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Wall Thickness Requirement

In 3D models, inner and outer surface close to form a wall. If the walls are too thin, your parts will be unable to print or very fragile. Minimum wall thickness is defined as the minimum thickness that your model should have at any one given point. You should make sure your models meet the indicated thickness of corresponding material. There are two kind of walls.

Supported walls are connected to walls on two or more sides. 

Unsupported walls are connected to walls on less than two sides. 

After the models are printed out, they need to do some processing such as support material removal, grinding, sandblasting, these processes determine the minimum thickness of different materials. Only when the wall thickness reach the minimum requirement can your items be printable.

If there are supported walls in your design, the wall thickness should be adjusted according to the size of your supported wall area. Details are as follows (if you choose 100 micron high-toughness resin, supported wall area size is within 5 mm* 5mm, the minimum wall thickness is 0.6mm):

Material5*5mm10*10mm50*50mm100*100mm200*200mm
100 μm resin 0.6mm 0.8mm 1mm 1.2mm 1.5mm
100 μm high-toughness resin 0.6mm 0.8mm 1mm 1.2mm 1.5mm
100 μm transparent resin 1mm 1mm 1.2mm 1.5mm 2mm

If your design has unsupported wall, then the minimum wall thickness should be as follows:

MaterialMin. Wall Thickness
100 μm resin 1mm
100 μm high-toughness resin 1mm
100 μm transparent resin 1mm

Escape Hole Requirement

For models with hollow cavities, they need to fill with powder which will later be removed from escape hole. Extra material will fall out of the escape hole and hallows out the model as a result. 

Make sure the hollow section contains a sufficiently large escape hole, pore diameter should at all times be greater than 2mm.

If the escape hole diameter does not meet the minimum requirements, in order to fully clean the extra materials, you may increase the diameter of existing escape hole, add more escape holes or infill hollow space.

In particular, a single escape hole may not allow the extra material fully fall out, we recommend using multiple escape holes.

Wire Thickness Requirement

A wire is convex detail in your model whose length is greater than 2 times its width. There are two kinds of wires:

Supported wires are connected to walls on two or more sides. 

Unsupported wires are connected to walls on less than two sides.

Processes such as support material removal, grinding, sandblasting determine the minimum wire thickness of different materials. Different material has different wire thickness requirements.

MaterialMin. Supported wireMin. Unsupported wire
100 μm Resin 1.2mm 1.5mm
100 μm High-toughness Resin 1.2mm 1.5mm
100 μm Transparent Resin 1.5mm 0.5mm

The items can be printed only when the wire thickness is greater than the minimum thickness requirement. If your design can not reach the requirement, you should try to increase the wall thickness or consider a tougher material.

Embossed and Engraved Details 

An embossed detail is convex portion in your model whose length is less than 2 times its width.

Usually, the minimum embossed details are determined by printer’s accuracy. But different material has different requirements on minimum height/width for embossed details: (for example, the height and width of embossed details for 16 μm transparent resin must be larger than 0.5mm)

Material100 μm Resin100 μm High-toughness Resin100 μm Transparent Resin
Min. Depth/Width 1.2 mm 1.2 mm 0.8 mm

If the height and width of embossed details are less than the minimum requirement, try to make them larger, remove them, or choose a material with finer detail. Otherwise, your items can not do processing such as grinding and spraying.

An engraved detail is concave portion in your model whose depth is less than 2 times its width. If the concave portion whose depth is greater than 2 times its width, it is called deep hole.

Usually, the minimum engraved details are determined by printer’s accuracy. But different material has different requirements on minimum height/width for engraved details. (for example, the depth and width of engraved details for 16 μm transparent resin must be larger than 0.5mm)

Material100 μm Resin100 μm High-toughness Resin100 μm Transparent Resin
Min. Depth/Width 1 mm 1 mm 1.5 mm

If the depth and width of engraved details are less than the minimum requirement, try to increase the depth/width, remove them, or choose a material with finer detail. Otherwise, your items can not do processing such as grinding and spraying.

Minimum Angle for Sharp Part

Typical sharp surface refer to below diagram:

When the wall thickness is too thin or bear heavy weight beyond its range, the sharp surface models are very easy to be damaged during support material removal, grinding, packing and shipping processes.

The angle for the sharp should at all times greater than 20°. If your design can not meet the requirement, try enlarging the angle, removing the sharp part or considering a suitable material.

Minimum Clearance

The clearance is gap between parts, walls or wires.

The items can only be printed when the clearances are greater than the indicated minimum. Different materials has different requirements.

Material100 μm Resin100 μm High-toughness Resin100 μm Transparent Resin
Min. Clearance 2 mm 2 mm 2 mm

When the clearance is too small, the supported material can not be cleaned, therefore, you may increase the gap or select a suitable material. You may even consider fusing the two independent parts if their independence is unnecessary.

Screw Thread Requirements

Screw pitch are axial distance between the corresponding points of two adjacent teeth on the threads.

Tooth angle is the angle between the two sides of the thread.

Printer’s accuracy affects the screw pitch and tooth angle. But different material has different minimum screw pitch and tooth angle. See the following table:

Material100 μm Resin100 μm High-toughness Resin100 μm Transparent Resin
Min. Screw pitch 0.6 mm 0.6 mm 0.8 mm
Min. Tooth angle 20° 20° 20°

Deep Hole and Curved Hole

If there are deep holes, curved holes and blind holes in your model. They neet to meet the minimum diameter.

Different material has different requirements on minimum diameter for the holes. 

Material100 μm Resin100 μm High-toughness Resin100 μm Transparent Resin
Min. Depth/Width 1.2 mm 1.2 mm 1.2 mm

Shaped Models

Shaped models are those with irregular shapes and light weight. For shaped models, we will quote according to special specification. Please note that some of them may not be printed.

See below examples:

1. Models that take up large space in printer.

2. Models with complex structure and require to remove many support materials manually.

3. Models with too complex structure that may not make successful products.