Bambu Studio’s New Color Mixing Feature: Get Dozens of Colours From Just a Few Filaments 🌈

You know those rainbow Benchies we posted on our socials? Yeah, those weren’t printed with a dozen different filaments. They were printed with just four.

Bambu Studio v2.5.3 just dropped what might be the most exciting slicer feature of 2026 — Color Mixing (the community’s been calling it “Full Spectrum Printing”). It lets you mix two or three filaments together to create entirely new colours, all automatically calculated by the slicer. Think of it like how your inkjet printer makes every colour from just cyan, magenta, yellow, and black cartridges — except now your 3D printer can do the same thing.

If you own any Bambu Lab printer with an AMS, you can start experimenting with this today. Here’s everything you need to know — how it works, what you need, and whether it actually lives up to the hype.

What Is Color Mixing in Bambu Studio?

Color Mixing is a new feature introduced in Bambu Studio version 2.5.3. It allows you to combine two or three filaments of the same material type to produce new colours — without buying additional spools. The slicer does all the heavy lifting: you pick your base colours, adjust the ratio, and Bambu Studio slices the model so thin alternating layers of each colour create the optical illusion of a blended colour.

This isn’t the same as traditional multicolour printing where different parts of a model are printed in different colours. With Color Mixing, a single surface appears as a completely new colour that isn’t any of your loaded filaments. Red and white become pink. Blue and yellow become green. Load the Bambu Lab CMYK kit (Cyan, Magenta, Yellow, and Jade White) and you can produce dozens of distinct hues from just four spools.

The feature builds on something the open-source community has been experimenting with for a while. A project called FullSpectrum — a fork of OrcaSlicer by developer Ratdoux — demonstrated the concept for the Snapmaker U1 toolchanger. Bambu Lab has now brought a polished, production-ready version of this technique directly into their official slicer, complete with a proper UI, recommended colour palettes, and gradient mode.

Key Features at a Glance

How Colour Mixing Actually Works

Let’s clear up a common misconception first: the printer does not physically blend filaments inside the nozzle like mixing paint. Instead, Bambu Studio uses a clever technique called optical layer alternation.

Here’s the idea. When you print at very thin layer heights (around 0.12mm), most PLA filaments are slightly translucent — you can see a tiny bit through each layer. The slicer exploits this by printing alternating layers of different colours in a specific ratio. Your eyes blend those thin stacked layers together, and you perceive a single mixed colour. Red layer, white layer, red layer, white layer — your brain sees pink.

It’s the same principle behind CMYK printing in the 2D world, where tiny dots of cyan, magenta, yellow, and black create every colour in a magazine. Bambu Lab even sells a PLA CMYK Lithophane Bundle (Cyan, Magenta, Yellow, and Jade White) that’s specifically designed for this — load those four spools and you can theoretically produce dozens of distinguishable colour combinations from a single plate.

Two Modes: Normal Mixing and Gradient Transitions

Bambu Studio v2.5.3 gives you two distinct colour mixing modes, both accessible through a simple “Add Mixed Filament” button at the bottom of the filament list.

Normal Mode

This is the straightforward one. You select two or three filaments of the same material type (all PLA, or all PETG — you can’t mix PLA with PETG) and adjust the mixing ratio using an intuitive interface. For two-colour mixes, you get a colour bar slider — drag it toward one colour or the other. For three-colour mixes, you get a colour triangle where you can tap any point to set the ratio between all three.

Below the ratio panel, Bambu Studio also shows a grid of recommended colours — pre-calculated combinations that tend to look great. This is super helpful if you don’t want to fiddle with exact ratios. Just pick the colour you like, and the slicer handles the rest.

Each “mixed filament” you create appears in your filament list as a new virtual colour that you can assign to any part of your model, just like a regular filament. You can create multiple mixed filaments and use them alongside your base colours in the same print.

Gradient Mode

This one’s where things get really fun. Gradient Mode creates smooth colour transitions between two colours across the height of your print. Imagine a vase that gradually shifts from deep blue at the bottom to white at the top, with every shade of light blue in between. That’s Gradient Mode.

