How and When Should You Use a Brim in 3D Printing?

A brim is a simple yet effective solution that adds extra surface contact to help prints stick firmly to the build plate. Knowing when to use a brim and when it’s unnecessary can significantly improve print success without changing the actual model. This guide explains how a brim works and the situations where it makes the biggest difference.

What Is a Brim in 3D Printing?

A 3D printing brim is a slicer-generated first-layer adhesion feature that adds multiple connected perimeter lines around the outer edge of a model’s base. These lines extend outward from the part’s footprint, increasing the effective contact area with the build plate and improving first-layer stability.

Key characteristics of a brim:

• Prints at the same layer height as the first layer
• Extends outward from the model’s edges, not underneath
• Surrounds the part while staying connected to the outer perimeter
• Easier to remove than rafts and less material-intensive

Unlike rafts, brims do not interfere with the bottom surface of the model, making them ideal when surface quality matters.

What Does a Brim Do in 3D Printing?

A brim improves print reliability by increasing first-layer surface contact and stabilizing the model during the initial stages of printing. By anchoring the outer edges of the part to the build plate, a brim helps counteract edge lift, thermal contraction, and uneven stress distribution that can occur as material cools.

Understanding how a brim influences first-layer behavior and part stability makes it easier to determine when its use is necessary and when it can be avoided.

Increases Bed Contact Area

One of the main functions of a brim is to increase the effective first-layer surface area in contact with the build plate. By adding multiple connected extrusion lines around the base of a model, the brim distributes forces more evenly and strengthens the mechanical grip of the part to the bed. This additional contact reduces edge lift and warping during the initial layers, especially in models with sharp corners, small footprints, or narrow bases.

Reduces Warping and Edge Lift

Warping is a common issue in FDM 3D printing that occurs when a filament cools unevenly, causing the edges of a part to contract toward the center. A brim mitigates this problem by anchoring the perimeter of the model to the build plate, improving first-layer adhesion and stabilizing the part during the initial layers. This is particularly important for high-shrinkage filaments such as ABS, Nylon, and PETG, which are more prone to dimensional distortion compared to PLA. By maintaining firm contact with the build plate, the brim helps preserve accurate dimensions, prevent edge lift, and produce cleaner, more precise 3D printed parts.

Improves Stability for Small or Narrow Bases

Models with limited build plate contact, such as thin pillars, delicate legs, or detailed figurines, are prone to shifting, detachment, or print failure during FDM 3D printing. A brim enhances structural stability by reinforcing the base area and increasing first-layer adhesion, without altering the original 3D model geometry. This added support is particularly valuable for tall prints or narrow-footprint parts, where even minor movements can lead to visible defects, dimensional inaccuracies, or complete print failure.

Supports Consistent Extrusion at the Start of Printing

A brim also functions as a controlled warm-up for the extruder and nozzle in FDM 3D printing. Printing the brim allows filament flow to stabilize and reach a uniform rate before the printer begins the actual model. This pre-print stabilization reduces under-extrusion, gaps, and inconsistent first-layer lines, improving overall first-layer quality and ensuring a cleaner, more reliable start for the print. By helping the hotend reach optimal temperature and the filament to flow consistently, a brim contributes to more precise and accurate 3D printed parts.

Helps Fine-Tune First-Layer Settings

A brim provides a clear and continuous reference around the model, making it an effective tool for evaluating first-layer settings in FDM 3D printing. By observing the brim, users can assess nozzle height, extrusion width, layer adhesion, and filament flow. Uneven thickness, gaps, or poor adhesion along the brim indicate calibration issues with the build plate or slicer settings, allowing adjustments before printing critical or complex parts. Using a brim in this way improves print reliability and ensures a more consistent first layer for the main model.

Brim vs Raft in 3D Printing: What’s the Real Difference?

Both brims and rafts are designed to improve print stability and first-layer adhesion in FDM 3D printing, but they function differently and are suited to distinct printing scenarios. Choosing the right option can minimize material waste, reduce post-processing effort, and maintain dimensional accuracy. The table below highlights the key differences:

Feature	Brim	Raft
Placement relative to model	Around the model’s perimeter	Fully underneath the model
Material usage	Low	High
Print time impact	Minimal	Significant
Bottom surface finish	Mostly unaffected	Often rough or uneven
Ease of removal	Relatively easy	More difficult
Recommended use cases	Small bases, tall prints, minor adhesion issues	Severe warping, uneven or damaged build plates
Dimensional accuracy	High	Can reduce dimensional accuracy

When Should You Use a Brim?

