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Print surface preparation

Last updated 2 months ago
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CSPLDEESITFR

Before you start printing, you should know that various materials have different adhesions on various surfaces. It is crucial to pick the right steel sheet for your printer and prepare its surface properly. This article is about the most common types of print surfaces and how to prepare them for printing.

To kick it off with a quick (and most common) example: PETG filament has great adhesion to a clean, degreased, smooth PEI sheet, making it extremely hard to remove. Removing the print often leads to peeling off the PEI surface and irreversible damage to the sheet. This is why we recommend using another type of steel sheet or adding PVA glue as a separation layer on the print surface.

Steel sheet damaged by a PETG print

Choosing the right print sheet

We offer 4 types of spring steel sheets, each has a different surface finish that leaves not only a specific texture on your print but also supports a variety of materials that can be printed on it.

Here’s a guidepost that provides the most information about the maintenance and properties of our three most common print sheets. Plus, here’s an article about our special PA Nylon steel sheet.

The best way to identify whether your sheet is suitable for the chosen material is by checking our Material table. If there’s a green check mark matching the selected sheet and material, you can simply degrease the print surface and you’re good to go. If there’s an exclamation mark, a separation layer of some sort is needed (see below). Failing to use the separation layer may lead to damaging your sheet!

Cleaning the print surface

This is an easy, yet crucial step you should perform before (almost) every print. We already described this in the 3D printing handbook and several other places but here’s a quick reminder:

Grease stains (fingerprints, etc.) often cause poor surface adhesion and, eventually, a print failure. To degrease the print sheet, spray some isopropyl alcohol (90% or stronger) or denatured ethyl alcohol on the cold print surface and wipe it with an unscented paper towel. Do not use any products for skin care: they usually contain oils that ruin adhesion!

There are some more specific rules for long-term sheet maintenance and you should definitely learn these but it reaches beyond this article’s purpose. Don’t forget to go through the steel sheet guidepost. Keep in mind that the special PA Nylon sheet has very different and highly specific rules for maintenance.

Alright, the print surface is clean, now the final checklist (see the material table):

  1. Green check mark: Good to go!
  2. Yellow exclamation mark: Use a separation layer (see below).
  3. Red X: Do not print! The chosen material may damage your print sheet!

Using the most common separation layers

You may find various separation (or adhesive) layer materials on the market, some of those even in our e-shop. Every material has its benefits, but describing every single one of them is beyond the scope of this article. If you check our material table, you’ll find out that it all comes down to two most common separation layers: PVA glue stick and PP tape.

PVA (paper) glue is usually sold in the form of sticks that make the application easier. Usually, only a thin layer of glue is enough. Spreading a thick layer may leave various unsightly traces, bumps, and artifacts that will be imprinted onto your 3D print’s surface. However, if you want to print a mechanical part, where good looks are not as important as functionality and reliability, making the layer slightly thicker won’t hurt. Also, the PVA glue melts at relatively low temperatures, so we suggest applying it on a cold surface to avoid making an extra thick layer.

Tip: If you use the smooth print sheet, use the grid to guess the print size and position, then spread the glue only under the 3D print. You don’t need to spread the glue all over the whole sheet.

PVA glue separation layer, 3D printed PETG parts, and marks left after removing the print. Note that these marks are normal as they are only on a PVA glue layer and not on the print sheet surface. These marks disappear with the glue after washing.

Finally, the PP tape. You will most likely not use it, since it’s recommended only for printing PP (Polypropylene), which is quite rare material to print. However, you may decide to use some other tape - kapton tape, for example. For the best adhesion, it is recommended to use in combination with a smooth sheet, no matter which tape you are going to choose. The tape may leave some glue residuals after removing it from the print sheet surface. Usually, these can be washed with IPA or with water and dishwasher soap, but again, double-check the steel sheet maintenance articles before washing them.

If you decide to use other separation materials or adhesives, don’t forget to check compatibility with our print sheets. For example, ABS juice should not be used in combination with textured or satin sheets.

Removing the print

One last thing: always remove the prints by removing and bending the sheet only after they are cooled down. The print will go off easily without the necessity of using various spatulas, knives, or anything else.

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