The effect is gorgeous on tall models — vases, figures, decorative pieces — and it’s something that was previously only achievable with specialty gradient filament spools. Now you can create any gradient combination you want from the filaments you already own.

Recommended Settings for Best Colour Blending

Bambu Lab’s official recommendations for colour mixing are specific, and for good reason — the layer height directly determines how well colours blend visually.

Community testing on MakerWorld confirms that 0.08–0.12mm layer heights produce the cleanest blending, especially with semi-translucent filaments. At the standard 0.2mm, you’ll see visible colour striping with opaque filaments — it still works, but the illusion is less convincing.

One important caveat from the release notes: avoid extreme layer height ratios, as excessively small layer heights may trigger melt fracture. Basically, don’t go too thin or you’ll get rough surfaces. And Bambu Lab acknowledges that the colour preview in the slicer isn’t perfectly accurate yet — always print a small test piece first if colour accuracy matters for your project.

The CMYK Filament Kit: Your Four-Colour Universe

If you want to maximise the number of achievable colours, Bambu Lab’s PLA CMYK Lithophane Bundle is the move. It includes Cyan, Magenta, Yellow, and Jade White (which functions as the “paper” backing that CMYK printing normally relies on).

With these four colours loaded in your AMS, the colour mixing feature can generate an enormous palette. The official demo shows dozens of distinct colours produced from just this CMYK combination. Add black to the mix and you extend into darker tones — though as some community members have pointed out, black filament’s low translucency means it doesn’t blend as smoothly as the other CMYK colours.

The general rule: semi-translucent filaments blend better than fully opaque ones. Bambu Lab’s PLA Translucent line (available at Smith3D from RM72/kg) is worth considering if you plan to do a lot of colour mixing work.

Bambu Studio vs Other Slicers: Colour Mixing Comparison

Here’s the thing that makes Bambu Studio’s Color Mixing feature notable: no other major slicer has anything like it. PrusaSlicer, UltiMaker Cura, and IdeaMaker all support multicolour printing in the traditional sense — assigning different filaments to different parts of a model, or inserting filament change commands at specific layers. But none of them offer automatic colour generation from base filaments through ratio-based mixing.

The one notable exception is FullSpectrum, a community fork of OrcaSlicer by developer Ratdoux, which implements a similar layer-alternation approach. But it’s specifically designed for the Snapmaker U1 toolchanger, is still in early development, and has not been tested on actual hardware. Bambu Studio’s implementation is the first from a major manufacturer that’s integrated directly into a polished, mainstream slicer with a proper UI.

The Open-Source Lineage: Bambu Studio and Orca Slicer

If you’ve been in the 3D printing community for a while, you might know that Bambu Studio has an interesting family tree. The lineage goes: Slic3r → PrusaSlicer → Bambu Studio → OrcaSlicer. That’s right — OrcaSlicer (by developer SoftFever) is actually forked from Bambu Studio, not the other way around. OrcaSlicer also incorporated features from SuperSlicer and supports a much wider range of printers beyond just Bambu Lab.

Both slicers are licensed under AGPL-3.0 (open source), and there’s been ongoing community discussion about the relationship between commercial manufacturers building on open-source foundations. The FullSpectrum fork mentioned above sits further down this chain — it’s a fork of Snapmaker’s fork of OrcaSlicer.

For most users, what matters is simple: Bambu Studio is the best-supported slicer for Bambu Lab printers, with the tightest hardware integration, cloud features, and now colour mixing. OrcaSlicer is the community favourite for multi-brand printer support and advanced calibration. Both are excellent, and both are free.

Everything Else New in Bambu Studio v2.5.3

Bambu Lab X2D support — The brand-new X2D dual-nozzle printer is now fully supported. It features a direct-drive main nozzle and Bowden auxiliary nozzle, 1,000mm/s top speed, 65°C heated chamber, and up to 25-colour printing.

