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Practical 3D printing guides from a working shop: materials, licensing, tolerances, strength, post-processing, and when printing beats buying. Straight answers, no hype.

3D Printing Basics3D printing (FDM) builds an object one thin layer of melted plastic at a time, following a digital model. It's ideal for custom, low-volume, and replacement parts you can't buy off a shelf — not for mass production or perfectly smooth surfaces straight off the bed.Fundamentals · 10 minLicensing ExplainedA 3D model's license controls what you may do with it: print for yourself, sell prints, or modify and share. Most community models use Creative Commons variants; 'NC' means no commercial sale, 'ND' means no derivatives, 'SA' means share-alike. Always read the license before you print for money.Rights & Legal · 12 minChoosing Your First PrinterFor a first printer, prioritise a reliable enclosed or well-supported machine with a heated bed, a hardened nozzle option, and a large user community — not the highest advertised speed. Bambu, Prusa, and Creality all make solid starters. Build volume and material range matter more than headline numbers.Getting Started · 15 minMaterials GuidePick your material by what the part must survive. PLA for display and prototypes, PETG for general outdoor and functional parts, ABS/ASA for heat and UV, TPU for anything that must flex, and carbon- or glass-filled grades when you need stiffness at low weight.Materials · 14 minPost-Processing FundamentalsPost-processing turns a raw print into a finished part: remove supports cleanly, sand from coarse to fine grit, prime, then paint or vapour-smooth. How far you go depends on whether the part is functional (minimal) or display-grade (full finish).Finishing · 16 minWhen to Print vs BuyPrint it when the part is custom, discontinued, low-volume, or needs fast iteration. Buy it when a mass-produced version is cheaper, stronger, or safety-critical (helmets, load-rated hardware). 3D printing wins on availability and customisation, not on beating a factory's per-unit price at scale.Decisions · 12 minHow to Price Prints FairlyA fair print price covers material, machine time, electricity, failure rate, post-processing, and your labour — then a reasonable margin. Charging only for grams undervalues the work; charging like a boutique overprices routine parts. Transparent, itemised quotes keep it honest on both sides.Business · 14 minChoosing Filaments ResponsiblyThe most responsible filament choice is usually the one that makes a part last, not the 'greenest' label. PLA is plant-based but not readily home-compostable; the biggest wins are printing right the first time, minimising failed prints and waste, and choosing durability over disposability.Materials · 13 minDesigning for Strength vs LooksA printed part's strength is set mostly by print orientation, wall count, and infill — not just the material. Layers bond weakest along the Z axis, so orient a part so load runs across layers, use 3–5 perimeters for real strength, and reserve high infill for parts that actually carry load.Design · 15 minUnderstanding TolerancesPrinted parts rarely come out at the exact modelled size — materials shrink as they cool and nozzles over-extrude slightly. For parts that fit together, design in a clearance of roughly 0.2–0.4 mm, test with a small tolerance gauge, and adjust for the specific material and printer.Design · 14 min

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