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Layer Height

As we all know, stereolithography SLA/DLP/LCD 3D printing creates a part by reproducing it layer by layer. As the name implies, layer height refers to the thickness of each layer. Because of this additive characteristics, the height of each layer naturally determines the accuracy of the Z-axis direction and especially leaves the influence on curves and angles.

For example, to print a cylinder with a hole, your software must slice it into multiple layers and then stack them which will form an unsmooth edge that looks like a staircase. This is known as the ladder effect, which becomes more obvious on surfaces with greater curvature.

Layer height not only affects printing quality, but also printing time. The total number of layers to generate a part determines the surface quality and the time required to print it. The thinner the layer height, the more the model will be sliced, resulting in longer printing times. Relatively, the thinner the layer height, the better the surface quality, resulting in smoother surface and clearer vertical details.

At this point, it is necessary to strike a balance between quality and speed. In general, 3D printers vary in technology, and the range of layers they can generate is also slightly different as some printers can print even thinner layers. The layer height is measured in mm (mm) or in micron (µm), with the most common setting of 50µm (0.05mm).

If you have a layer height of 0.2mm the same exposure time will be substantially longer than that of a 0.05mm layer.

If the z-axis of the machine is not stable enough, higher layer height settings under the higher printing speeds (like 100 mm/min lift speed, 200 mm/min retract speed) will aggravate this instability which leads to layer separation, fragmentation and even shifting.

Having tested the FunToDo resin range I have found that the best results come at 0.05mm to 0.03mm layers in the smaller domestic machines.

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FTD Resins

Sample product

F1+ Blend

Designed for laser 3D printers

Dental part

Dentifix-3D

Dental resin high & low reactivity

Model figure

Industrial Blend

Excellent all round resin

 
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