3D Printing & STL Guides
Clear, beginner-friendly guides that take you from "what is an STL file?" all the way to a finished print. No jargon for its own sake — just practical, accurate explanations written for makers, students, and anyone new to 3D printing.
Start here — STL & file formats
What Is an STL File?
A complete beginner's guide to the STL format: how it stores 3D geometry as triangles, ASCII vs binary, and where it fits in 3D printing.
STL vs OBJ vs 3MF
The three main 3D-printing file formats compared — what each stores, their strengths, and which one to reach for and when.
Water-Tight & Manifold Meshes
Why a printable mesh must fully enclose a volume, the defects that break it, and how to check and repair your models.
STL Units: mm vs Inches
STL files have no units — why a model imports 25.4× too small, how to spot a unit mix-up, and the exact scale factors that fix it.
Getting a clean, printable model
STL Resolution & Tessellation
How much mesh detail you actually need, the smoothness-vs-file-size trade-off, and when extra resolution is just wasted bytes.
Wall Thickness in 3D Printing
The nozzle-width rule, safe minimums, and how to set wall thickness on rings, tubes and pipes so they print solidly.
Infill Explained
What infill density and patterns actually do — balancing strength, weight, filament use and print time, and which setting to reach for.
How to Repair STL Files
Holes, flipped normals and non-manifold edges — how to diagnose a broken mesh and fix it in minutes with free tools.
Tolerances & Clearances
How accurate FDM printing really is, why holes print undersized, and the clearance numbers that make parts slide, snap or press together.
From model to finished print
Best Free Slicer Software
Cura, PrusaSlicer, OrcaSlicer and Bambu Studio compared — what each does best and how to choose the right one for your printer.
How to 3D Print a Shape
A step-by-step walkthrough from picking a shape in your browser to pulling a finished part off the print bed.
Supports & Overhangs
The 45° rule, when you actually need supports, tree vs normal supports, and how to orient a shape to avoid them.
Resin vs FDM
How filament and resin printers really differ on detail, strength, cost, mess and speed — and which one fits your projects.
Geometry, ideas & inspiration
Platonic Solids & Polyhedra
A maker's reference to the five Platonic solids — faces, edges, vertices, duals, and why they print so well.
15 Geometric Project Ideas
Practical, beginner-friendly things to make with simple primitives — from planters and dice to pendants and ornaments.
Ready to make something?
Put these guides into practice. Pick a shape, tune its dimensions, and export a water-tight, print-ready STL right in your browser — free, no sign-up, nothing uploaded.
Open the STL generator →