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Materials & Alloys Post-ProcessingFree tool · No signup · Runs in your browser
Free DFM Checker
Drop in an STL or STEP file and get an instant Design-for-Manufacturing report for 3D printing — size, wall and feature limits, overhangs, slenderness and tolerance risk, with fixes. Your file is analyzed on your device and never uploaded.
- Scores FDM, SLA, SLS and MJF from one upload, so you can see which process suits the part
- 3D preview with overhangs highlighted
- Built on the same engine that drives our quotes
Drop your STL or STEP file
or click to browse
Choose file.stl · .step · .stp · nothing leaves your browser
Your DFM Report
File: — ·
Pick a process and material — your report appears here.
How the DFM Checker works
Three steps, a few seconds, no account. The geometry is read and scored entirely on your device.
Upload
Drag in an STL or STEP file. Parsing and analysis happen in your browser — nothing is uploaded to us.
Configure
Choose the process (FDM, SLA, SLS, MJF) and material. The report re-scores instantly as you change options.
Review
Get a 0–100 score, every flagged issue with measured-vs-limit detail, and the top actions to fix it.
What gets checked
Process-specific thresholds across geometry, process, material and tolerance. A few of the headline checks:
Build envelope
Flags parts that exceed our preferred and maximum build sizes so you can split or re-orient early.
Minimum features
Estimates the smallest features and walls and compares them to the process minimums (STL only).
Overhangs & supports
Measures down-facing surface area that needs support and highlights it on the 3D model.
Slenderness & warp
Catches tall, thin geometry and material-specific warp risk (for example wide, flat ABS or ASA).
Your file never leaves your browser
STL parsing, STEP tessellation (via WebAssembly), and every DFM check run locally on your device. We don't upload, store, or see your geometry. Bring it here before you share it anywhere.
DFM Checker FAQ
Design for Manufacturing review checks a part's geometry against the realities of a process before you build it — size limits, minimum feature and wall sizes, overhangs that need support, slender sections that can warp or break, and tolerance risk. This tool flags those issues and recommends fixes.
STL and STEP (.stl, .step, .stp). STL is analyzed for size, features, overhangs and complexity. STEP is analyzed for size, slenderness and overhangs — upload an STL for fine-feature checks.
No. The entire analysis runs locally in your browser using WebAssembly and JavaScript. Your geometry is never uploaded, stored, or transmitted.
No. The checker is an automated first pass using the same scoring engine as our quoting system. Every order still gets a human manufacturing review before it runs. Use the score to catch obvious issues early.
Your model is measured against published design limits for each process — minimum wall thickness, trapped material, hole and gap sizes, build envelope and more. The score is set by the single worst feature, because that is what actually limits whether a part can be made, and the report always names it: "82, limited by minimum wall thickness: 0.9 mm against a 1.0 mm preferred and 0.6 mm hard limit." You can check the arithmetic yourself from those three numbers. We also show how many of each process's published rules we were able to check, rather than implying we checked them all.
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