Academy

While using an FDM 3D printer, you may need to replace the hotend. In fact, a little space between the heatbreak and nozzle, or a failure of the heatsink fan, or any other type of problem could cause a clog that prevents normal extrusion during printing, and the only way to repair the fault is to disassemble or replace the hotend.

Replacing the hotend is an easy procedure but one that requires the utmost attention.
In order to proceed with the replacement, follow these steps.

Disassembly

1) Unscrew the screw that holds the thermistor in place and remove the thermistor and temperature sensor

2) Disassemble the Hotend, then unscrew the screw that holds the Heatsink in place and remove the heatsink.

3) Remove the PTFE tube from the heatbreak.

4) In case the end of the PTFE tube is damaged, cut the damaged part, taking care to make a vertical cut at 90 degrees; an inaccurate cut will cause molten material to leak during printing, causing a new clog. In order to proceed to a precise cut, it is recommended to use a "PTFE cutter" available as an accessory for 3D printing or you can proceed to print an STL file by searching on Thingiverse for "PTFE cutter."

Replacement

1) Screw the Heatbreak correctly into the heatblock.

2) Screw the Nozzle into the Heatblock

3) Install the Heatsink

4) Mount the Hotend on the 3D printer

5) Unscrew a little the Nozzle (about half a turn), then insert the PTFE tube until it hits with the nozzle.

6) Insert the thermistor and the temperature sensor into the block, fixing them with the appropriate screw

7) Heat the Hotend up to 200°C, then screw the Nozzle well so that it is tight with the PTFE tube and the heatbreak.

Once you have completed these steps, the new hotend will be ready to use.
The correct assembly ensures good operation and avoids new clogs due to leakage of molten material between the heatbreak and the nozzle.

https://www.longer3d.com/products/lk5-pro-fdm-3d-printer

All Longer 3D printers offer excellent performance and guarantee high print quality, however some users love to install upgrades useful to change the aesthetic appearance or characteristics of the printer. For this reason, this article intends to present some of the most installed upgrades by users, offered by @Ciubecca Nicola.

1) LONGER LK4Pro & LK5Pro Display Cover

This upgrade allows you to install a cover on the display of the Longer LK4PRO & LK5PRO printers, so as to protect the screen from dust when the printer is not in use

Download link: https://www.thingiverse.com/thing:4929422

2) LONGER LK4Pro & LK5Pro Adjustable LED Light Bar Mount

This upgrade allows you to install a lamp through an adjustable stand, so as to obtain a good illumination of the printing plate of LK4PRO & LK5PRO.

Download link: https://www.thingiverse.com/thing:4980580

3) LONGER LK4Pro & LK5Pro Mini SD Card/USB Holder

This upgrade allows you to install a holder for microSD cards, USB pendrives and SD cards, so you always have any type of flash memory next to the printer

Download link: https://www.thingiverse.com/thing:5230892

4) LONGER LK4Pro & LK5Pro Front rail cover with Bed Leveling Reminder

If you do not need the previous Card Holder, then this upgrade can be a good choice; this upgrade is a reminder that allows you to remember from which direction you have to turn the leveling knobs to raise or lower the printing surface

Download link: https://www.thingiverse.com/thing:4981797

5) LONGER LK4Pro & LK5Pro Screw Cap

An upgrade as simple as it is functional, of the simple caps to cover the screws of the aluminum frame of the LK4PRO & LK5PRO printers. Choose your favorite color to customize your printer to the maximum!

Download link: https://www.thingiverse.com/thing:5186277

6) LONGER LK4Pro & LK5Pro Spool Clamp

Some filament coils tend to move on the Spool Holder; therefore, if this is a problem for you then you can install this upgrade, which allows you to hold the coil in its position

Download link: https://www.thingiverse.com/thing:5186749

7) LONGER LK4Pro & LK5Pro Flexible Arms

This upgrade consists of a flexible arm, which was used to install a camera that can record the printing process. However, if you have a different camera or if you don't need a camera, then you can modify the original design and use the flexible arm for any kind of customization you have in mind. Bring your ideas to life!