Brims are not mandatory for every 3D print, but they are extremely useful in situations where first-layer adhesion, print stability, or dimensional accuracy is at risk. Understanding these scenarios ensures more reliable prints and reduces material waste or post-processing effort.

1. Small or Limited Bed Contact

Models with narrow bases, thin legs, point-contact footprints, or delicate features such as figurines, mechanical parts, or fine architectural details are prone to shifting or detaching during printing. A brim increases the effective build plate contact area, providing mechanical stability and reducing the risk of print failure.

2. Tall and Slender Models

Tall prints with minimal base area are susceptible to wobbling or tipping during the early layers. A brim widens the foundation of the part, enhancing structural stability and reducing movement caused by nozzle pressure or filament cooling.

3. Warp-Sensitive Filaments

Brims are highly recommended for filaments with significant thermal contraction, including ABS, PETG, Nylon, and Polypropylene. Even PLA may require a brim for large flat surfaces, sharp corners, or long prints, where edge lifting or warping could occur.

4. Overhangs and Fine Details

When printing parts with overhangs, thin edges, or intricate base details, a brim helps anchor these areas to the build plate. This prevents warping, curling, or distortion at the base of delicate features.

5. Multiple Parts on the Build Plate

Printing multiple small objects simultaneously increases the risk of shifting or detachment. Using a brim for each part ensures consistent adhesion, maintaining proper spacing and reducing the chance of collisions or misalignment.

6. Unreliable Print Surfaces

Brims compensate for reduced adhesion on surfaces such as smooth glass beds, worn PEI sheets, unheated plates, or magnetic build surfaces. By reinforcing the perimeter, the brim improves first-layer bonding, making prints more reliable.

7. Environmental Instability

Printing in cold rooms, near airflow drafts, or in areas with fluctuating temperatures can weaken adhesion. A brim adds insurance against environmental variables, keeping the part anchored during the critical first layers.

8. Fine-Tuning First-Layer Settings

A brim also acts as a visible guide to evaluate nozzle height, extrusion flow, and first-layer thickness. Uneven extrusion or gaps along the brim indicate calibration issues, allowing adjustments before printing critical or complex parts.

9. Custom Brim Width or Layer Considerations

Depending on the print size, material, and model geometry, adjusting the brim width, number of perimeter lines, or layer height can optimize adhesion. Wider brims are recommended for large or tall prints, while smaller brims suffice for narrow bases or minor adhesion problems.

When Should You Avoid Using a Brim? (Expert Opinion)

While brims are highly effective for improving first-layer adhesion and print stability, unnecessary use can increase material waste, cleanup effort, and post-processing time. Understanding when a brim is not required ensures optimal print quality and efficiency.

1. Large, Flat-Bottomed Prints

Models with wide, flat bases — such as boxes, trays, or mounts — typically adhere well to the build plate without additional support. Using a brim in these cases offers minimal benefit because the contact area is already sufficient to prevent edge lift or warping. Adding a brim here can unnecessarily increase filament usage and extend print time, while offering no improvement in first-layer bonding.

2. Critical Bottom Surface Finish

If the bottom of the print must remain perfectly flush, smooth, or visible, a brim may leave marks, lines, or rough edges along the perimeter. This can compromise dimensional accuracy or require additional post-processing such as sanding or trimming. For parts with precise mating surfaces or aesthetic requirements, it is better to rely on skirt lines or optimized build plate adhesion techniques.

3. Intricate Base-Edge Features

Prints with fine textures, embossed details, or intricate edges at the base may fuse with the brim. Removing the brim in these cases risks damaging delicate features or distorting dimensional accuracy. Alternative strategies, such as improving build plate leveling, surface preparation, or using a skirt, are safer for preserving base-edge details.

4. High Material or Time Constraints

When minimizing filament consumption or print duration is important, a brim may be unnecessary. Each additional perimeter line consumes material and adds print time, which can be significant for large models or batch prints. Optimizing first-layer adhesion through bed leveling, surface adhesion aids, or correct nozzle height can eliminate the need for a brim in these cases.

5. Already Using Rafts or Skirts

If a raft is already used to provide adhesion and compensate for an uneven or warped build plate, adding a brim may be redundant. Similarly, a properly configured skirt can prime the extruder and improve filament flow without affecting the part perimeter. Using multiple adhesion aids unnecessarily increases cleanup effort and can make post-processing more difficult.

