How to choose an industrial 3d printer
How to choose an industrial 3d printer
August 26, 2020
accuracy of FDM 3D printers,printed products
How to judge the accuracy of FDM 3D printers
August 26, 2020

The difference between SLA 3d printer and FDM 3d printer

FDM 3d printers,variety of 3D printer materials

SLA 3d printers and FDM 3d printers are both industrial-grade 3d printers. Many friends do not know about these two printers. In fact, compared to FDM industrial-grade 3D printers, the more expensive industrial-grade SLA printers have better printing speed and molding accuracy. Dominate. Next, I will give you a comparison of the main differences between the two?

1. Different working principles

SLA, “three-dimensional light curing molding”, the laser beam outlines the shape of the first layer of the object on the surface of the liquid photosensitive resin, and then the production platform is lowered a certain distance, and then the cured layer is immersed in the liquid resin, and this is repeated until the printing is formed. After the prototype is taken out of the resin, the final curing is carried out, and then the required product can be obtained by polishing, electroplating, painting or coloring.

FDM, “Fused Deposition” technology, heats and melts ABS, PLA and other wire materials through a heating device, and then squeezes it out like toothpaste, piles up layer by layer, and finally takes shape. The mechanical system mainly includes 5 parts: nozzle, wire feeding mechanism, movement mechanism, heating studio and workbench. The materials used in the fused deposition process are divided into two parts: one is the molding material, and the other is the support material.

2. Different printing accuracy

The SLA industrial model is laser-cured and molded, and has the insurmountable advantages of the FDM model in accuracy. It can produce various complex precision parts and assembly parts.

 FDM 3d printers,variety of 3D printer materials

The FDM model is to obtain parts by extruding molten material through a nozzle layer by layer, and the step effect of the finished product is obvious (surface texture). In addition, theoretically, the smaller the diameter of the nozzle of the FDM model, the higher the accuracy, but the smaller the nozzle, it is also easy to cause the consumables to block, so the smaller the nozzle, the better

3. Different printing consumables

The SLA technology 3D printer uses a UV laser or light projector to continuously track each sliced ​​layer of the object, and cure the photosensitive resin layer into a hardened plastic until the final 3D model is formed. SLA model consumables are liquid photosensitive resin, which has the characteristics of fast curing, high molding accuracy, good surface effect and easy post-processing. It is suitable for the production of prototypes such as automobiles, medical equipment, electronic products, and architectural models. It should be noted that the photosensitive resin needs to be hermetically sealed, and at the same time, to prevent premature polymerization, it needs to be protected from light.

FDM machines are now more popular, and consumables are relatively cheap, mainly including PLA, ABS, TPE, TPU, and composite materials doped with a variety of enhanced powders. Among them, PLA is a biodegradable thermoplastic, so it is relatively safe and suitable for use in offices, classrooms and homes. ABS is a high-strength, tough, and easy-to-process thermoplastic polymer material. Its melting point is higher than PLA. The platform must be heated during printing to avoid warping and shrinking of the consumables due to bad cooling. TPE/TPU flexible materials can make objects with particularly good stretchability. However, it is difficult to print, especially for 3D printers with remote feeding, it is difficult to control the advance and retreat of flexible materials.

 FDM 3d printers,variety of 3D printer materials

There are a wide variety of 3D printer materials using FDM technology, making the application fields of FDM 3D printers very wide. At the same time, due to the open source of FDM technology, enthusiasts can also customize the 3D printer, so that printing settings and hardware accessories can be changed according to different needs to adapt to the needs of more specialized scenarios.

4. Different molding space

SLA is the earliest rapid prototyping manufacturing process. It is printed by moving the optical axis. In theory, it can be made to a large size. However, because the SLA industrial model adopts the forward swing resin cylinder to have the same depth as the workpiece height, the molding space must be filled with resin material, which also means that the equipment must be very large. At the same time, every time the material is changed, the entire material tank must be emptied.

FDM 3D printers are flexible and diverse in architecture, with XYZ frame structure, delta structure, and robotic arm, so the forming space can be made small or large.

5. Difference in purchase cost

The technical threshold of SLA industrial equipment is relatively high, and there are relatively few equipment manufacturers but relatively strong strength, ranging from 300,000 to millions of industrial equipment. Although the price difference between the two is several times, it is still very worthwhile for companies that require high-precision module manufacturing.

FDM industrial equipment mainly involves mechanism movement and control. Relatively speaking, the technical threshold and cost are low. In addition, the utilization efficiency of raw materials is high and there is no poisonous gas or chemical pollution, which greatly reduces the molding cost.

Recommended reading《How to choose an industrial 3d printer

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