Accuracy of FDM printing

Accuracy of FDM printing

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When designing models to be printed on an FDM printer, there are several aspects to be considered. First, we will review some terms that may be helpful to you, then we will present the most widely used FDM plastics and some common printing issues that can occur.

Layer height: The diameter of the layer height determines the resolution used to print a model. It determines the thickness of each layer in order to complete the 3D model. Please be aware that layers are very visible on FDM prints.

Tolerance: The possible accuracy of the part once it is 3D printed. It is the discrepancy between the dimensions of the design itself, and that same design when printed. It always refers to the largest measurement along one side.

Minimum Wall Thickness: As with all 3D printing technologies, there are certain design requirements required for a part to be printable. One of the crucial ones is the wall thickness of the model. If the model does not comply with the minimum thickness, it would not be printable.

 

PLA:
Layer height: 0.2 mm
Tolerance: ±0.2 - 0.5% (with a lower limit of ±0.2 - 0.5 mm)
Min. Wall thickness: 1 mm
Possible details: 0.6 mm

 

Fillamentum releases PLA Extrafill Vertigo Galaxy FDM 3D printing filament  - TCT Magazine

 

ABS:
Layer height: 0.2 mm
Tolerance: ±0.2 - 0.5% (with a lower limit of ±0.2 - 0.5 mm)
Min. Wall thickness: 1 mm
Possible details: 0.6 mm

ABS.webp

PETG:
Layer height: 0.2 mm
Tolerance: ±0.2 - 0.5% (with a lower limit of ±0.2 - 0.5 mm)
Min. Wall thickness: 1 mm
Possible details: 0.6 mm wide and 2 mm deep

petg.webp

TPU:
Layer height: 0.2 mm
Tolerance: ±0.3 - 0.5% (with a lower limit of ±0.3 - 0.5 mm)
Min. Wall thickness: 1.5 mm
Possible details: 1 mm
However, these parameters may vary depending on the shore hardness of the TPU filament used (75A to 100A)

3d_printing_case-hero-2.webp

FDM printing - common issues

When printing models using FDM machines the results may vary as this technology has limitations in terms of accuracy.

Printed models may have some of the following defects due to the limitations:

      > The print bends upwards or has a warping issue (common for large, flat designs).

      > The effect known as a “elephant foot”, in which the base protrudes slightly.

      > Visible internal supports.

      > The part has cracks (common for large prints).

   > Unaesthetic plastic strings between the parts of the model.

      > Visual waves or rippling on the print surface


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1 comment

  • Tara

    Hi there, do you have more information and better images?

    Tara
    1