Bed adhesion · surfaces

Build Plate Guide: Which Surface for Which Material

The surface is the first decision and most people inherit it rather than make it. Textured PEI grips PLA and PET-G beautifully and gives ABS very little to hold. Smooth PEI grips everything, including PET-G hard enough to damage itself. Glass is flat, cheap and chemically neutral, and needs help with everything. Garolite is the one surface Nylon really bonds to. Below: what each one is good at, what it costs, and how it fails.

The surface table Textured vs smooth PEI

Vijay Raghav VaradaPublished 13 September 2026

6 surfaces compared12 materials mappedHow each one fails, not just how it worksMeasured on our own machines

The six

What Each Surface Is Actually For

Textured PEI (powder-coated)

Holds by mechanical key: the polymer flows into the texture and locks. Excellent for PLA, PET-G and TPU, and it stamps its pattern onto the underside of the part, which most people like. Weak on stiff, hot materials — ABS and PC do not flow into the texture well enough to key. Very durable; the coating eventually polishes flat in the places you print most.

Smooth PEI (sheet or film)

Holds chemically, and holds almost everything. That is also its problem: PET-G bonds to it hard enough to tear chips out, so it needs a release layer for that one material. Gives a glossy bottom surface. The film type scratches and bubbles; the solid sheet type lasts far longer and costs more.

Glass (borosilicate or mirror)

The flattest cheap surface there is, chemically neutral, and completely reusable. It holds nothing on its own, which makes it honest: every material needs an adhesive layer, and every material then works. Heavy, slow to heat, and it shatters if you drop it or pry a cold part off it too hard.

BuildTak and PEX-type sheets

Tough polymer sheets with a fine texture. Good general-purpose grip including on ABS, and forgiving of a slightly-too-close nozzle. They are consumables: the surface gouges when a nozzle digs in, and a gouge is permanent. Budget for replacements if you level by feel.

Garolite G10

Glass-epoxy laminate, and the surface Nylon actually bonds to — Fracktal publishes it as the recommended plate for both PA12 and CF-PA. Niche, because outside Nylon and PA-based materials there is no reason to own one. Sand it lightly to refresh it; do not print PLA on it and expect to get the part off easily.

Spring-steel flex plates

A carrier rather than a surface — they come coated with PEI, PEX or a powder texture, and everything above still applies to the coating. What they add is removal: flex the plate and the part pops off, which is the single biggest reduction in surface damage available, because nobody has to attack a part with a scraper.

Material by surface

What Holds What

Material	Bed	Textured PEI	Smooth PEI	Glass	Best answer
PLA	0–60 °C	Excellent	Excellent	With adhesive	Any of them
PET-G	60–85 °C	Good	Too good — use a release layer	With adhesive	Textured PEI + release layer
CF-PET-G	70–85 °C	Good	With adhesive	With adhesive	PEI + adhesive
TPU 95A	0–60 °C	Excellent	Excellent	With adhesive	Textured PEI
ABS	95–110 °C	Weak	With adhesive	With adhesive	Smooth PEI + Plus
ASA	95–110 °C	Weak	With adhesive	With adhesive	Smooth PEI + Plus
Polycarbonate	80–120 °C	Weak	With adhesive	With adhesive	PEI + Plus, enclosed
PC-ABS	100–115 °C	Weak	With adhesive	With adhesive	PEI + Plus, enclosed
Nylon PA12	60–100 °C	Poor	Poor	Poor	Garolite, or PEI + Plus
CF-Nylon	80–110 °C	Poor	Poor	Poor	Garolite, or PEI + Plus
PP	80–100 °C	Poor	Poor	Poor	PP sheet or packing tape
PVA	45–60 °C	Good	Good	With adhesive	PEI + Standard

The argument people actually have

Textured or Smooth PEI?

They fail in opposite directions, which is the useful way to choose. Textured PEI holds mechanically, so it is strongest with materials that flow into the texture while they are soft — PLA, PET-G, TPU — and weakest with stiff hot polymers that bridge across it, which is why ABS lifts off textured sheets that hold PLA perfectly. Smooth PEI holds chemically and therefore holds nearly everything, including things you would rather it held less enthusiastically.