Download link: https://www.thingiverse.com/thing:5186245

Our Longer LK4 PRO and LK5 PRO 3D Printers are very similar, but the differences between them are not limited only to the different printing area, but on the LK5 PRO there are other small improvements that make this printer much superior to LK4 PRO.

However, if you already own an LK4 PRO and do not intend to buy LK5 PRO as well, here is a series of tips to make your LK4 PRO like a mini-LK5PRO, thus improving its printing capacity and hardware structure.

1) Hotbed Cable Bracket Holder

The LK4 PRO has a Hotbed power cord simply connected via a clip-on connector. This, as a result of repeated movements during printing, may disconnect, bend or break; for this reason it is really important to install a cable bracket that makes the connection fixed, exactly as for LK5 PRO. About that:

1. Download the official Bracket Longer: https://www.thingiverse.com/thing:4818795
2. Print it using 0.1mm Layer Height & 100% Infill as recommended settings
3. Proceed to the installation as follows:
   • Unscrew and remove the 4 leveling knobs, remove the hotbed
   • Place the bracket on the metal plane, place the leveling spring in the bracket compartment
   • Assemble the hotbed again and screw in the 4 leveling knobs
   • Attach the cable to the Bracket using two fixing clamps
4. Here is the final result:

2) Mainboard fan protection grid

The LK4 PRO's mainboard fan does not have a protective grid like that of the LK5PRO, so if you don't have a compatible metal grid then you can install a printed one. About that:

1. Download the official Longer mainboard grid:

https://www.thingiverse.com/thing:4957827

1. Print it using 0.1mm Layer Height & 100% Infill as recommended settings
2. Proceed to the installation as follows:
   • Unscrew the 4 mainboard fan screws
   • Place the grid
   • Start the 4 screws
   • Note: Due to the grid, you need to use 4 screws longer than the originals
3. Here is the final result:

3) Spool Holder on the side

The LK4 PRO printer provides for the installation of the Spool Holder at the top; however, if you prefer to install the Spool Holder on the side of the printer, as for LK5 PRO, here is a practical upgrade to print and install easily:

1. Download the official Longer bracket for Spool Holder: https://www.thingiverse.com/thing:4957817
2. Print it using 0.2mm Layer Height & 100%Infill as recommended settings
3. Proceed to the installation as follows:
   • Attach the original Spool Holder to the Bracket, using two bolts of correct size
   • Attach the bracket to the printer using at least two T-Nuts
4. Here is the final result:

4) Ultrabase Plate in Micro-perforated Latex

Differently from LK5 PRO, which is equipped with a Micro-perforated glass plate, LK4 PRO has a glass plate covered with a rough ceramic film, excellent for having a perfect print adhesion, however it may often be difficult to remove the prints from the glass, as the adhesion remains unchanged even with a cold plate.

For this reason, it could be a good solution to proceed with the installation of a Micro-perforated glass plate also on the LK4 PRO, so as to obtain excellent adhesion during printing and easy removal of prints from the cold plate. In fact, the Longer Micro-perforated Latex plate is equipped with micropores, which with heat (starting from 60 °C) it "sticks" to the first printing layer, thus ensuring excellent adhesion as long as the plate remains hot. At the end of printing, cooling the micropores gradually it releases the printed surface, so the printed object will simply be placed on the plate and can be easily removed.

This upgrade can be got really easily, as it can be purchased at all our official Longer stores, at a very low price:

• Longer Official Store:
  https://www.longer3d.com/collections/lattice-glass/products/ceramic-coated-glass-to-longer-lk4-lk4-pro
• Longer Amazon Store:
  On your local Amazon website
• Longer Aliexpress Store:
  https://a.aliexpress.com/_v4j7KG

Once you install all these upgrades, your LK4 PRO will be like a mini-LK5 PRO!
Our guide ends here, but if you need more spare parts or would like to make extra upgrades, then do not hesitate to contact us on our Official Longer Facebook pages or at our email address:  support@longer3d.com

https://www.longer3d.com/products/lk5-pro-fdm-3d-printer

First of all

LONGER LK5 PRO firmware download: https://drive.google.com/drive/folders/1xvMYLhAvwqhYiqoT559U8gBzruGjQ_AE?usp=sharing

1. About LK5 PRO install steps

If you find it lost, please contact our technical team at support@longer.net; after confirmation, we will resend the new part to you.

