without the yellow cable marking.

⬢Cut the zip tie on the cables from the USB & Power, optical sensor and touchscreen.

⬢Loosen the grub screw in the connecting rod. Do not remove the screw!

⬢Release both screws on the tilt motor holder.

⬢Slightly tilt the connecting rod out of the printer.

⬢Pull out the tilt motor from the connecting rod.

⬢Place the tilt motor in front of the printer, make sure that the motor cable isn't stretched.

⬢Release four screws from the tilt motor holder.

⬢Remove the tilt motor holder from the tilt motor.

⬢Using the 5.5mm wrench and 2.0mm Allen key release the fitted screw with the connecting rod from the tilt assembly.

⬢Remove the connecting rod from the printer.

⬢New connecting rod (1x)

⬢New optical IR-sensor (1x)

The list continues in the next step...

⬢New tilt motor holder (1x)

⬢M3x5 screw (2x)

⬢Zip tie (1x)

⬢Slide the fitted screw through the tilt holder.

⬢Place the M3w washer on the screw together with the M3nN nyloc nut and carefully tighten the nut to ensure direct contact between both parts. It is recommended to use the 5.5mm wrench to hold the nut and an Allen key from the other side.

⬢

⬢Place the optical sensor on the holder and secure it using two M3x5 screws. Don't tighten the screws, we need to adjust the position of the sensor.

⬢Rotate the flat part of the shaft against the grub screw in the connecting rod as you see in the picture.

⬢Slide the tilt motor shaft in the connecting rod.

⬢Place the tilt motor assembly into the groove in the bottom plate. And make sure the tilt motor holder is aligned with the groove.

⬢Secure the tilt motor holder with two M4x8 screws.

⬢IMPORTANT: Align the connecting rod with the protrusion on the holder. Both surfaces should be flush. This will ensure the rod will be vertical.

⬢Tighten the grub screw in the connecting rod.

⬢Connect the cable to the sensor, ensure you aren't using the side with the yellow marker. In the beginning, while connecting the cable the connector has to be slightly inclined.

⬢Push the connecting rod down, so that the notch on the rod reaches the optical sensor.

⬢Connect the new optical sensor cable (labelled "O") to the first connector from the right on the Motion Controller.

⬢Carefully rotate the touchscreen back to its original position.

⬢Insert the M4x10 screw back into the hole on the right side of the touchscreen frame and tighten the screw.

⬢Tighten the screw on the left side of the frame.

⬢Tie together the USB, Power, optical, and touchscreen cables. (old version only)

⬢Slide the cover half-way to the printer and stop, we need to connect the front USB and power button first.

⬢NEW DESIGN: Look from above in the front cover and connect the USB & Power cable. Make sure the safety pin "clicks".

⬢OLD DESIGN: Connect the power cable button to the extension cable. Make sure the safety pin "clicks".

⬢Slide the cover on the printer and secure it on one side using two M3x5b countersunk screws. Don't tighten them firmly and move on the other side, repeat the procedure.

⬢As soon as the cover is aligned and partly secured, add the remaining screws and tighten them all.

⬢Turn the printer over (180 °) and use the same procedure.

⬢Now, please read the 3D Printing Handbook and follow the instructions to calibrate the printer. The latest version is always available at prusa3d.com/3dhandbookSL1

⬢Great job! Your optical sensor is replaced.