The practical answer for a machine that prints several materials is a textured sheet for everyday PLA and PET-G, and a smooth sheet plus a hot-plate adhesive for ABS, ASA, PC and Nylon. If you only want one, take smooth PEI and a bottle of adhesive: it covers more of the matrix, and the adhesive is also what protects it from PET-G.

Neither is a substitute for a flat plate. A warped sheet on a warped bed fails at the same corner regardless of what it is coated with.

Make it last

How Build Surfaces Actually Die

Scrapers

The commonest killer. A metal scraper against a warm plate takes a sliver of PEI with the part. Wait for the plate to cool, use a flex plate if you have one, and keep the scraper for the plate you have already given up on.

PET-G fusion

The second commonest. Bare smooth PEI plus PET-G plus a hot bed equals a crater. Keep the bed at 70–75 °C and always put a release layer down. This one is entirely preventable and entirely irreversible.

Nozzle digs

A Z-offset set too low ploughs a groove, and on BuildTak-type sheets the groove is permanent. Re-check the offset after changing a nozzle, a plate or the springs — not before every print, but definitely after those three.

Polish and contamination

PEI loses grip over hundreds of hours as oils build a film that IPA smears rather than removes. Warm water and dish soap restores it. A light scuff with a fine abrasive pad brings a smooth sheet back; do not sand a textured one.

Thermal cycling

Adhesive-backed films creep and bubble after enough hot-cold cycles, especially at the edges where they are lifted by scrapers. Once a bubble forms, that region prints thin forever. Solid sheets and spring steel do not have this failure mode.

What actually extends it

Let the plate cool. Use a flex plate. Put a film between the plate and anything aggressive. Clean with soap and water, not only alcohol. Handle it by the edges. None of that is expensive and all of it is what a print farm does.

Whatever the surface, the film goes between.In stock · ships across India with tracking · GST invoice · 50+ prints a bottle · leaks or arrives damaged, we replace it

Add Standard to cart₹1,199 · PLA, PET-G, TPU Add Plus to cart₹1,899 · ABS, PC, Nylon

Surfaces, answered

Questions About Build Plates

Is textured or smooth PEI better?

They fail in opposite directions. Textured PEI holds mechanically and is excellent for PLA, PET-G and TPU, but gives stiff hot materials like ABS and PC too little to key into. Smooth PEI holds chemically and therefore holds nearly everything — including PET-G, which bonds hard enough to tear chips out of the sheet unless you use a release layer. For one plate covering many materials, smooth PEI plus an adhesive covers more of the matrix.

What build surface is best for ABS?

Smooth PEI or Kapton with a hot-plate adhesive, on a bed at 95–110 °C, inside an enclosure. Textured PEI is a poor choice for ABS: the polymer is too stiff at the plate temperature to flow into the texture, so there is very little mechanical key and the corners lift as the part shrinks.

What surface does Nylon stick to?

Garolite G10, which is the plate Fracktal publishes as recommended for both PA12 and CF-PA. Nylon bonds to it in a way it does not to PEI, glass or PTFE tapes. If you do not want a dedicated plate, PEI with a hot-plate adhesive layer is the working alternative — and either way the filament has to be dried at 80 °C for eight hours first.

Can I still use a glass bed?

Yes, and for flatness it is still one of the best surfaces available. It holds nothing on its own, so every material needs an adhesive layer — which makes it predictable rather than bad. It is heavy, slow to heat, and it can shatter if you pry at a cold part, so let it cool and let the part release.

How do I clean a PEI sheet that has stopped gripping?

Warm water and dish soap, then rinse and dry, handling it by the edges. Isopropyl alcohol works for a while and then starts to smear the polymer film rather than remove it, which is why a sheet that ‘suddenly stopped working’ usually recovers completely after a wash. A light scuff with a fine abrasive pad restores a smooth sheet; never sand a textured one.

Are flexible spring-steel plates worth it?

For surface life, yes. The coating on a flex plate is the same PEI or PEX as on a fixed sheet, so adhesion is unchanged — what changes is removal. Flexing the plate releases the part with no scraper anywhere near the surface, and scrapers are the commonest cause of build-surface damage by a wide margin.

Machines Built Around the Plate

Fracktal designs and manufactures FDM printers in Bengaluru, with heated beds that hold their temperature for the length of an engineering print.

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