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✔️ Tips

How to store Sinterit powders?

To be sure that the Sinterit powder is dry and ready for printing, You have to follow a few rules:

  • Store the powder in room condition ( ~23°C and 50% humidity – the lower humidity the better)
  • Always store the material in a sealed dry box/container.
  • Do not leave the container open.
  • Clean the machine right after the printing and store the material immediately after removing the print cake. 
  • Do not let the powder stay in the printer for more than a couple of hours.
  • Put a few silicone absorbers into the container (but do not forget about them when filling the printer)

Is it possible to dry Sinterit powders?

The first sign of Sinterit powder water absorption is when it becomes sticky and dark. It may stick to the overflow bin, metal elements, and the recoater rotary shaft. The wet powder is not always granulated. 

To dry your powder you can try putting it in the regular kitchen oven for 3-4 hrs at 100℃. Put the powder into a tray. Spread the powder so there is a 2-4cm layer of it in the tray. Stir it from time to time. Fan forced circulation in the oven is also a good idea.

The nylon powders are highly hygroscopic and if they absorb water, they are very difficult to dry out. If the powder reaches high humidity it will become useless and the only solution is to purchase new powder.

What location to choose for the printer installation?

As SLS printers are temperature sensitive, it is recommended to place the unit away from ventilation ducts or air conditioning units. To ensure that each side of the printer is at the same temperature, it is recommended for the printer to be placed at a distance from the wall. If one side is significantly cooler, the temperature sensors inside the printer might read an incorrect temperature.

For best performance, the printer should be placed on level ground on the Sinterit Platform.

How can I clean the printer?

It is very important not to use isopropyl alcohol on any parts of the printer. It might damage the pyrometer window module and discolor painted surfaces of the unit.

Regular alcohol-based window cleaner is recommended for the majority of surfaces. But pure (at least 95%) ethyl alcohol is recommended for the pyrometer window modules.

Using other solvents or cleaning solutions might damage the pyrometer window modules and affect print quality. 

When cleaning the printer with a vacuum cleaner remember to use a Sinterit ATEX-certified Vacuum Cleaner. Using uncertified vacuum cleaners may lead to starting a fire or explosion.

🔧 Maintenance

How can I replace a worn-out recoater cord?

The recoater cord is a consumable part and has to be replaced after 200-300 printing hours.

  • prepare a new recoater cord and a 2mm hex wrench
  • turn the printer on and open the printer lid
  • turn the printer off and unplug the power cable
  • move the recoater arm by hand to the middle of the printing chamber
  • remove two black screws on the side (Lisa)/top (Lisa Pro) of the recoater arm
  • remove the black recoater cover
  • unscrew the recoater cord from both sides
  • (Lisa) unscrew the mounting plate off the cord
  • remove the cord
  • thread the new cord through the recoater arm, remember to place the spring on the overflow bin side.
  • (Lisa) screw the mounting plate to the new cord
  • screw the recoater cord in
  • reinstall the recoater cover

How can I replace a broken short infrared heater?

If you notice that one of the short infrared heaters does not light up – a broken heater needs to be replaced before starting a print When replacing the short infrared heaters put on protective gloves (make sure not to leave any oil residue on the glass or it will break)

  • turn the printer on
  • open the printer lid
  • turn the printer off
  • remove broken the short infrared heater by pulling it out of the socket
  • prepare a new heater
  • make sure that the new heater voltage matches with the old one. You can find nominal voltage printed on the infrared heater.
  • insert a new short infrared heater into the socket (make sure that the white coating is facing the laser protective glass)

How to update the printer firmware?

It is a good idea to update the printer firmware regularly. Firmware updates contain stability and user experience improvements. 

  • prepare a USB drive
  • open the file manager on your Windows PC
  • format the USB drive in FAT32 (This will erase everything on your flash drive)
  • go to the Sinterit Studio software on your PC
  • select “Update printer” in the “Help” tab
  • select your printer type and USB drive.
  • create USB update drive
  • go to your printer, make sure that the printer is turned off. 
  • insert drive into the printer USB port
  • turn the printer on, wait until the update is completed
  • remove the USB drive
  • power cycle the printer.

