Build surfaces compared: PEI, glass and textured plates

The build surface decides whether a print sticks, whether it comes off afterwards, and what the bottom looks like. Modern spring-steel sheets with a PEI coating have largely won, and for good reason — but which coating matters.

Smooth PEI

Excellent grip on PLA, and it leaves a glossy, almost mirror-smooth bottom surface that looks superb on flat parts. The catch is PETG, which bonds to smooth PEI so enthusiastically that it can tear chunks out of the sheet when removed. Use a glue stick as a release layer for PETG, or keep a different plate for it.

Textured PEI

The powder-coated sheets. Grip comes from mechanical key rather than pure adhesion, which makes release far more forgiving — parts pop off as the plate cools with little drama, and PETG behaves itself. The bottom surface gets a pleasant matte, slightly stippled finish, which most people prefer on functional parts and some dislike on flat display pieces.

If you are buying one plate and you print a mix of materials, this is the one.

Glass

The traditional answer. Dead flat, which genuinely helps on printers with a warped bed, and it produces a very glossy bottom. It needs adhesive for most filaments, it is heavy enough to matter on a bed-slinger at speed, and it can shatter. Largely superseded, but still the right call if your bed has a dip that mesh levelling struggles with.

Other coatings

• Garolite / G10 — the specialist choice for nylon, which struggles to stick to anything else.
• Carbon-fibre-look and “high-temperature” sheets — typically PEI variants aimed at ABS and ASA.
• Adhesive-backed sheets — cheap, and fine, but replacing them is fiddlier than swapping a magnetic sheet.

When the surface is genuinely worn out

PEI loses grip with age and use. The signs are prints lifting at corners on settings that used to work, and a surface that looks glazed or shiny in the areas you print on most. A wash with warm water and detergent restores a surprising amount — it is usually grease, not wear. If a proper clean does not fix it, the sheet is done.

Gouges never recover. This is the argument for a plastic scraper rather than a metal one — see print removal tools.

Two practical notes

First, Z offset is per-plate. Sheets differ in thickness, and swapping without re-checking gives you a first layer that is suddenly wrong. See first layer calibration.

Second, buy the size for your machine. Build plates are not standard and a sheet that overhangs the magnet is worse than useless.

Questions people ask

What is the best build plate for a 3D printer?

A textured PEI spring-steel sheet is the best all-round build plate for most people. It grips mechanically, releases parts easily as it cools, and works well with PETG as well as PLA. Choose smooth PEI instead if you want a glossy, mirror-like bottom surface on flat PLA parts.

What is the difference between smooth and textured PEI?

Smooth PEI grips PLA very well and leaves a glossy bottom surface, but PETG can bond to it strongly enough to damage the sheet. Textured PEI is powder-coated, grips mechanically, releases parts more easily and leaves a matte, slightly stippled finish. Textured PEI is the more forgiving choice across mixed materials.

Is a glass bed better than PEI?

A glass bed is not better than PEI for most printers. Glass is perfectly flat, which helps on a printer with a warped bed, and gives a very glossy bottom, but it needs adhesive for most filaments, adds weight and can shatter. PEI on spring steel grips without adhesive and flexes to release prints.

How do I know when a PEI sheet needs replacing?

A PEI sheet needs replacing when prints lift at the corners on settings that used to work and a thorough wash with warm water and detergent does not restore grip. Wash it first, because lost grip is usually grease rather than wear. Gouges and scratches do not recover.

Can I print PETG on smooth PEI?

You can print PETG on smooth PEI, but use a glue stick as a release layer. PETG bonds to smooth PEI so strongly that removing the part can tear pieces out of the sheet. A textured PEI plate is a better surface for PETG and needs no release agent.

What build surface do I need for nylon?

Garolite, also sold as G10, is the usual build surface for nylon, which struggles to stick to most other surfaces. For ABS and ASA, high-temperature PEI variants are common. PLA and PETG print well on standard smooth or textured PEI.

Do I need to recalibrate when I change build plates?

Yes. Build plates differ in thickness, so the Z offset that suits one will be wrong for another. Re-check the first layer whenever you swap plates, for example between a smooth and a textured PEI sheet, or the first layer may suddenly print too high or too low.