1 – Prepare your 3D file
The first step to start your manufacturing process with additive manufacturing is to create a digital 3D model (a file such as a STL file) of the product you want to make physically. You can do this by using 3D modeling software to create your object. Discover our selection of free CAD software to develop your project.
Preparing your file for 3D printing with SLA is an essential step in your process. This 3D file has to be perfectly printable. At Sculpteo, we see a lot of 3D models with errors, resulting in non-printable files. Moreover, even if the part is 3D printable, your part has to be resistant enough so it doesn’t break or be deformed. Find out how to overcome these common 3D printing mistakes. Good news for you, as the SLA technology can create a complex object, you will have the opportunity to have a detailed and exact 3D model for your project.
2- Get the SLA 3D printer ready to print
SLA 3D printers are usually desktop 3D printers with a high resolution. The majority of print settings are defined by the manufacturer and cannot be altered. The layer height and portion orientation are the sole inputs.
If you don’t have your SLA 3D printer, you can use an online 3D printing service such as Sculpteo, and any technical preparation will be done for you by our operators! Sculpteo uses Formlabs 3D printers to 3D print your parts with excellent quality and reliability.
3- 3D printing process
Once all setup checks have been made, the printer is prepared to print; the laser will cure the photopolymer resin according to your 3D model until the print is complete.
There are two different setups for stereolithography 3D printers: top-down and bottom-up printers.
Top-down printers place the laser source above the tank, and the part is built facing upwards. The build platform begins at the top of the resin vat and moves downwards after every layer.
Bottom-up printers place the light source under the resin tank, and the part is built upside down. The tank has a transparent bottom with a silicone coating that allows the laser’s light to pass through but stops the cured resin from sticking. After every layer, the cured resin is detached from the bottom of the tank as the build platform moves upwards. This is called the peeling step.
4- 3D printing post-process
After the 3D printing process, the parts need to be rinsed in isopropyl alcohol to remove the uncured resin from their surface. Some materials must be post-cured once washed sections have dried; this procedure helps components achieve maximum strength and stability. After removing supports from the printed parts, you can then sand the remaining support marks for a clean finish.
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