Dimensional Accuracy

FDM parts need to be produced within an accuracy of ±0.5 mm or 1% depending on which is greater. For example, in the case of a 40 mm cube, a 1% accuracy requirement would result in a max of 0.4 mm deviation. As this is below 0.5 mm, the 0.5 mm is leading and determines the maximum. A printed part of 40.2 x 39.7 x 39.6 mm would be acceptable as the deviations are within this 0.5 mm. Printing a cube that is 38.8 x 39.4 x 39.4 mm would not pass the dimensional accuracy requirements as the width deviates more than 1 mm.

Surface Quality

Consistent Surfaces. The final print shouldn’t have any inconsistent surfaces. Retraction marks and a layer changing “seam” are acceptable. No delamination. The layers should be firmly attached, resulting in a print without gaps or cracks. Small details. Details larger than 0.8 mm in the model should be well discernible in the print.


All support material must be removed and brought down to a level where the surface is continuous. Small traces of support material are often unavoidable and acceptable.


These guidelines apply to all FDM orders on 3D Hubs and can only be deviated from when specifically discussed and agreed upon between Hub and Customer in the comments section on the order page.


If a customer raises a dispute, prints are reviewed against these quality guidelines. If the print doesn’t meet the guidelines, the customer will be fully refunded.

Appendix : Poor quality example


Printer does not extrude enough plastic, gaps between perimeters and infill


Printer extrudes too much plastic, prints looks very messy

Stringing or Oozing

Lots of strings and hairs left behind when moving between different sections of the print

Gaps in Top Layers

Holes or gaps in the top layers of the print


Small features become overheated and deformed

Curling or Rough Corners

Corners of the print tend to curl and deform after they are printed


Warping of large parts, particularly with high temperature materials such as ABS

Dimensional Accuracy

Dimensional issues where the measured dimensions do not match the original design intent

The poor quality sample are credited to: Simplify3D quality troubleshoot guide

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