STL to G-Code Converter & 3D Print Takeoff Estimator

Q: Can I convert an STL file to G-code directly in my web browser?

Yes. Our client-side slicer parses the 3D triangle mesh from your STL file, calculates the bounding box and volumetric infill, generates layer path coordinates, and compiles a download-ready .gcode file directly on your device without server latency.

Q: How is 3D model volume calculated from an STL file?

Volume is computed using the signed divergence theorem (Euler tetrahedron summation). For every triangle facet in the mesh, the scalar triple product of its three vertex vectors divided by 6 is summed: Volume = Σ (v1 · (v2 × v3)) / 6. This produces the exact internal volume in cubic centimeters (cm³).

Q: How do you calculate filament weight from model volume?

Filament weight is determined by multiplying the effective plastic volume by the filament material density. Standard PLA has a density of 1.24 g/cm³, PETG is 1.27 g/cm³, and ABS is 1.04 g/cm³. Accounting for outer solid perimeters plus interior infill percentage gives the final weight in grams.

Q: What standard G-code commands are generated?

The generated G-code includes standard RepRap / Marlin / Klipper directives: G28 (Auto Home), G90 (Absolute Positioning), M104/M109 (Extruder Temp), M140/M190 (Bed Temp), G1 linear feed moves with E-axis extrusion coordinates, and M84 (Disable Steppers).

Q: How much does 3D printing filament cost per gram?

At an average price of $20 to $25 per 1,000-gram (1 kg) spool of standard PLA or PETG, raw material costs approximately $0.02 to $0.025 per gram. A typical 20-gram bracket costs less than $0.50 in material.

100% browser-based 3D slicer. Parse triangle meshes, calculate volume in cm³, filament weight, print time, and download sliced G-code.

100% Free & In-Browser Slicer Real Signed Divergence Math Downloadable .GCODE File Included

3D Model Input & Slicing Profile Local Parser

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Drop .STL File Here Binary or ASCII format (100% private in-browser parsing)

Takeoff Metrics & G-Code Export 112 Triangles

Filament Weight

18.5 grams

6.18 meters (1.75mm dia)

Est. Print Time

1 hr 42 min

@ 60 mm/s (0.2mm layer)

3D Solid Volume

38.4 cm³

50 × 40 × 30 mm

Total Job Cost

$0.54

Material $0.41 + Power $0.13

Interactive 3D orthographic wireframe preview: Drag to rotate model.

How 3D Mesh Volume & Print Times Are Calculated

Mathematical physics formulas for volumetric slicing and toolpath calculation:

Signed Divergence & Infill Math

Step 1 — Exact 3D Volume (Divergence Theorem):
Volume = Σ (v1 · (v2 × v3)) ÷ 6 over all triangles = 38,400 mm³ = 38.40 cm³
Step 2 — Sliced Infill Mass & Weight:
Mass = [Shell Volume (12.2 cm³) + Infill Volume (26.2 cm³ × 20%)] × Density (1.24 g/cm³) = 18.52 grams
Step 3 — 1.75mm Filament Length:
Length = Effective Volume (14.94 cm³) ÷ Area of 1.75mm Circle (0.02405 cm²) = 621 cm = 6.21 meters
Step 4 — Estimated Print Time:
Print Time = Total Toolpath Distance ÷ Speed (60 mm/s) + Layer Overhead (0.2mm layers) = 1 hour 42 minutes

2026 3D Printing Filament Material Property Reference

Comparing densities, print temperatures, material costs, and structural properties for rapid prototyping.

Filament Type	Density (g/cm³)	Nozzle Temp	Bed Temp	Avg Spool Price ($/kg)	Best Application
PLA (Polylactic Acid)	1.24 g/cm³	200 – 220°C	50 – 60°C	$18 – $24	Prototypes, Concept Models, Low Heat
PETG (Glycol Polyethylene)	1.27 g/cm³	230 – 250°C	70 – 85°C	$20 – $28	Water Resistance, Brackets, Outdoor
ABS / ASA (Weatherproof)	1.04 g/cm³	240 – 260°C	95 – 110°C	$22 – $32	Automotive, UV Sunlight, High Temp
TPU (95A Flexible)	1.21 g/cm³	215 – 235°C	40 – 60°C	$28 – $40	Gaskets, Bumpers, Vibration Dampers
PA-CF (Carbon Fiber Nylon)	1.18 g/cm³	280 – 300°C	80 – 100°C	$55 – $85	End-Use Jigs, Heavy Fixtures, High Rigidity

Frequently Asked Questions About STL Slicing & G-Code

Technical answers for 3D printing hobbyists, engineers, and makers.

Can I convert an STL file to G-code directly in my web browser?

Yes. Our client-side slicer extracts the 3D polygon triangles directly in your browser, computes the bounding geometry, projects layers at your chosen layer height, and generates standard Marlin/Klipper compatible .gcode instructions ready to load on an SD card or OctoPrint.

How is 3D model volume calculated from an STL file?

We use the signed divergence theorem. For each triangle facet in the STL mesh, we compute the volume of the signed tetrahedron formed by the triangle and the origin: Volume = Σ (v1 · (v2 × v3)) ÷ 6. Summing across all facets yields the exact closed volume down to fractions of a cubic millimeter.

How do you calculate filament weight from model volume?

Multiply the effective plastic volume (solid perimeters + infill density) by the specific gravity of the filament. For example, a 15 cm³ effective PLA volume multiplied by 1.24 g/cm³ density equals 18.6 grams of filament.

What standard G-code commands are generated?

The generated G-code includes standard commands: G28 (home all axes), M104/M109 (hotend heating), M140/M190 (bed heating), G92 E0 (reset extruder), G1 movement and extrusion lines, and M84 (turn off motors at completion).

How much does 3D printing filament cost per gram?

At $22 per standard 1-kilogram spool, filament costs approximately $0.022 per gram. Small brackets and adapters typically use 15 to 30 grams of material, costing under $0.70 each to produce.