The "they" I will talk about today refer to SLA and FDM industrial 3D printers. Each type of printer has its inevitable advantages, and there is bound to be a contrast. This time we will look at the differences between the two models.
1. Printing accuracy
The FDM model is to obtain parts by stacking the molten materials layer by layer according to the nozzle extrusion. The product steps are more obvious (surface texture), and it is not suitable to build large parts. 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 clogging of consumables, so the smaller the nozzle, the better.
The SLA industrial 3D printer model is laser-cured, and it has an advantage in accuracy that the FDM model cannot surpass. The layer thickness can be accurate to 0.05mm, and the surface quality of the general photosensitive resin material is smooth, easy to post-process, and can be made into a variety of complex precision parts and assemblies.
2. Basic principles
FDM, "Fused Deposition" technology, heats and melts ABS, PLA and other wire materials according to a heating device, and then squeezes out the toothpaste like a toothpaste according to the extrusion, layer by layer, and finally forms. Its mechanical structure mainly includes five parts: nozzle, wire feeding mechanism, operating mechanism, heating studio and workbench. The materials used in the fused deposition process can be divided into two parts: one is the molding material, and the other is the support material.
SLA, "three-dimensional light curing molding", the laser draws the shape of the first layer of the object on the surface of the liquid photosensitive resin, then a platform is made to lower the corresponding distance, and then the cured layer is infiltrated into the liquid resin. This is repeated until the printing is formed. Finally, after the prototype is removed from the resin, the final curing is completed, and then the specified product is obtained by polishing, electroplating, painting or coloring.
3. Forming space
FDM3D printers have various structural forms, including XYZ frame structure, delta structure, and robotic arm, so the molding space can be made smaller and larger. However, the mechanical structure of large-size FDM models usually suffers from poor stability and slow printing speed, which cannot meet the long-term printing needs of customers.
SLA is the first rapid prototyping manufacturing process that is printed according to the movement of the optical axis. In theory, it can be made larger in size. However, in view of the SLA industrial 3D printer model, the depth of the positive swing toward the resin cylinder should be the same as the height of the workpiece, and the molding space needs to be filled with resin material, which also means that the equipment volume needs to be particularly large. In addition, every time the material is changed, the entire material tank must be drained.
4. Printing supplies
FDM machines are currently widely used, and consumables are relatively cheap, mainly including PLA, ABS, TPE, TPU, etc. Among them, PLA is a biodegradable thermoplastic that does not form a very pungent smell during printing, 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 that of PLA. The platform needs to 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 more difficult to print, especially compared to the remote feeding 3D printer, it is difficult to control the advance and retreat of flexible materials.
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 has odor and toxicity and needs to be sealed. At the same time, to prevent the polymerization reaction from occurring in advance, it needs to be protected from light.
FDM industrial 3D printer equipment mainly involves mechanism movement and control. Relatively speaking, the technical threshold and cost are relatively 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. The technical threshold of SLA industrial equipment is relatively high, and there are fewer 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.
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 can be used to make prototypes such as automobiles, medical equipment, electronic products, and architectural models. Special attention must be paid to the fact that photosensitive resin has odor and toxicity and needs to be sealed. In addition, to avoid premature polymerization, it must be protected from light.
FDM industrial equipment is mainly related to the movement and control of the mechanism. Relatively speaking, the technical threshold and cost are relatively low. In addition, the utilization efficiency of raw materials is high and there is no pollution from toxic gases or chemical substances, which greatly reduces the molding cost. The technical threshold of SLA industrial equipment is relatively high, and equipment manufacturers are relatively small but strong. An industrial 3D printer equipment ranges from 300,000 to several million. Although the prices of the two are several times different, they are still very suitable for companies that require high-precision module manufacturing.