EN
  • Čeština
  • Español
  • Italiano
  • Deutsch
  • Polski
  • Français
  • 日本語
Login

First layer issues

Last updated 10 months ago
This article is also available in following languages: 
CSDEESFRITJAPL

This is by far the most common 3D printing problem, and probably the first one you may encounter. The first layer is the essential one because it is the base of the printed object. Therefore, if it isn’t perfect, the chance of print failure increases. Many common 3D printing problems stem from a poor first layer. There’s a couple of things that can go wrong when printing your first layer, so let’s take a look at what can be done to avoid these problems.

The print surface should be regularly maintained to achieve optimal printing quality and minimize the chance of failed prints. It's an easy procedure, so let's take a look at our tips and recommendations.

How to prepare your print-surface

If you don't touch the print surface with your hands or dirty tools, then you don't have to clean it before every print. Clean your tools the same way as you would the bed, and you will be able to start your next print right away.

Isopropyl alcohol

To achieve the best adhesion of the print surface, it is vital to keep it clean. The best option when printing with ABS, PLA, and many other materials is 90% Isopropyl alcohol, which can usually be sourced locally at drugstores or hardware stores. Denatured alcohol is also an option. We recommend always using 90% IPA. Lower percentage solutions may contain unsuitable chemicals and oils.

PETG, ABS, ASA, XT, and CPH filaments are an exception - the adhesion may be too strong, and you can damage your Smooth PEI sheet. We recommend using a separating agent (e.g. a glue stick). For more information on how to print with these materials, check out our Material guides.

Any cleaning agent (e.g. IPA) which is dermal/cosmetic, i.e. for skin or nails, may contain additives like moisturizers and oils which are not suitable.

Dish soap and water

If the adhesion seems to decrease over time even when using IPA, you can clean the steel sheet with a few drops of dish soap and warm water (not hot!). This should not be done often, and do not submerge the sheet completely in hot water, but it will dissolve some oils and sugars that gather over time and that IPA does not remove. Make sure to use only dish soap and dry the sheet well before using it.

Acetone

PEI can lose its adhesive powers after a couple of hundred hours. When you see models coming loose regularly, wipe the surface thoroughly with acetone to restore the adhesion. This should only be used in the smooth PEI sheet and only around once per month. Do not overuse acetone. Extended use makes PEI surface brittle. Also, do not use acetone before printing with PETG.

For the textured and the satin steel sheets, do not use acetone at all! Other chemical solvents, like Nail polish remover or brake-cleaner, can also contain acetone (acetates).

Glue

Glue is a great, easy-to-use tool to increase adhesion. It also creates a protective separation layer. No need for glue specially made for 3D printing. You can use a basic (PVA-based) glue stick. This is supplied with the printer. From our experience, it is not needed when printing PLA, but may it be advisable when printing:

You can easily wipe off PVA glue with dish soap and water.
Other types of glue should not be used as a substitute. Don't put Superglue on your sheet! When removing prints with a large surface area, you may have to assist the process using a spatula. Be gentle when flexing the sheet and removing the print as the smooth PEI foil can tear.

ABS juice

'ABS juice' should only be used on the Smooth PEI sheet, when printing ABS prints. It is a mixture of Acetone and ABS pellets. ABS scraps, brims, or failed prints can be used too. Be very gentle when applying the juice and do so only when the bed is cold. Prints will adhere very strongly.

Ready-made juice can be purchased in our e-shop. Unfortunately, most carriers do not allow shipping any acetone-based products via air transport due to shipping constraints.
For the textured and satin steel sheets, do not use ABS juice at all!

Resurface it

It can happen that you will leave some small marks on the print surface with your nozzle or tools. Typically, they will be shinier than the rest of the pad. It does not affect functionality or adhesion. However, if you want to have the same surface look on the whole print bed, you can resurface it.

The easiest way is to take the hard side of a dry kitchen sponge and gently wipe the affected area in a circular motion a few times. Another option is to use fine-grit sandpaper (400-600) and lightly give the sheet a rub. Wipe over with IPA after doing so.

steelsheet comparison

Smooth PEI sheet
  • Isopropyl alcohol 90%+ (IPA) - best degreaser
  • Warm water + few drops
    with dish soap (in case IPA doesn’t remove
    sugar residue on the sheet)
  • Acetone - once in a while to
    rejuvenate the sheet
  • Use glue stick when printing FLEX, PETG, and other PET-based materials, as well as ABS and ASA.
  • IPA + PETG will cause the print to adhere very strongly to the sheet. Removing it could be extremely difficult
Textured powder-coated
sheet
  • Isopropyl alcohol 90%+ (IPA) - best degreaser
  • Never use acetone!
Satin powder-coated sheet
  • Isopropyl alcohol 90%+ (IPA) - best degreaser
  • Never use acetone!
For more information on the different properties and guidelines of each flexible steel sheet, please see Flexible steel sheets (guidepost).

The nozzle is too close/far from the sheet

If the nozzle is too close to the printing bed, there won’t be enough room for the plastic to come out of the extruder. By having the nozzle too close to the print surface, you will essentially block its opening, so that no plastic can be extruded. You can easily recognize this issue when the printer does not extrude plastic for the first layer or two. Use Live Adjust Z function and First Layer Calibration (i3) options to tweak the height of the nozzle. You perform the calibration from LCD Menu –> Calibration –> First layer calibration. For more information on this procedure, please see the dedicated article First Layer Calibration (i3).

Avoid compensating for a lack of adhesion by setting a lower Live Adjust Z (squishing the first layer). If lowered too much, the nozzle can damage the steel sheet and cause excessive vibrations. Any damage caused by incorrect Live Adjust Z value is not covered by the warranty.

Speed and temperature

Decrease the printing speed

If the steps described above didn’t help, then try decreasing the printing speed. The easiest way how to do it is by rotating the knob during the printing process, lowering the percentage. Counterclockwise = decrease speed, Clockwise = increase speed. We suggest decreasing the speed to about 75% for the first three layers, then returning it to normal.

Use recommended printing temperatures

Make sure to use the recommended nozzle and heatbed temperatures. PrusaSlicer will configure them correctly based on the selected material, so you don’t need to adjust the temperatures manually on the printer itself. If you are experimenting with new materials that don’t adhere well, you can try to increase the heatbed temperature by 5-10 °C. This way the plastic will stick a bit better.

A full or partial clog

The extruder could be clogged. This can happen either when excessive debris gets stuck inside the nozzle, when hot plastic is kept inside the extruder for too long, or when the thermal cooling for the extruder is not sufficient and the filament begins to soften outside of the desired melt zone. Please see our dedicated article Clogged nozzle/hotend (MK3S, MK2.5S).

Uneven surface

If your print surface is not flat and the alignment of the mesh does not help, to achieve a flat print surface, a temporary solution is to add a piece of paper under the uneven area of the steel sheet. A more permanent solution would be to perform the firmware Bed Level Correction.

uneven sheet

Correctly placed sheet

Before printing, make sure that you have the print plate properly installed, and that there are no leftovers from the previous print or a piece of loose filament that could affect the sheet position. Also, make sure that the sheet is straight and not bent or damaged.

correctly placed sheet

Brim

Before you consider applying extra adhesion materials onto the bed, consider using the Brim option in PrusaSlicer which increases the surface area of the first layer. See our dedicated article Skirt and Brim.

Was this article helpful?

Comments

Please sign in before adding a comment.

Related

Still have questions?

Still have questions?

If you have a question about something that isn't covered here, check out our additional resources.
And if that doesn't do the trick, you can send an inquiry to info@prusa3d.com or through the button below.