+ How does SLS 3D Printing work?

SLS 3D Printing works by spreading a 0.1mm thin layer of Nylon powder over the build surface. A laser is used to selectively heat areas of the powder, fusing some of the particles together. The process is repeated with further layers added on top, bonding the fresh powder to the layer below. The fused areas are built up layer by layer resulting in solid plastic parts.

+ What is the largest part I can print with SLS?

The build volume of the ProX 6100 SLS machine is 280 x 330 x 420 mm. We frequently print larger models that have been split into sectioned to be assembled after printing.

+ What Applications can I use SLS 3D Printing for?

SLS is great for applications such as:

• Consumer Products
• Robotics
• Medical Devices
• Prototyping
• Low Volume Batch Production
• Injection Moulding Alternative

+ Does SLS 3D Printing require support material?

No, the parts are produced while surrounded by loose powder. Therefore the loose unmelted powder acts as a supporting material. This method of 3D printing is fantastic for producing complex geometries that would otherwise be impossible with technologies that require support.

+ What colours and finishes are available for SLS materials?

SLS parts come out of the machine white in colour with a powdery finish similar to an extra strong mint. Nylon parts can be post-processed with services such as Vibro-Polishing & Black Dye

+ Can I Hand Finish SLS Materials?

Yes you can, we have some tips on some common finishing solutions.

Sanding
Try using wet & dry sandpaper of around 400 grit. The black paper can sometimes stain the parts so make sure to use lots of water and change over the paper regularly.

Painting
Our SLS prints come in white as standard, which is great for painting but they come with a powdery texture which needs to be sorted before painting. Always start with primer and sand a little before painting with acrylic paint. We would suggest taking advantage of the free vibro-polishing service before painting your part.

Dyeing
We are specialists in dyeing white SLS parts black, but there are many other colours out there that you can try out. We recommend using rit dye for synthetics and a pressure cooker, though a normal pot should work fine. There is an amazing academic paper on SLS Nylon dyeing from Goldsmiths University.

Glueing
Due to the powdery nature of Nylon prints, it requires a thicker glue to bond parts together. We recommend a 2 part epoxy resin like Araldite or a thick super glue like mitre glue. Standard superglue will not work well as it dries too quickly on the surface of the parts.

+ Is PA12 Nylon Food Safe?

3D People’s PA12 material is certified as biocompatible and can be food safe under certain conditions. Though due to the porous nature of parts via the SLS printing method we can not certify our materials as food safe. Please use it at your own risk.

+ Can I Choose the Orientation of my SLS parts?

The best orientation for your part is one that reduces stepping and warping. This is chosen for you by expert technicians. If you require a special orientation for your part, then please send an email to print@3dpeople.uk after ordering and we will manually orientate your part in the build.

+ How can I make my SLS order cheaper?

The best way to save money with SLS printing is by using 3D nesting. Geometry dependent, you can group multiple files together to get a cheaper price. Here is our guide to 3D nesting which shows when and when not to utilise nesting to your advantage.