Export Perforated Patterns to SolidWorks / Fusion 360 as STEP Files
Modeling a hole pattern directly in CAD is slow in a way every mechanical engineer knows: sketch one hole, run a linear or circular pattern, wait for the rebuild, discover the spacing looks wrong, and start over. Gradients make it worse — most CAD pattern features can't vary hole size across a surface at all. The faster workflow is to design the pattern parametrically in the browser, then hand your CAD software a finished STEP file. This guide walks through that workflow with SolidVents, including how to keep imports fast when the pattern has thousands of holes.
Split STEP export in action: a dense pattern divided into regions that align automatically when imported into CAD.
The pattern-to-STEP workflow, step by step
1 Design the pattern in your browser
Open the generator that matches your part — the speaker grille generator for audio panels, the ventilation hole generator for cooling openings, or the halftone generator for decorative perforation. Build the pattern with sliders and control points: array mode (grid, hex, concentric, spiral…), hole size and spacing, size gradients, and a boundary shape to clip the pattern to your panel outline. What takes an afternoon of pattern features in CAD takes minutes here.
2 Check the pattern at manufacturing scale
Before exporting, sanity-check the numbers against the real part: smallest hole diameter, minimum web (the material between adjacent holes), and the boundary dimensions. The exported geometry comes in at the scale you designed, so catching a too-small hole here is much cheaper than re-importing later. If you're designing for acoustics or airflow, this is also the moment to eyeball the open area — our speaker grille design guide covers the guideline numbers.
3 Export a STEP (.stp) file
Pick STEP in the export menu and download the file. STEP is the neutral 3D exchange format of the CAD world — unlike a mesh (STL) it carries exact analytic geometry, so circles stay true circles instead of polygon approximations. The free plan includes 3 exports per day; Pro removes the limit.
4 Import into SolidWorks, Fusion 360, or any CAD
In SolidWorks, use File → Open and select the .stp file; in Fusion 360, upload it to your project or use Insert → Insert CAD. The pattern arrives as exact surface geometry. From there, the usual moves are to thicken it into a solid panel, or use it as the cutting geometry to perforate an existing body. Because the geometry is exact, downstream features — fillets, shells, drafts — behave just like native geometry.
5 Dense pattern? Use split STEP export
A grille with thousands of holes can make any CAD import crawl — one giant face with thousands of inner loops is heavy to parse and heavier to rebuild. The STP Split feature (Pro) solves this by dividing the surface into a grid of smaller regions — you choose the rows and columns — exported as separate STEP files, optionally packaged as one ZIP. Every piece keeps absolute coordinates, so when you import them into the same CAD assembly they align precisely with zero manual positioning.
Why STEP instead of DXF or STL?
Each format has a job. DXF is 2D — perfect for laser cutting and AutoCAD drawings, but your CAD model then needs an extrude-and-cut rebuild. STL is a triangle mesh — fine for direct 3D printing, useless for precise engineering because every circle becomes a polygon. STEP is the only one of the three that hands your CAD system exact, manufacturable 3D geometry it can treat as first-class: measure it, reference it, cut with it, thicken it.
SolidVents exports all three from the same design, which is the point: one parametric pattern, a 2D vector path for the graphics and laser-cut route, and a 3D STEP for the engineering route. No redrawing between tools.
Frequently asked questions
Which CAD software can open the exported STEP files?expand_more
STEP (.stp) is a neutral 3D exchange format, so the files open natively in SolidWorks, Fusion 360, CATIA, Inventor, Rhino, FreeCAD, and virtually every other CAD package.
Is STEP export free?expand_more
Yes — the free plan includes STEP, SVG, and DXF export, up to 3 exports per day. The Pro plan removes the daily limit and adds split STEP export for very dense patterns.
My CAD freezes importing thousands of holes. What can I do?expand_more
Use the STP Split feature: it divides the surface into a grid of smaller regions exported as separate STEP files (optionally zipped). Each file keeps absolute coordinates, so the pieces align automatically in CAD — import them one by one to keep your session responsive.
Can the holes still be edited after importing into CAD?expand_more
STEP carries exact geometry, not feature history, so you edit the pattern parametrically in SolidVents — adjust the sliders, re-export, and re-import. Cloud-saved projects make this round trip quick.
Do you also export 2D formats for laser cutting?expand_more
Yes. The same pattern exports as SVG for graphic tools and laser cutters, or DXF for AutoCAD and CNC workflows — one design, 2D and 3D outputs.
Design your hole pattern in minutes, not hours
Free to start, no sign-up. Build the pattern in your browser and export STEP straight into your CAD workflow.