6. Flexible or Soft Filaments

Materials like TPU, flexible PETG, or soft filaments can adhere too strongly to a brim, making removal difficult and risking damage to the part’s base. For these filaments, it is often better to adjust first-layer settings, use low adhesion build surfaces, or rely on skirts to prevent edge lift without compromising removal.

7. Extremely Small Prints

Very small parts with tiny footprints may not benefit meaningfully from a brim. While a brim can technically increase adhesion, it may be disproportionate to the size of the part, increasing cleanup work and risking damage during removal. In such cases, fine-tuning first-layer settings and using a heated bed or adhesive aid (glue stick, PEI sheet, etc.) is usually sufficient.

How to Add a Brim in Creality Slicer

Creality Slicer (Creality Print) allows easy control over brim settings.

Basic steps:

1. Load your model into Creality Print
2. Open Build Plate Adhesion or Others
3. Enable Brim
4. Adjust:
   
   • Brim width
   • Line count
   • Brim gap (if available)
5. Re-slice and start printing

Fine-tuning these values ensures strong adhesion without excessive cleanup.

How to Achieve a Clean and Effective Brim?

If your brim fails or becomes difficult to remove, small adjustments usually fix the issue.

Optimize Brim Settings

• Use moderate width, enough for adhesion, not excess
• Increase line count only if adhesion problems persist
• Enable smart or offset brim options when available

Level the Bed Precisely

Poor bed leveling leads to uneven brim lines and weak adhesion. Re-level regularly, especially after hardware changes.

Match Brim Strategy to Filament

• ABS & Nylon: Wider brims, more lines
• PETG: Moderate brim with controlled temperature
• PLA: Minimal brim or none in most cases

Control Bed and Nozzle Temperature

• Excessive heat can cause brims to fuse too strongly
• Low temperatures weaken adhesion
• Follow filament-specific temperature recommendations

Common Brim Problems and How to Fix Them

Although brims are simple to apply, incorrect settings or poor calibration can lead to common issues. Understanding these problems and their causes makes it easier to achieve clean, reliable results.

Brim Sticks Too Strongly to the Model

When a brim bonds excessively to the model, it usually indicates that the first layer is being printed too close to the build plate or with too much material flow. Very low layer heights and high bed temperatures can also contribute to this issue. Increasing the first-layer height slightly, reducing extrusion flow for the initial layer, or adjusting the brim offset can make removal easier without sacrificing adhesion.

Brim Is Difficult to Remove Cleanly

Hard-to-remove brims often result in rough edges along the model base. This typically happens when the brim width or line count is too high. Allowing the print to cool completely before removal helps the plastic release more naturally. Reducing bed temperature after the first few layers and slightly lowering brim density can also improve removal without compromising stability.

Brim Lifts or Peels During Printing

If the brim itself detaches from the bed, the underlying issue is usually poor bed preparation or uneven surface leveling. Dust, grease, or residue on the build plate significantly reduces adhesion. Cleaning the bed thoroughly and recalibrating the leveling system often resolves the problem. In colder environments, a small increase in bed temperature can also help maintain consistent adhesion.

Uneven Brim Lines or Gaps

Uneven brim lines are a strong indicator of bed leveling issues or incorrect nozzle height. When some areas of the brim appear thin while others are overly flattened, the nozzle is either too close or too far from the bed in certain regions. Re-leveling the bed and adjusting Z-offset ensures uniform extrusion and consistent line width around the entire model.

Brim Causes Edge Deformation at the Base

Sometimes the heat retained in a wide brim causes the lower edges of a model to bulge outward, a phenomenon commonly known as elephant’s foot. This occurs when heat spreads from the brim into the model base and softens the material excessively. Slightly raising the nozzle offset, reducing first-layer flow, or using slicer-based elephant foot compensation helps preserve sharp and accurate edges.

Brim Does Not Appear in the Slicer

If a brim fails to generate in the slicing preview, the issue typically lies in incorrect adhesion settings. Ensuring that build plate adhesion is set to brim and that the brim width or line count is greater than zero resolves this problem. Re-slicing the model or restoring default adhesion settings can also correct configuration conflicts.

Final Thoughts

A brim is one of the most practical tools in 3D printing for improving first-layer reliability. It strengthens adhesion, prevents warping, and supports challenging geometries all without altering the actual part design.

When used thoughtfully and configured correctly, brims can dramatically increase print success while saving time, material, and frustration.