We make video tutorials about installation steps; please follow:

https://www.youtube.com/watch?v=F_VzVxOhHSo

2. First turn on

The touch screen is not bright

Confirm whether the input voltage range of the switching power supply is consistent with the electricity voltage in the area and the screen cable is connected.
If still does not work, check the power indicator and the mainboard indicator (method: remove the bottom mainboard protective cover; refer to the video in the link below.)

https://www.youtube.com/watch?v=K8Jwu-faDfQ

Fan noise and abnormal sound.

Make sure that the fan blades are not damaged and that there are no foreign objects. You can email fan photos to support@longer.net help you confirm.

3. Leveling bed

The distance between the hot end nozzle and the hot bed is 0.1-0.2 mm. follow below video leveling bed: https://www.youtube.com/watch?v=TJ0MOFPuOTQ. If it still can't be solved, put the hot bed glass and aluminum substrate on a flat table to check whether there is bending, if the bed bending, contact LONGER 3D technical team: support@longer.net

4. Zeroing failed

Failed to return to zero/abnormal noise of return to zero/impact limit still does not stop motion. Please check whether the limit switch is complete and the installation condition, and follow the video: https://www.youtube.com/watch?v=m3sQGZVFDqY., check the cable installation condition.

About the Z-axis limit switch height adjustment, refer to the video in the link below.
https://youtu.be/F_VzVxOhHSo?t=255

5. Load/unload filament

Error8

Check the real-time hot-end temperature display on the screen. If it is negative, check the installation of the thermistor plug; make sure it is installed as below:

If anything good about thermistor, that is hot end issue, in this case we should follow the below video to change hot end: https://www.youtube.com/watch?v=RwpLTFwFzAg

Error0 or Error12

Check the installation of the hot-end thermistor and the plug of the hot-end heating rod.
If the installation is normal, the cable may be broken. Replace the hot end;

The extruder is not working

1. Check the installation of the extruder cable plug (E refers to the extruder).
   2. The extruder defaults to work after reaching the hot end set temperature (minimum 195 degrees). If it still cannot work, check the installation of the extruder motor wire.
   3. If it still can't work, exchange the X and E motor wire plugs, control the movement respectively, and report the situation to the after-sale service.

Filament cannot be extruded

When, without loading the filament, the extruder works fine, this situation is a hot end block. When the filament is not loaded, the extruder works abnormally; please contact the after-sales service directly support@longer.net

Nozzle smoking

Check the thermistor is completely detached or loosely installed (check when cooling); reinstall it.

6. Start printing

If LK5 PRO printer does not recognize the Micro SD card file

Use a tool to format the Micro SD card and reload the file.
Micro SD Card Formatting Software
https://drive.google.com/drive/folders/1TgCT1CBsjI4-7prSu1nEUXxQ6vhsJzms?usp=sharing
Micro SD card preload file download address
https://drive.google.com/drive/folders/1zz5mlLMBoa3DguuyG6YDHJJXnhL-XKnJ?usp=sharing
Dip the SD card in alcohol, pull out and insert it into the SD card slot several times. Wait for the alcohol to evaporate completely, and restart the machine to check whether it works again.

If still not work, contact LONGER 3D technical team: support@longer.net

Newly added files not recognized

LONGER LK5 PRO recognizes the Gcode file in the root directory of the Micro SD card and checks the format of the newly added file.
P.S. Gcode files can be generated by slicing software.
If still not work, contact LONGER 3D technical team: support@longer.net.

Error 9

Check that the touch screen displays the real-time hotbed temperature, and if it is negative, check the installation of the hotbed cable plug.
The cable is installed normally. Use a multimeter to check the resistance of the aluminum substrate.
video about measure the resistance of the hot bed socket: https://www.youtube.com/watch?v=yFV3JCilzA8

If still not work, contact LONGER 3D technical team: support@longer.net

Error 1/13

Check the heatbedcable plug installation.
Check the resistance of the aluminum substrate. If it is normal, replace the cable for testing. If the cable is still abnormal, contact LONGER 3D technical team: support@longer3d.com

The print size is too small

Check the computer slicing software to set the print format.
If this does not resolve, check the printer firmware information.
PS: LK5 Pro firmware and update guide files can be downloaded at the link: 

https://drive.google.com/file/d/1rRos32XckF5ZlI5tYlCTlyt22E_BlQXP/view?usp=sharing. 

