Build plate: the surface where a part is born
The build plate is the flat surface of a 3D printer onto which the first layer is printed and from which the finished part is removed once it has cooled. Its surface affects adhesion and the look of the part's underside.
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Contents
What the plate does
In FDM printing the whole part is built upwards from the plate. The first layer has to stick firmly, or the part comes loose and curls during printing (warping). The plate also has to be flat, because its flatness decides how flat the underside of the part is.
It is usually a flexible sheet with a surface coating that is taken out of the printer after printing and flexed slightly, which makes the part release easily. The plate is normally heated so that the plastic sticks better.
Types of surface
- Smooth PEI. The underside of the part is smooth and glossy.
- Textured PEI. The underside is finely grainy and matt, the plastic holds very well and the part often releases by itself as it cools.
- Glass. Very flat and glossy, but it needs glue to make the plastic stick.
- Adhesive sheet or glue. An older method, less common today.
What this means for your model
The underside of a part takes on the texture of the plate, so it is usually not as smooth as the top. If you need a clean underside, rotate the model so that the most important face points up, or mention it in the message with your order. Model orientation decides a lot about the result too.
Size is limited by the build volume: a single part can be at most 246 × 246 × 256 mm. Parts are laid out on the plate as they fit, and the price per part and the lead time come from that (full bed).
Plate size and how parts are laid out
If you order several parts, they are laid out side by side on the plate and printed at the same time. A gap has to be left between parts and the edge of the plate cannot be used completely, so the number of parts per plate is nowhere near as simple as dividing one area by another. The exact number is worked out by the slicer when it prepares the print.
This is one of the reasons the price per part falls with larger quantities: the shared part of the print, such as heating up and the first layer, is spread over more parts. With a larger, elongated part it can pay to rotate it so that more parts fit (full bed).
Common questions
What surface will the underside of the part have?
An imprint of the plate surface. With smooth PEI it is glossy, with textured PEI finely grainy. You can only influence it by rotating the model.
How large a part fits on the plate?
At most 246 × 246 × 256 mm with us. A larger model can be split into several parts.
Why do some parts come loose?
That is warping, the plastic shrinking as it cools. A wider contact area with the plate and a suitable orientation help.
Related terms
PEI build plate
A PEI build plate is a flexible steel sheet with a polyetherimide surface that filament sticks to well when warm, and the part releases once it has cooled. It is the most common build surface today.
Heated bed
A heated bed is a build plate with built-in heating that keeps the bottom layers of a part warm. The plastic sticks better and cools more slowly, so the part warps less.
Poor first-layer adhesion
Poor first-layer adhesion is when the first layer of plastic does not stick well enough to the build plate, so the part comes loose or shifts during printing, or only a clump of plastic forms.
First layer
The first layer is the first layer of plastic that the nozzle lays on the build plate. If it does not stick, the whole print fails.
Build volume
Build volume is the largest block that fits in a 3D printer, set by the size of the plate and the height of the Z axis. With us a single part can be at most 246 × 246 × 256 mm.
Bed leveling
Bed leveling is measuring or adjusting the distance between the nozzle and the build plate across the whole surface. It means the first layer has the same height everywhere and the part sticks.
SourcesSources checked 1 November 2026, 2
- Fused filament fabrication, Wikipedia, checked 2026-11-01
- Polyetherimide, Wikipedia, checked 2026-11-01
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No model? No problem, pick a ready one
These sites have thousands of free models. Download an STL or 3MF and upload it here. If you sell it or use it for business, check the model licence. How to pick a model and licence