If possible, try to hollow out your part. This avoids deformation and discoloration during the printing process. You can either hollow out your part without a surface hole, which means that unsintered powder will remain trapped inside, or you can design a strategically placed hole (two would be even better) so that the unsintered powder can be easily removed after printing. If the part needs to be reclosed, design a lid with a diameter allowing for 0.5 mm play between the part and the lid.
If your part has walls thicker than 5 mm, our production team may hollow out the part to prevent deformation and discoloration. For parts with wall thickness higher than 10 mm wall thickness, this is done by default. In that case, the powder will stay trapped inside.
Holes and Channels
Holes with a small diameter are exposed to a lot of heat during the sintering process. This can cause the powder inside the holes to become fused. To make sure that holes in your parts remain clear, design a diameter of at least 1 mm.
Longer internal channels can be difficult to clear out, especially if the powder is partially sintered together. We recommend a diameter of at least 3 mm for internal channels.
Warpage and Deformities
Interlocking or Moving Parts
When designing parts that need to be assembled, it’s important to maintain enough distance between the parts. A perfect fit in your CAD software does not necessarily ensure a perfect fit after printing because your software ignores the friction present in the real world. Therefore, always leave at least 0.6 mm between the different parts. For parts with large surfaces and wall thicknesses, you will need to maintain even more distance between the parts.
In order to help us print your parts with the best possible dimensions for assembly, please design your files with an orientation equal to the relative orientation of your parts in the final assembly.