How can I clean the recoater arm?

Powder residue can accumulate on parts of the recoater arm. In order to clean the recoater arm:

  • prepare 4mm hex wrench
  • turn on the printer and open the printer lid
  • turn the printer off
  • remove the black recoater cover and recoater cord (see “How can I replace a worn-out recoater cord?” in this section.)
  • remove the two screws connecting the linear bearing and recoater arm
  • remove all the powder residue using compressed air and a brush
  • install the recoater arm back in the printer, make sure that the recoater arm is at the right angle in relation to the recoater arm guide shaft.
  • reinstall the recoater cord and recoater cover

How can I remove melted powder residue?

The best way to remove the melted powder residue on the walls is to use a very sharp blade – be gentle to avoid scratching the cylinder wall. You can also consider using a brass brush with soft bristles, that won’t scratch the surface of the cylinder walls.

How can I remove brown residue off the laser protective glass?

It is recommended to clean the laser protective glass regularly. 

  • Remove the reflector split pin, be careful not to let the reflector drop.
  • Loosen two quick release nuts be careful not to let the laser protective glass drop.
  • Remove the laser protective glass.
  • We strongly recommend using salicylic spirit or a standard window cleaner (containing alcohol). Use a soft cloth for this purpose, don’t use paper towels. Do not use any strong chemicals.
  • Reinstall the laser protective glass.

⚠️ Troubleshooting

A yellow triangle with the number 202 appears on the screen.

Error #202 indicates a low oxygen level in the room. Make sure there are no leaks on nitrogen tanks and the nitrogen flow is cut off. Ventilate the room for at least 2 hours. If the issue persists please contact Sinterit Support.

A yellow triangle with the number 84 appears on the screen.

Error #84 indicates a communication issue within the printer. This error doesn’t affect the print quality and should go away after the printer firmware update. Please see “How to update the printer firmware?” in the Maintenance section. If the issue persists please contact Sinterit Support.

I can’t see models in the Models tab in Sinterit Studio software.

Some rendering methods might have problems working with Windows PCs which cause the models in Sinterit Studio not to appear correctly. In order to change the default rendering method:

  • go to the Setting tab and select Display settings
  • choose OpenGL or OpenGL ES to see which rendering method works best with your PC

The recoater arm vibrates when moving.

Sometimes you can see that the recoater arm is vibrating when moving (eg. during levelling procedure). This might be caused by insufficient oiling of the recoater guide shaft. To make sure that the recoater linear bearing is moving smoothly:

  • turn the printer on
  • go to the Advanced mode and then to the Mechanics tab,
  • move the feed bed down, (approx. 2cm below the printing chamber level)
  • start the levelling procedure
  • apply the silicone oil on the recoater guide shaft generously.
  • repeat applying through a few recoater passes

 

Cleaning the recoater arm and replacing the recoater cord might also help minimize recoater arm vibrations. (see “How can I replace a worn-out recoater cord?” and “How can I clean the recoater arm?” in the Maintenance section)

If the issue persists please contact Sinterit Support.

Unsatisfying quality of printouts

If the printout doesn’t meet your expectations, first check if the models’ geometry and placement is correct. You can download the “How to position models” tutorial from the Sinterit website. 

 

If the geometry and positioning of the models are correct, check if:

  • all of the short infrared heaters are lighting up, 
  • the recoater cord is in good condition,
  • the powder is in good condition, 
  • the pyrometer window modules are clean
  • the recoater arm is moving smoothly

If the issue persists please contact Sinterit Support.

Sinterit Studio shows message “The model file is invalid (negative volume). It may produce incorrect *.scode files. Do you want to load it anyway?

Sometimes, when exporting your 3D models as *.stl files an error may occur which causes the file to save with a gap between some polygons. Sinterit Studio cannot print such a file. If you have a faulty *.stl file:

  • go to Microsoft 3D Builder (you can download this app for free from Microsoft Store on your Windows 10 PC),
  • open the *.stl file,
  • click import model in the top right corner,
  • an error message will appear in the bottom left corner
  • click fix to fix the problem the process might take a short while
  • save the new *.stl file
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