Original Prusa i3 1.75mm MK1

Preparing the print surface and removal of the objects

  • It is important to prepare the print surface while cold. Ideally spray some ABS Juice on the surface and wipe it with paper towel. If you use ABS Juice spray on the hot surface, you will quickly have ugly buildup of ABS which can leave marks on the printed objects.
  • Remove the objects only when they cool down to room temperature. If they are still hot, the bond with print surface is too strong and you will have to use a lot of force to remove them. This can lead to loosing the calibration of the print surface or even damage on some parts.
  • The simplest way to completely clean the print surface is submerging it in warm water for 30 minutes. You can then simply clean the surface with towel. Next steps are one coat of glue on the clean glass and then before every print light coat of ABS Juice. Visual guide to preparing the print surface.

ABS

Nozzle temperature: 255 °C
Bed temperature: 90-105 °C (Bigger object bigger temp.)
Surface preparation: One coat of glue on a clean glass and then before every print light coat of ABS Juice. The glue is applied only before the first print or in case you cleaned the glass completely.

PET

Nozzle temperature: 240 °C
Bed temperature: 80 – 100 °C (Bigger object bigger temp.)
Surface preparation: One coat of glue on a clean glass and then before every print light coat of ABS Juice. The glue is applied only before the first print or in case you cleaned the glass completely.

PLA

Nozzle temperature: 210 °C
Bed temperature: 50 – 60 °C (Bigger object bigger temp.)
Surface preparation: Coat of glue before every print.

HIPS

Nozzle temperature: 220 °C
Bed temperature: 90 – 100 °C (Bigger object bigger temp.)
Surface preparation: One coat of glue on a clean glass and then before every print light coat of ABS Juice. The glue is applied only before the first print or in case you cleaned the glass completely.

FLEX (Polypropylene)

Nozzle temperature: 230 °C
Bed temperature: 50°C (Bigger object bigger temp.)
Surface preparation: Tape the print surface with regular packing tape (it is also made from Polypropylene).
Use the Flex setting from the latest drivers. It needs to be printed slowly.

Original Prusa i3 MK2

Preparing the print surface and removal of the objects

  • To achieve the best adhesion on the new surface, it is important to keep the surface clean. Cleaning of the surface is very easy. The best option is Isopropyl alcohol available in drugstores which is the best for ABS, PLA and others, except for PETG where the adhesion may be too strong (See PET for instructions). Pour a little amount on unscented paper towel and wipe the print surface. The bed should be cleaned while cold for the best results but it can also be cleaned when already preheated for PLA, just be careful not to touch the bed surface or the nozzle. When cleaning at higher temperatures the alcohol will evaporate before it can clean anything. Alternatively, you can clean the bed with warm water and a few drops of a dish soap on a paper towel. Denatured alcohol is yet another option.
  • You can leave small marks on the print surface with your nozzle or tools, they will typically be shinier that the rest. It does not affect the functionality or adhesion. However if you want to have same surface look on whole printbed you can resurface it. Easiest way is to take a hard side of dry kitchen sponge and wipe the affected area with circular motion gently few times.
  • When printing is finished let the nozzle and heatbed cool down before removing the printed object. Always handle the printed objects when temperature of the bed and nozzle drop to the room temperature, when the bed is hot objects are very hard to remove. Pull the bed towards you and remove the object gently.
  • If you experience any troubles removing the object (especially the small ones) you can use a flat tool like a spatula with rounded corners to prevent damage of PEI. Slide the spatula under the corner of the object and gently push, until the print pops of.

ABS

Nozzle temperature: 255 °C
Bed temperature: 90 – 105 °C (Bigger object bigger temp.)
Surface preparation: Make sure the surface is clean.

PET

Nozzle temperature: 240 °C
Bed temperature: 80 – 100 °C (Bigger object bigger temp.)
Surface preparation: Make sure the surface is clean. Do not use isopropyl alcohol to clean the bed, or the adhesion may be too strong, if you do not have anything else on hand use the bundled glue as a separator after cleaning it. Windex or similar windows cleaner is great option for PET and you don’t need to use the glue after the cleaning. Pour a little amount on unscented paper towel and wipe the print surface.

PLA

Nozzle temperature: 215 °C
Bed temperature: 50 – 60 °C (Bigger object bigger temp.)
Surface preparation: Make sure the surface is clean. This material only is proven for 50 microns layer height.

HIPS

Nozzle temperature: 220 °C
Bed temperature: 90 – 100 °C (Bigger object bigger temp.)
Surface preparation: Make sure the surface is clean.

FLEX

Before you start printing from Flex, clean the nozzle from the previous material – preheat the nozzle and load PLA to remove any other previous material. When loading Flex loosen the extruder (idler) screws. Keep in mind that when printing from Flex the automatic filament exchange function may not work properly.
Nozzle temperature: 210 °C
Bed temperature: 50 – 60 °C (Bigger object bigger temp.)
Surface preparation: Make sure the surface is clean. Some very soft flex materials can bond to the bed too much and require to use glue on the bed as separator to prevent PEI damage.

PP

Nozzle temperature: 254 °C
Bed temperature: 95 – 100 °C (Bigger object bigger temp.)
Surface preparation: The best results are obtained with common scotch tape – just attach the tape directly to the print surface and clean it after the print is finished.

Nylon (Taulman Bridge)

Nozzle temperature: 240 °C
Bed temperature: 80 – 90 °C (Bigger object bigger temp.)
Surface preparation: Use one coat of gluestick. Clean as described after the print.

Increasing the adhesion

  • In some special occasions, like tall object with very small contact area with print surface, you might need to increase the adhesion. Fortunately PEI is very chemically resistant polymer and you can temporary apply other adhesion solutions without damaging it.
    This also applies to materials which would not stick to PEI otherwise, like Nylon etc.
  • Before applying anything to the bed, consider using Brim option in Slic3r which increases the surface area of the first layer.
  • For PLA and Nylon blends simple glue stick does the trick. Glue can be later easily removed by window cleaner or dish soap water.
  • For ABS prints, ABS juice can be used and later cleaned with pure acetone. Be very gentle when applying the juice and do so while the bed is cold. Prints will attach very strongly.