What Is Raft in 3D Printing: Definition and Uses

In 3D printing, a raft is a flat base layer printed underneath the actual object to improve adhesion to the build plate and prevent warping. It acts like a temporary foundation that is removed after printing to ensure the model sticks well and prints accurately.

How It Works

A raft in 3D printing is like laying down a temporary floor before building a house. It is a few layers of plastic printed first on the build plate, creating a stable and even surface. This helps the main object stick better, especially if the build plate is uneven or the material tends to warp.

Think of it as placing a protective mat under a fragile item to keep it steady. The raft separates the object from the plate, so if the plate has dust or slight bumps, the raft smooths those out. After printing, you can easily remove the raft, leaving the object intact and well-formed.

Example

Here is a simple example of how to enable a raft in a 3D printer slicer configuration using G-code comments to illustrate the concept:

gcode

; Start raft layers
M190 S60 ; Set bed temperature
M104 S200 ; Set nozzle temperature
; Raft layer 1
G1 X0 Y0 Z0.2 F1500 ; Move to start
G1 X50 Y0 E5 F1200 ; Print raft base
; Raft layer 2
G1 X0 Y50 E10 F1200 ; Continue raft
; Start main print
; Remove raft after print

Output

The printer lays down initial layers forming a raft before printing the main object, improving adhesion and print quality.

When to Use

Use a raft when printing with materials that warp easily, like ABS plastic, or when the build plate surface is not perfectly clean or level. It is helpful for objects with small footprints that might not stick well on their own.

For example, if you are printing a tall, thin model or something with a small base, a raft can prevent the print from detaching mid-way. It is also useful when printing on glass or other surfaces where adhesion is tricky.

Key Points

• A raft is a temporary base printed under the object.
• It improves adhesion and reduces warping.
• Rafts are removed after printing is complete.
• Useful for tricky materials and small base objects.

Key Takeaways

A raft creates a stable base to help prints stick to the build plate.

It prevents warping and improves print quality for difficult materials.

Rafts are printed first and removed after the main object is done.

Use rafts for small or delicate models to avoid print failures.