What supports do and why you add them in Bambu Studio

Supports are temporary structures that hold up parts of your 3D print while it's being made. When your printer deposits plastic layer by layer, it can only build on something solid beneath it. If a part of your design hangs in the air — an overhang, a bridge, or a thin wall — the plastic has nothing to stick to and will sag or fail. Supports solve this by creating a scaffold underneath those floating sections. After printing finishes, you remove the supports by hand.

Bambu Studio is the slicing software that comes with Bambu Lab printers. It shows you where supports are needed, lets you add them automatically or by hand, and controls how they're built so they're strong enough to work but straightforward enough to remove.

Not every print needs supports. Flat prints, straightforward boxes, and designs where everything slopes gently downward at less than 45 degrees usually print fine without them. But any time you see an overhang, a bridge between two points, or a thin wall that sticks out sideways, supports make the difference between a successful print and a failed one.

Key Takeaways

  • Bambu Studio's automatic support detection finds most overhangs, but you can add or remove supports by hand if the software misses something or suggests too many.
  • The support angle threshold — usually set to 45 degrees — controls which parts of your model get supports; steeper angles don't need them.
  • Tree supports use less material and are easier to remove than linear supports, and Bambu Studio uses them by default.
  • You can paint supports onto specific areas of your model or paint them away from areas where you don't want them, giving you fine control before printing.
  • Support density and wall thickness affect how much material is used and how hard supports are to remove; lower density means faster printing but weaker support.

Turning on automatic support detection

When you open a model in Bambu Studio, the software does not automatically add supports. You have to tell it to. The fastest way is to let Bambu Studio find the overhangs for you.

Click the Supports tab on the left side of the screen. You'll see a button labeled Generate Supports or Auto Generate depending on your version. Click it. Bambu Studio scans your entire model and adds supports wherever it detects an overhang steeper than the angle threshold — usually 45 degrees by default.

The software shows supports as thin tree-like structures in blue or purple on your model preview. These are not part of your final print; they're removed after printing. If the automatic detection looks right — supports under all the overhangs, none in places that don't need them — you're done with this step and can move to printing.

Adjusting the support angle threshold

The support angle threshold is the steepness at which Bambu Studio decides a surface needs support. The default is usually 45 degrees. Any surface that slopes down at a steeper angle than this gets supports; anything shallower does not.

If you want more supports — because you're printing a delicate model or using a material that's hard to print — lower the angle threshold to 40 or 35 degrees. Bambu Studio will then add supports to shallower overhangs. If you want fewer supports to save material and printing time, raise the threshold to 50 or 55 degrees. Only steep overhangs will get supports.

To change this setting, look in the Support section of the right panel. You'll see a field for Support Angle or Overhang Angle. Type in the angle you want and regenerate supports. The preview updates to show which parts now have supports under the new threshold.

Adding supports by hand with the paint tool

Sometimes automatic detection misses a spot, or you want supports in a place the software didn't suggest. Bambu Studio lets you paint supports directly onto your model.

In the Supports tab, click the Paint Support tool (it looks like a brush). Your cursor changes to a circle. Move it over the area where you want to add support and click or drag to paint. As you paint, Bambu Studio adds support structures beneath that area. You can adjust the brush size with the slider so you're not adding supports to a larger area than you need.

If you paint supports and then decide you don't want them there, use the Erase Support tool (also in the Supports tab) to remove them. Paint over the supports you want gone and they disappear from the preview.

Choosing between tree and linear supports

Tree supports branch out like a real tree, connecting to your model at multiple points. They use less material, print faster, and are easier to remove because they break away cleanly. Bambu Studio uses tree supports by default, and for most prints this is the right choice.

Linear supports are straight columns that go from the build plate up to the overhang. They use more material and take longer to print, but they're stronger and more stable for very tall or very delicate overhangs. If your model has a long thin bridge or a very fragile feature, linear supports might hold it up better.

To switch between them, open the Support settings panel on the right. Look for Support Type and choose either Tree or Linear. Regenerate supports to see the change. Most users stick with tree supports unless they run into a print failure that linear supports would prevent.

Adjusting support density and wall thickness

Support density controls how many support lines are printed inside the support structure. Higher density means more plastic and stronger supports, but they're harder to remove. Lower density uses less material and removes more easily, but weak supports can collapse during printing.

The default density works for most prints. If your supports are failing — collapsing or not holding the model up — increase the density. If your supports are hard to remove or leaving deep marks on your model, lower the density.

Wall thickness is how thick the outer shell of the support is. Thicker walls make supports stronger but harder to remove. You usually don't need to change this unless you're printing at a very high temperature or with a material that doesn't stick well to supports.

Both settings are in the Support panel on the right side. Adjust them and regenerate supports to see the effect on your preview.

Removing supports after printing

After your print finishes and cools, the supports are still attached. You remove them by hand. Tree supports usually snap off cleanly if you bend them sideways. Linear supports may need pliers or a support removal tool to break them away from the model.

Start at the base where the support meets the build plate and work your way up. Bend or twist the support gently until it breaks. If it's stuck, wiggle it back and forth rather than pulling straight up — this is less likely to damage your model. Some people use a small screwdriver or a flat tool to pry supports away from delicate areas.

After all supports are off, you may see small bumps or marks where they were attached. These can be sanded smooth or left as-is depending on what your print is for.

Frequently Asked Questions

Do I need supports for every print?

No. Prints with no overhangs — like straightforward boxes, flat objects, or designs where everything slopes gently downward — print fine without supports. Use automatic detection to see if your model needs them. If Bambu Studio suggests no supports, you probably don't need any.

What if automatic supports don't look right?

Use the paint tool to add supports where they're missing or the erase tool to remove ones you don't want. You can also adjust the support angle threshold and regenerate. If supports are still wrong after that, check that your model itself is solid and has no holes or flipped faces that confuse the software.

How do I know if my support density is too low?

If your print fails and the overhang sags or collapses, your supports were too weak. Increase the density setting and print again. If supports remove easily and your model looks clean, your density is fine.

Can I print without removing supports?

Not practically. Supports are designed to be removed. Leaving them on makes your print look unfinished and wastes material. The only exception is if you're printing a part that will be hidden inside something else, but even then, supports usually need to come off.

What's the difference between support angle and overhang angle?

They're the same thing — different versions of Bambu Studio use different names. It's the steepness at which Bambu Studio decides a surface needs support. A 45-degree angle is the default; anything steeper gets supports, anything shallower does not.