Five new Fuzzy Skin modes — Beyond the classic random texture, you can now choose Perlin noise, Voronoi cells, Displacement, Extrusion, and Combined patterns. Fuzzy skin is now paintable — apply it selectively to specific surfaces.

Assembly Overview Preview — See how your multi-part model looks fully assembled in real time as you adjust colours and painting.

Filament Track Switch — For H2C and X2D owners, a single filament from the AMS can now be routed to both nozzles, reducing unnecessary purging.

Individual Object Skirts — Each object on the plate can have its own skirt, helping eliminate first-layer artifacts after colour changes.

Which Bambu Lab Setup Should You Get for Colour Mixing?

Here’s our honest take on which setups make sense for colour mixing, based on hardware and pricing at our KL showroom:

Budget-friendly entry: Bambu Lab A1 Mini Combo

Comes with AMS Lite for 4-colour printing. The most affordable way to experiment with colour mixing. Expect longer print times and more waste compared to multi-nozzle printers, but it works for learning the technique. Browse A1 Series at Smith3D →

The sweet spot: Bambu Lab A1 Combo

Larger 256×256×256mm build volume with AMS Lite. Same colour mixing capability as the A1 Mini but with more room for bigger prints. Browse A1 Series at Smith3D →

Enclosed and versatile: Bambu Lab P1S Combo

Enclosed chamber for ABS and ASA printing. The AMS 2 Pro adds built-in filament drying up to 65°C. Browse P1S at Smith3D →

Flagship: Bambu Lab X1 Carbon Combo

Micro Lidar and AI inspection for real-time print quality monitoring. 60°C heated chamber and hardened steel nozzle. Browse X1 Series at Smith3D →

Ideal for colour mixing: Bambu Lab H2 Series

From RM6,999 (H2S) to RM15,199 (H2D Pro) — Multi-nozzle setup dramatically reduces filament waste during colour changes. If colour mixing is going to be a major part of your workflow, the H2 series is what Bambu Lab designed this feature for. Browse H2 Series at Smith3D →

Recommended Accessories and Filaments

• AMS 2 Pro , built-in drying for 4 filament slots. View on Smith3D →
• Bambu Lab PLA Translucent Semi-translucent filaments produce the best colour blending results. View on Smith3D →
• Bambu Lab PLA Basic. Budget-friendly option for experimenting with colour mixing.
• PLA CMYK Lithophane Bundle. The ideal starter kit for colour mixing. Check Smith3D Bambu Lab page for availability and pricing.

Setup Checklist

1. Update Bambu Studio to v2.5.3 or later (free download from bambulab.com).
2. Load at least 2 filaments of the same material type into your AMS/AMS Lite/AMS 2 Pro.
3. Click “Add Mixed Filament” at the bottom of the filament list in Bambu Studio.
4. Select your base colours and choose Normal Mode (fixed colour) or Gradient Mode (colour transition).
5. Adjust the mixing ratio using the colour bar (2 colours) or colour triangle (3 colours).
6. Assign the mixed filament to your model or specific surfaces using the colour painting tool.
7. Set layer height to 0.12mm (base) and 0.2mm (mixed) for best results with a 0.4mm nozzle.
8. Print a small test piece first — the colour preview isn’t perfectly accurate yet.
9. Examine vertical walls — colour mixing only works properly on near-vertical surfaces.
10. Iterate and enjoy — experiment with different ratios and filament combinations!

Common Mistakes to Avoid

• Mixing different material types — you can’t mix PLA with PETG. All filaments in a mix must be the same type.
• Using fully opaque filaments — highly opaque filaments produce visible colour striping instead of smooth blending. Use semi-translucent whenever possible.
• Going too thin on layer height — below 0.08mm can trigger melt fracture, resulting in rough, grainy surfaces. Stick to the 0.10–0.12mm sweet spot.
• Expecting perfect colour accuracy from the preview — Bambu Lab says the colour preview model isn’t fully accurate yet. Always test print first.
• Applying colour mixing to sloped surfaces or top faces — the feature only works on near-vertical walls. Plan your model orientation accordingly.
• Ignoring filament waste on single-nozzle printers — each colour change means purging. Budget 20–30% extra filament for colour-mixed prints on A1/P1S/X1C. Multi-nozzle printers (H2C, X2D) dramatically reduce this waste.
• Using three-colour mixes when two would suffice — community testing consistently shows two-filament mixes produce clearer, more predictable results. Three-colour mixes tend to look muddy.