LONGER LK5 PRO 3D printer firmware upgrade in this article:

https://www.longer3d.com/blogs/academy/longer-lk5-pro-full-use-tutorial Filament not sticking to platform

Check whether the slicing software parameters are the default parameters of the Cura Longer machine, and try to relevel (the proper distance between the nozzle and the printing bed is the thickness of a sheet of A4 paper). For leveling the bed, check the video in the link below.
https://www.youtube.com/watch?v=TJ0MOFPuOTQ
After leveling bed, add "ralf" while slicing the model
If still not work, please check, Check if the heat bed is bent in  3, Leveling bed

Filament not extruded

1. When the motor shaft of the extruder rotates, the engagement gear does not rotate; install the engagement gear fixing screw.
2. If the extruder does not work, switch the motor test; refer to the video.
https://www.youtube.com/watch?v=XCjrieoyZ1c
3. If the distance between the hot end nozzle and the hot bed is too close, relevel it.
4. If the hot end is blocked, replace the hot end. Refer to 5.4 for the inspection method.

7. Other issue

Wrong firmware

Download the LK5 Pro firmware and update the guide file and update the firmware:
https://drive.google.com/file/d/1rRos32XckF5ZlI5tYlCTlyt22E_BlQXP/view?usp=sharing
Refer to 6.5.

During the printing process

If the power input is normal, it still display "Resume printing." In this situation, please update the firmware to the Marlin 2.0 version. the following is the firmware download link:
https://drive.google.com/file/d/10mY1k7CIIJYEa2HbqzdXNSre7h4x6Zfa/view?usp=sharing

Refer to the link below for the firmware update tutorial.
https://www.longer3d.com/blogs/academy/longer-lk5-pro-full-use-tutorial
After updating the firmware, the problem still cannot be solved; contact LONGER 3D technical team at support@longer.net

bending, After the printer turned on, the touch screen is stuck on the boot page, and the firmware cannot be loaded, please confirm the touch screen cable is connected situation, if cable not issue, please contact LONGER 3D technical team: support@longer.net

Last mont LONGER 3D release a new accessories for FDM 3D printers.

This dual blower kit perfectly fit for LONGER LK4/LK4 PRO/LK1/LK5 PRO and compatiable with U20/U30/U30 PRO 3D Printer, improves the quality of printing, have strong power on cooling nozzle to get a better and smooth surface of model.

And installation steps, some 3D printers fans didn’t know. Now you can follow our turorial step by step.

https://www.youtube.com/embed/zEA-eM5sfho

So install new dual blower kit for your FDM printer, you need remove the old hot end fan cover and sheet metal first, the fixed the new dual blower kit in the gantry beams, connect the fan wires in order, then done.

Ps: The plugs do NOT get replaced the same as the stock fan, they must be switched exactly opposite. (Former red/black gets new blue/yellow & visa versa.) 

If you going to install BL touch, please download support bracket for the BL Touch. 

Longer 3D collect all 3D printers coupon in discount  page. If you need 3D printers or upgrade part from LONGER 3D, check the link and find out coupon code you need.

Original post: https://www.longer3d.com/blogs/academy/longer-new-dual-blower-kit-installation-tutorial

https://www.longer3d.com/products/lk5-pro-fdm-3d-printer

A Detail Guide about LONGER LK5 Pro Upgrades and How to Upgrade LONGER LK4 Pro in Easy Steps

1.Since the motherboard of the LK4 Pro, LK5 Pro printer is an open source motherboard, use electrical tape to paste the pins on the side of the USB cable socket before connecting to the computer to isolate the computer from supplying power to the printer motherboard. If the pins are not attached, the printer will not work properly use.

2.To connect the computer to the printer, you need to install the driver, which can be installed on the LONGER official website. The official website link is as follows:

https://www.longer3d.com/blogs/news/printer-download-guildelines

3.After pasting the pins of the USB cable with tape, you can connect the printer to the computer, and then you need to update the printer's firmware through the slicing software cura.

