Model orientation: how to place a part on the build plate
Model orientation is the position in which a part lies on the build plate. In FDM printing it decides the strength, the surface finish, the amount of supports and the print time.
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
Contents
Why the rotation matters
In FDM a part is built from layers, and the bond between layers is weaker than the plastic inside a single layer. The effect is called anisotropy: the material does not have the same properties in every direction. A part therefore takes far more load along the layers, and the least when you try to pull the layers apart. That kind of peeling is called delamination.
A practical example: a hook printed lying flat will not snap, but the same hook printed standing up breaks right at the boundary between layers.
What orientation changes besides strength
- Supports. If you rotate a part so that it has fewer overhangs, it needs fewer supports. You save material, time and a spot that would be left marked after removal.
- Surface. Sloped and curved surfaces show visible layer steps. It is better to put an important face on the side or on top rather than on supports.
- Bottom face. The face lying on the plate is the flattest and most accurate. Mating surfaces should therefore go down.
- Time and quantity. A low, flat part prints faster and a tall one slower, and that also decides how many parts fit on one plate.
How it works with us
After you upload a model, we really do prepare it for printing on our server, so the price and the lead time come from the actual orientation, grams and time. If you send a 3MF or STL, we go by the position the model is saved in. If the direction of strength matters to you, for example for a bracket that will carry a load, tell us at jakub.novak@boostello.com before ordering. You can also rotate the model yourself in CAD or in a slicer and send it saved in the position you chose, but we only promise to print it exactly that way after we have agreed on it.
You can also increase the strength of a part with your choice in the calculator: light infill 10 %, standard 15 %, strong 40 %. Together with good orientation, that is the main thing you can do.
Quick rules that work
- Put the largest flat face down. It will be stable and accurate.
- Round holes come out roundest when their axis stands perpendicular to the plate.
- Tall thin parts can wobble during printing and snap along layers, so lay them on their side instead.
- Put lettering and logos on the top or a side face, not on a face that would sit on supports.
One orientation seldom suits everything. If strength and looks pull against each other, decide which matters more for that part.
Common questions
How should I rotate a part to make it as strong as possible?
The layers should run across the direction in which the part is loaded. A pulling force should not tear the layers apart. Long thin parts are therefore usually printed lying flat.
Does orientation change the price?
Yes. It changes the amount of supports and the print time, and so the price per part. When you upload a model you see the price for the current orientation.
Can I choose the orientation myself?
The most reliable way is to tell us before ordering how you want the part rotated. Or rotate it in your software and save it so that it comes out as you imagine.
Related terms
Supports
Supports are auxiliary columns of material that hold up the overhanging parts of a part in 3D printing. They are removed after printing, but they add material, time and marks on the surface.
Overhang
An overhang is a part of the model that sticks out over empty space with nothing underneath it. In FDM printing, only up to a certain angle can be printed without supports.
Layer delamination
Delamination is the separation of two neighbouring layers of a 3D print that did not bond well enough during printing, so the part cracks along a layer.
Layer height
Layer height is the thickness of a single layer, from which the printer builds the part from the bottom up. It affects how visible the layers are on the surface and how long printing takes.
Walls (perimeters)
Walls, technically perimeters, are the outline lines with which the nozzle draws the outer and inner contour of every layer. Together they form the shell of the part.
Infill
Infill is the sparse lattice that fills the inside of a part in 3D printing. It is given as a percentage, and the higher it is, the stronger, heavier and dearer the part.
SourcesSources checked 1 November 2026, 2
- Fused filament fabrication, Wikipedia, checked 2026-11-01
- Anisotropy, Wikipedia, checked 2026-11-01
We will print it for you
Upload a model and see the price per piece, the total with shipping and the date at once. We print in Košice, Slovakia, from PLA and PETG.
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