Free sample CAD and 3D files
Real drawings you can open, measure and export — not placeholders. Every file below opens in the viewer with one click, or downloads for use in your own software. No signup, and nothing is uploaded anywhere.
11 files, ready to open
Apartment floor plan
A two-bedroom apartment shell with double-line walls, door swings, window openings, furniture blocks, room labels and overall dimensions. Layers follow the AIA convention (A-WALL, A-DOOR, A-GLAZ, A-DIMS, A-ANNO, A-FURN), so it is a good file for testing layer visibility.
Mounting bracket
An L-profile machined bracket with four bore holes, centre-lines, linear dimensions and a material note. Useful for checking circle and centre-line rendering and for trying the measurement tool against known dimensions.
Distribution board schematic
A single-line distribution board with live and neutral rails, five breaker drops, lamp and motor symbols and circuit tags. Text-heavy, so it is the best file for testing the in-drawing text search.
Residential site plan
A plot boundary with building footprint, driveway, road frontage, tree canopies and labelled contour lines. Good for testing polyline rendering and larger coordinate ranges.
Steel web connection
A universal beam web connection detail with eight bolt positions, centre-marks and dimensions. A realistic example of a dense engineering detail drawing.
A3 sheet with title block
A full A3 border with a completed title block, sheet grid references and a dimensioned cover-plate drawing inside the frame. Useful for checking how a complete drawing sheet scales to fit.
18-tooth spur gear
A binary STL of an extruded 18-tooth spur gear with a centre bore. The highest-polygon sample here, so it is the best test of 3D orbit performance.
25 mm calibration cube
The standard 25 mm calibration cube used to check 3D printer dimensional accuracy. The smallest valid binary STL on this page.
L-bracket
A Wavefront OBJ of a simple two-flange L-bracket. Plain-text geometry, so it is also useful for seeing what an OBJ file looks like inside.
Minimal floor plan
A deliberately tiny DXF containing only an ENTITIES section. Useful for testing that a parser copes with a file that has no header or layer table.
Minimal bracket
The smallest useful DXF on this page. A handful of lines and one circle, with no header or tables.
What these files are for
They are useful in three situations. If you are evaluating a viewer or converter, you need a file whose contents you already know. If you are testing your own CAD software, you need clean, small, valid files that isolate one feature at a time. And if you are learning a format, a small ASCII DXF or OBJ is the fastest way to see how it is actually structured — open one in a text editor alongside the viewer.
Every DXF here is written as AutoCAD R12 (AC1009) with a HEADER, a LAYER table and an ENTITIES section, which is the most widely readable DXF flavour. The STL files are binary, and the OBJ is plain text.
Frequently Asked Questions
Are these real CAD files or just pictures?
They are real, parseable CAD files. Each DXF contains genuine geometry on named layers, and opening one gives you a working layer list, selectable entities and measurable dimensions.
Can I use them to test my own software?
Yes. They are deliberately small and clean, and each one exercises a different feature: layers, arcs and circles, dense text, large coordinate ranges, or high polygon counts.
Do you have a sample DWG file?
Not yet. DWG is a closed binary format, so a hand-written sample would not be representative. The DXF files here carry the same geometry and open in every CAD application, including AutoCAD. You can still open your own DWG files in the viewer.
Why is the calibration cube so small?
A cube needs only twelve triangles, and binary STL stores fifty bytes per triangle. That makes it the smallest possible valid mesh — useful for checking that a parser handles a minimal file correctly.
Can I open these on a phone?
Yes. The viewer runs in any modern mobile browser, and every file on this page is small enough to open instantly over a mobile connection.