Selective Laser Sintering

Founded in 1978, Zhongde is a professional injection molding supplier focusing
on OEM & ODM customized services. Based on 40 years technology deposition, we
have developed a one-stop solution from mold designing and rapid prototyping to
mass production. Our manufacturing capabilities include plastic injection
molding service, compression molding service, CNC machining service, metal
stamping service, 3D printing service, custom molding service,etc.

Selective Laser Sintering (SLS) is an industrial 3D sintered laser printing
process ideal for manufacturing end-use parts. In SLS, a laser selectively
sinters polymer powder particles, fusing them together and building a part
layer-by-layer. From prototyping to small-batch production, our 3d laser
sintering printing facilities will allow you to produce highly accurate parts
with quality and strength comparable to injection molding.Now the selective
laser sintering cost is low.

SLS produces functional plastic parts with isotropic mechanical properties that
can be used for detailed prototyping or end-use low-volume production.

Guideline of Fused Deposition Modeling

Size of Selective Sintering
Below table shows the size of Fused Deposition Modeling parts we usually make.
If you need a larger size, we can also help you achieve it.

Standard capabilities Description
Maximum build size * 300 x 300 x 300 mm (11.8” x 11.8” x 11.8”)
Lead time * 6 business days
Dimensional accuracy ± 0.3% with a lower limit of ± 0.3 mm (± 0.012”)
Layer thickness 100 μm
* For expedited lead times or parts that exceed the maximum build size contact
sales@zdcpu.com.

Available Materials of Selective Laser Sintering

In addition to the general materials listed below, Zhongde can also modify the
materials according to the special needs of customers. Our professional
engineers will adjust the raw material formula to meet the unique conditions of
use.

Material Description
Nylon 12 (PA 12) SLS nylon is a robust thermoplastic with all-around
excellent physical properties, ideal for functional prototypes and end-use
applications.
Glass-filled Nylon (PA 12 GF) Glass-filled SLS nylon is reinforced with glass
beads creating parts with higher stiffness and thermal stability than standard
nylon.
TPU / TPE / TPA * Thermoplastic elastomers combine high elasticity and
strength with good chemical resistance, making them ideal for functional,
flexible parts.
These materials are available by contacting sales@zdcpu.com.

Design Guidelines of Selective Laser Sintering

The following table summarizes the recommended and technically feasible values
for the most common features encountered in 3D printed parts.

Feature Recommended size
Unsupported walls 1.0 mm (0.040'')
Supported walls 0.7 mm (0.030'')
Minimum detail size 0.25 mm (0.010'')
Minimum hole size 1.0 mm (0.040'')
Moving parts 0.5 mm (0.020'') between moving surfaces
Assembly clearance 0.4 mm (0.016'') between mating surfaces
Maximum wall thickness 20 mm (0.8''). Thicker parts must be hollowed with and
at least two escape holes for powder removal with a min. diameter of 8 mm
(0.3'').
Available Surface Finishes of Selective Laser Sintering

Additional post processes can be applied to improve the appearance or
mechanical properties of parts produced with SLS.

Finish Description
As printed As printed SLS parts are typically white or stone grey in color
with a smooth surface and a powder texture and without visible layers.
Dyed SLS parts can be dyed by immersing in a warm color bath to a variety of
colors. The color penetration reaches an approximate depth of 0.5 mm and covers
all surfaces.
Tumble smoothing * The parts are placed in a tumbler that contains small
ceramic chips, gradually eroding its surface down to a polished injection
molding-like finish.
Bead blasting Bead blasting (shot pinning) adds a uniform matte or satin
surface finish on a 3D printed part. *
Spray painting * SLS parts can be spray painted white, black or to a
specified RAL or Pantone color.
Water tightening * SLS parts are vacuum impregnated with resin, sealing
all internal porosity and ensuring water tightness.
Metal plating * Electroplating (nickel, copper or gold) is an ideal solution
for parts that require a metallic appearance, without the high costs associated
with metal 3D printing.

Minimum Order: 100 pieces

Click to Enlarge