4.Cura software version 4.8 or 4.9 does not add a LONGER printer by default. You need to add it manually. The following link is the video of adding a LONGER printer to cura4.8 or 4.9. Refer to the video in the link to add a LONGER printer;

MAC OS: https://www.youtube.com/watch?v=XKqRb434USw&t=6s

WINDOWS: https://www.youtube.com/watch?v=jdLYBYFEBlQ&t=9s

If the computer cannot connect to the printer, please refer to the video operation in the link below.

https://www.youtube.com/watch?v=KwmKZmtTOPw&t=10s

5.Next, you need to save the firmware to your computer. The firmware link of the corresponding model is below:

https://drive.google.com/file/d/11X1MZV4ll47kG4dhw2PgXniOwwo7UkmP/view?usp=sharing

6.After the firmware download is complete, please turn on the printer power, connect the printer to the computer, open the cura software, and select the "MONITOR" page to control the printer. And the firmware update is also completed on this page.

Next, on the "Monitor" page, select the corresponding model to update the firmware, and then click "Manage Printers", the operation is as follows

Click "Update Firmware" in the pop-up "Preferences" option box, refer to the figure below.

In the pop-up "firmware update" prompt box, click "upload custom firmware"

Then select the file with the suffix format ".hex" in the firmware installation package to upload, and you can start to update the printer's firmware. Do not cut off the power of the printer or turn off the computer during the firmware update process, and also ensure that the USB cable is properly connected.

LONGER LK5 Pro FDM printer base on 300x300x400mm printed size, if you interested, check the page get more detail: https://www.longer3d.com/blogs/academy/longer-lk4-pro-lk5-pro-3d-printer-firmware-update

Article source: 

When there's issue of exturder from Longer LK1/LK4/LK4 PRO/LK5 PRO 3d printer, how to fix it? There are usually two reasons in which the extruder works abnormally.

1. Clogged nozzle
In this case, you can refer to the method of cleaning the nozzle above.
2. Damaged extruder
You can exchange the extruder cable with the X-axis cable. Start the machine, control the X axis, and let the extruder work. Observe if they work. If the X-axis is working properly, then the extruder motor is malfunctioning. At this time you can only replace with a new motor.
But if the X-axis does not work after the cable is exchanged. It may be a cable or motherboard failure. At this time, change the Y-axis cable to the extruder, and the motherboard's extruder port cable to the X-axis. If the X axis is working properly, then the cable is intact. If the X-axis still does not work, it means that the motherboard and cable need to be replaced with a new one.
You can refer to the video in the link below.

Watch video get more detail: https://youtu.be/XCjrieoyZ1c

https://www.longer3d.com/products/lk5-pro-fdm-3d-printer

Here's some videos to check on LK4 PRO if you face some setting problems or errors. 

• Quick Start - LK4 Pro How to Solve Printing Stopped after Pre-heating
• Quick Start - LK4 Pro Hotend Components Replacement
• Quick Start - LK4 Pro How to Adjust X Y Z Axis
• Quick Start - LK4 Pro Main Board 4010 Fan Replacement
• Quick Start - LK4 Pro How to Adjust the Shaking of the Machine Base
• Quick Start - LK4 Pro How to Deal with No filament
• Quick Start - LK4 Pro Teflon Tube Replacement
• Quick Start - LK4 Pro How to Solve Error 0
• Quick Start - LK4 Pro How to Solve Error 8 Error 10
• Quick Start - LK4 Pro How to Solve Error 1

If the problem is still on, please reach this link to fulfill the [support form] and our support team will follow up the case and provide the solution ASAP. 

Or you would send the email by some issue description to support@longer3d.com 

https://www.longer3d.com/products/lk4-x-fdm-3d-printer

Reach this link to watch how to add LONGER 3D Printers into latest Cura software. And get more knowledge about longer lk4 pro cura settings, longer lk4 cura settings, and longer lk5 pro cura settings.

Add Longer 3d printers into Cura 4.8

To download the resources files of LONGER >>[Resources files]<<, with latest printing parameter, the quality of printing will be perfect on conifguration. 

https://www.longer3d.com/products/lk5-pro-fdm-3d-printer