SLS&SLA 3D printing

The SLS 3D printing process is also known as “Selective Laser Sintering Technology“. Its working principle is shown in Figure 2. By selectively melting the required part of the material in the section, a layer of section is produced, and then a layer of material is placed on top to continue to melt the required part of the material. This cycle is repeated until all the sections are completed, and the finished product is formed on the workbench. Since a laser beam is used to melt the material, the material can be resin or metal. Also based on its ability to print on metal, compared with other 3D printing technologies, SLS 3D printing technology has been widely used in the industry [1].

SLS 3D printing

1. Pre-print processing:

Compared with the FDM process, the SLS 3D printing technology has the characteristics of high precision and no support [1], the model needs almost no simplification before printing, and only needs some simple repairs. Since the author won a 300 yuan printing coupon, the maximum volume that can be printed is about 30% of the original model (SLS printing is still very expensive…). But from another point of view, saving material while shortening printing time.

SLS 3D printing sample

2. SLS 3D printing:

Models 3D printed with HP Nylon SLS have extremely high dimensional accuracy. In addition, the surface is granular, graphite gray, and the characteristics of matte texture make it have perfect detail expression.

SLS 3D printing samples

3D printing samples

 

3. SLA 3D printing:

Speaking of this, some friends may be surprised that the printing of the model that is reduced to 30% will cost 300RMB. How did the unscaled quadrotor drone that I pushed before print it out?
There is only one truth. For the quad-rotor drone racks that are larger in size and require more printing materials, the author chose a 3D printing process with a moderate price (1.2 yuan per cubic centimeter) and relatively high precision—— SLA 3D printing process.
SLA 3D printing, also known as “light curing molding technology“, refers to a printing method that uses ultraviolet light to irradiate liquid photosensitive resin to polymerize to solidify layer by layer and generate a three-dimensional entity [2]. Its forming principle is similar to “three-dimensional image photocopying”.

SLA 3D printing modelSLA 3D printing principle

SLA 3D printing sample

 

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