3D Printing & CAD Guides

Practical, specific write-ups on the problems that come up constantly in FDM 3D printing and CAD-to-print workflows — wall thickness, mesh errors, file formats, and nozzle selection. No filler, no generic listicles: every guide here reflects the same engineering LuminaMesh's tools are built on.

Troubleshooting

Why Are My 3D Prints Failing? Thin Walls & How to Fix Them

Why slicers silently skip thin geometry, how to catch it before printing, and how the repair actually works.

Minimum Wall Thickness by Material

Practical minimums for PLA, PETG, ABS, ASA, TPU, nylon and polycarbonate — and why designing to a multiple of line width matters more than the raw number.

Choosing a Nozzle Size: 0.2mm to 0.8mm Compared

How nozzle diameter changes print time, detail, strength and minimum wall thickness, with guidance on when switching is worth it.

Troubleshooting

Non-Manifold Edges, Flipped Normals and Holes: STL Errors Explained

Which mesh errors will actually ruin a print, which are cosmetic, and how to triage a repair report.

How to Convert STEP Files to STL or 3MF for 3D Printing

What STEP files actually store, the multi-body assembly problem, and how to convert for free in your browser.

STEP vs STL vs 3MF: Which CAD File Format Should You Use?

What each format actually stores, their real tradeoffs, and a practical recommendation by scenario.

Preparing CAD Models for 3D Printing

What breaks when engineering CAD models get 3D printed instead of machined or molded — undersized holes, thin ribs, tight tolerances — and how to fix each.

Print Orientation and Part Strength

Why FDM parts are anisotropic, how orientation determines where a part will actually fail under load, and how to choose one.

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