What is multi-material 3D printing?
In multi-material 3D printing, a 3D printer uses several different materials during the printing process. 'Traditional' 3D printing always uses just one material. Multi-material printing opens up many new possibilities. For example, hard and flexible materials can be combined. You can also create different colors and levels of transparency. Conductive or biocompatible materials can also be integrated into the printing process.
How does multi-material 3D printing work?
There are several ways to perform multi-material 3D printing, depending on the type of 3D printer. While the process varies, the general concept remains the same.
Multi-material printing via multi-extrusion
In this technique, multiple extruders are used, one for each material. During printing, the printer switches to the required extruder to deposit the correct material.
Powder Bed Fusion
With this technique, a bed of powder (usually plastic or metal) is built up layer by layer. A binding agent is then selectively applied to each layer. Once a layer is bound, excess powder is removed, and the process repeats for the next layers. You can use different binders and powders to achieve various properties and colors.
Multi-material 3D printing with SLA printers
With SLA printers, you can perform multi-material 3D printing by using special resins that are compatible with the SLA process and are cured individually by the UV laser.
The benefits of multi-material 3D printing
First, the benefits. Multi-material 3D printing gives designers more freedom to create complex objects that would otherwise be difficult or impossible to produce using traditional methods. It also saves time because a complex object can be completed in one go, reducing the need for additional assembly or post-processing.
There are also more options for customization. Multi-material 3D printing allows you to better meet the specific requirements and needs of customers—or yourself! You also produce less waste because you only use the exact amount of material needed to create the 3D print.
The drawbacks of multi-material 3D printing
It all sounds great, but unfortunately, there are some downsides. 3D printers capable of multi-material printing are generally a bit more difficult to use and more expensive than single-material printers.
You also need more expertise and experience to get the job done. Setting up and calibrating the 3D printer can be more complicated.
Another disadvantage is compatibility issues. Combining different materials can cause adhesion problems or uneven shrinkage, which affects the quality and durability of the final product. Furthermore, not every material is suitable for multi-material printing.
Everything prepped and set up for multi-material printing? Then it’s time to sit back and let the printer do its thing. You might be sitting back a bit longer than expected, though, as multi-material printing does increase the total print time.
So, what are some good combinations?
When it comes to multi-material 3D printing, it’s important to choose materials that bond well together to ensure the integrity and quality of the final product. Here are a few great combinations:
- PLA and TPU
- PLA and ABS
- PLA and PVA (PVA is a material used exclusively for supports)
Upgrades for multi-material printing
Some 3D printers can't handle multi-material printing out of the box, but they can with specific upgrades or accessories. A well-known example is the Prusa Multi-Material Upgrade 3. It fits many Prusa printers and can hold up to 5 different colors or materials.
With this upgrade, all 5 filaments are collected and fed through a single extruder. The upgrade is compatible with PLA, ABS, PETG, and soluble materials. One downside is that it creates more waste—sometimes even more than the print itself. However, updates to PrusaSlicer are constantly improving both the efficiency and the overall user experience.
If you have a Bambu Lab printer (like our X1 Carbon), the Bambu Lab AMS is what you’re looking for. You can load 4 rolls per AMS, and you can connect up to 4 AMS units to your Bambu Lab printer. Just keep in mind that these systems only work with Bambu Lab printers.
Looking to have something printed with multiple materials? You can do that with our 3D printing service, though you will need to request a custom quote.
