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  1. Ensure the printer is turned off and not plugged in. While moving with the extruder, the X-axis motor works as a generator. You will create a small amount of electricity and the LCD might flicker. Move with the extruder reasonably slowly and in the future always use the printer's controls. Move the extruder manually all the way to the left.
    • Ensure the printer is turned off and not plugged in.

    • While moving with the extruder, the X-axis motor works as a generator. You will create a small amount of electricity and the LCD might flicker. Move with the extruder reasonably slowly and in the future always use the printer's controls.

    • Move the extruder manually all the way to the left.

    • By rotating BOTH threaded rods at the same time on the Z-axis move the nozzle until you reach the heatbed. Try rotating both the rods equally!

    • Check again from a different angle the nozzle is touching slightly the heatbed. Don't bend the heatbed!

    • Don't place the steel sheet on the heatbed during the entire P.I.N.D.A. probe adjustment process. Wait for the XYZ calibration.

  2. Move the extruder carefully all the way to the right. Make sure that the nozzle is not scratching the surface during the movement! If it does, rise the right side of the X-axis by rotating the right Z motor slightly clockwise.
    • Move the extruder carefully all the way to the right.

    • Make sure that the nozzle is not scratching the surface during the movement! If it does, rise the right side of the X-axis by rotating the right Z motor slightly clockwise.

    • If an adjustment is needed, you can lower the nozzle height by rotating the right Z motor counter-clockwise.

  3. Move the extruder to the centre of the X-axis. Take a zip tie from the package and place it under the P.I.N.D.A. sensor. Use the middle part of the zip tie, not the tip. Release the screw holding the P.I.N.D.A. sensor and gently press it against the zip tie.
    • Move the extruder to the centre of the X-axis.

    • Take a zip tie from the package and place it under the P.I.N.D.A. sensor. Use the middle part of the zip tie, not the tip.

    • Release the screw holding the P.I.N.D.A. sensor and gently press it against the zip tie.

    • Tighten the screw on the P.I.N.D.A. holder again.

    • !!! DO NOT use glue to fix P.I.N.D.A. probe in the new type of holder with the M3 screw, you won't be able to release it again !!!

    • A correct height of the P.I.N.D.A. sensor compared to the nozzle should be similar to the last picture.

  4. Based on the examination of printers received back from the customers, we compiled a list of the most common problems causing poor print quality. Check them out and improve your 3D prints today!
    • Based on the examination of printers received back from the customers, we compiled a list of the most common problems causing poor print quality. Check them out and improve your 3D prints today!

    • Check the video here: https://youtu.be/Lsa-PXAXdKY

    • For other tips and tutorials go to: https://help.prusa3d.com/

  5. Firmware updater is now part of the PrusaSlicer (previously Slic3r PE). In case you have it already installed, you can skip to the next step.
    • Firmware updater is now part of the PrusaSlicer (previously Slic3r PE). In case you have it already installed, you can skip to the next step.

    • Go to prusa3d.com/drivers and select the MK3S printer.

    • Find the driver section and download the latest package. Leave this page opened for the next step!

    • Install drivers on your Windows, macOS or Linux system.

    • Part of the driver's package is PrusaSlicer (previously Slic3r PE), which includes a tool for firmware upgrade.

  6. ATTENTION!!! MK3 and MK3S have a different firmware. You must upgrade!
    • ATTENTION!!! MK3 and MK3S have a different firmware. You must upgrade!

    • Download the zip file with the firmware for the MK3S to your computer and unzip it.

    • To flash the firmware, the printer must be plugged and turned on!

  7. Open Slic3r PE and from the menu select Configuration ->Flash Printer Firmware Connect the printer to your computer using the bundled USB cable and select it from the menu. Hit Rescan if the printer is not on the list Select the firmware file on your harddrive (*.hex). Do not place the firmware on a network share.
    • Open Slic3r PE and from the menu select Configuration ->Flash Printer Firmware

    • Connect the printer to your computer using the bundled USB cable and select it from the menu. Hit Rescan if the printer is not on the list

    • Select the firmware file on your harddrive (*.hex). Do not place the firmware on a network share.

    • Hit the Flash button.

    • Wait until the process is completed. You can click on "Advanced: ..." to see the flashing process including detailed log.

    • When the flashing process is done, you will be informed.

    • We're done here! Your printer is ready to rock ;)

    • In case of issues with flashing the firmware please visit our troubleshooting article.

  8. Before you leave Slic3r PE, please add the MK3S printer profiles!!! You can also remove those for MK3. From the top menu select Configuration -> Configuration Wizard Look for the MK3S option and select it.
    • Before you leave Slic3r PE, please add the MK3S printer profiles!!! You can also remove those for MK3.

    • From the top menu select Configuration -> Configuration Wizard

    • Look for the MK3S option and select it.

    • Click Next, then Finish.

    • Expand the printer's menu and check if the MK3S option is present. If not, please repeat the process again.

  9. Put back the steel sheet and clean it with IPA to remove dust and grease. First, run the Calibrate Z to make sure the X-axis is absolutely level!
    • Put back the steel sheet and clean it with IPA to remove dust and grease.

    • First, run the Calibrate Z to make sure the X-axis is absolutely level!

    • Then run the 1st layer calibration as we moved with the P.I.N.D.A.

    • Re-run the first layer calibration until you are satisfied with the results.

  10. See our free 3D Printing Handbook - prusa3d.com/3dhandbookMK3S
    • See our free 3D Printing Handbook - prusa3d.com/3dhandbookMK3S

    • That's it, the assembly is over. Calibrate the printer according to the Handbook and you are ready to print!

    • We hope, you've enjoyed the build. Don't forget to leave feedback and see you in the next one :)

Finish Line

133 other people completed this guide.

Jakub Dolezal

Member since: 02/20/2017

222 Guides authored

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Prusa Research Member of Prusa Research

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364 Guides authored

15 Comments

During preflight check, noticed one lead to the heating element broke off. DOH!!!!!!

Byron Wingerd - Reply

Hello Byron,

Which element broke exactly? You can contact us via e-mail to info@prusa3d.com or via livechat directly regarding your issue and we will do our best to help you :)

Marcin M. - Official Prusa CS -

So, I waited on live chat for about 30-40min, and then sent an email to info@prusa3d.com and I haven’t heard anything back.

While I was waiting for a response, I replaced the the 24v 40W 6mm 21.5 mm ceramic heating element with similar part from a disreputable but fast vendor. I’ll get an other one from Prusa on the next order.

The printer passed all the calibration tests and after manually loading (feeding filament while adjusting the e-axis) It seems to print just as well as before. The autoload feature doesn’t work and the extruder can’t tell when it’s out of filament, it just kept printing. After it had been out for a while it parked and asked for more, but it couldn’t load and was just frozen so I couldn’t continue the print. (yes I did the MK3S update) .

The upgrade kit was fun and all, but I gotta say, that was a whole lot of trouble for a zero upgrade, and the feed might have worked better before I started.

How do I troubleshoot the new sensor?

Byron Wingerd - Reply

Is autoload turned on in the settings? When mine came up is was off from before the upgrade. Set it to on and life is good.

Paul Lamhut -

Hey Paul, it’s always turned off by default.

Filip M - Official Prusa CS -

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