How to prepare an STL file for 3D printing
Most failed prints are decided before the printer starts — in the file. Four checks cover almost everything, and the automatic mesh analysis on PrintBid3D flags them before a printer ever sees the job.
Export at a sane resolution
Exporting with a chord tolerance around 0.01–0.05 mm keeps curves smooth without exploding file size. Coarser exports show visible facets on round surfaces; finer ones add megabytes without adding quality, because the printer's resolution is the limit anyway.
Respect wall thickness
A wall thinner than about 0.8–1.0 mm cannot be printed reliably in FDM — the nozzle simply cannot lay down less than one or two lines. Resin manages roughly 0.5 mm. Design walls at 1.2 mm and above when the part should survive handling.
Make it watertight
A printable mesh is a closed solid: no holes, no flipped normals, no internal faces. Holes confuse the slicer into filling or hollowing the wrong regions. PrintBid3D analyses every upload for open edges and flipped normals and shows the risk level before the job can be posted.
Think about orientation and overhangs
FDM prints handle overhangs up to roughly 45° without support; steeper angles need support material that leaves marks. Orienting a part differently often removes supports entirely and moves layer lines away from the faces that show.
No CAD file? No problem
A photo of a paper sketch with measurements, or a PDF drawing, is enough for many printers — choose a design job and a designer redraws the part as a printable model before anything is produced.
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