Tips From the Community (and From Us)

Start with a test piece. MakerWorld has several colour blending test models you can download for free — search for “colour blending swatch” or “optical color mixing” and you’ll find parametric test plates that let you evaluate different ratios side by side.

Two-colour mixes beat three-colour mixes. Community testing on MakerWorld and the Bambu Lab forum consistently shows that mixing two filaments produces clearer, more predictable results. Three-colour mixes tend to look muddy unless you’re very careful with the ratios.

Vertical walls are your friend. The colour mixing effect only works properly on near-vertical surfaces. Design your models accordingly — or orient them so the colour-mixed surfaces face vertically.

Semi-translucent filament is the secret weapon. The whole technique relies on light passing through thin layers. More translucent filament = better colour blending. Bambu Lab’s PLA Translucent line is excellent for this.

Budget for waste on single-nozzle printers. Each colour change means purging. On a print with frequent mixing, you might use 20–30% more filament than a single-colour print. Consider the H2 series if colour mixing is a major part of your workflow.

Keep filament dry. In Malaysian humidity, filament absorbs moisture fast — and wet filament produces inconsistent extrusion that ruins the thin-layer blending effect. Use the AMS 2 Pro’s built-in drying feature, or store your spools in a dry box with desiccant.

Should You Try Colour Mixing?

Bambu Studio’s Color Mixing feature is the real deal. It’s the first integrated colour mixing system in a major mainstream slicer, it works with hardware you may already own, and it produces results that weren’t possible in consumer FDM printing before this year.

Try it if:

• You already own a Bambu Lab printer with an AMS and want more colours without buying more spools
• You’re interested in CMYK-style full-colour 3D printing
• You print decorative items, gifts, or prototypes where custom colours add value
• You want to teach colour theory with a hands-on 3D printing project

Hold off if:

• You only print functional parts where colour doesn’t matter
• You’re on a tight filament budget and can’t afford the extra waste from purging (single-nozzle printers)
• You need precise Pantone-level colour matching — the preview accuracy isn’t there yet

If you’re already running a Bambu Lab printer with an AMS, you can try it right now for free. Just update to Bambu Studio v2.5.3, load two or three colours, and hit “Add Mixed Filament.” Start with something small — a colour swatch, a Benchy, a decorative print — and see how the colours come out.

And if you’re thinking about jumping into the Bambu Lab ecosystem, this is one more reason why it’s worth it. Come visit us at our Sungai Besi showroom in KL — we’ll show you colour mixing in action and help you pick the right setup. All our Bambu Lab printers ship from our KL warehouse with same-day delivery available via Grab/Lalamove, plus a 1-year carry-in warranty.

Happy printing!

Smith3D is an authorised Bambu Lab dealer in Kuala Lumpur, Malaysia. Visit us at smith3d.com/brand/bambu-lab to browse the full range, or drop by our showroom.

Sources

Color Mixing / Half-Tone Feature Request — GitHub Issue #3581

Bambu Studio V2.5.3 Release Note — Bambu Lab Wiki

Bambu Studio Releases — GitHub

PLA CMYK Lithophane Bundle — Bambu Lab Store

Optical Color Mixing by Layering (Bambu Lab / AMS) — MakerWorld

Color Blending Swatch — MakerWorld

OrcaSlicer-FullSpectrum — GitHub (Ratdoux)

FullSpectrum Is Like HueForge For 3D Models — Hackaday

Color Mixing Feature Discussion — Bambu Lab Community Forum