Design for manufacturability, in your browser

Check a part. Choose the process, see what would stop it being made, fix what can be fixed, recheck.

Drop an STL, 3MF or STEP file here

or choose one from your computer

No file yet? Start from a sample part for the process you are making it with.

What is this part, and what matters most? (optional)

Process

Material optional, refine your match

Strength (load bearing) 6

Flexibility 2

Heat resistance 3

Toughness / impact 5

Needs outdoor / UV resistance

Comfortable with

Best matches

Upload an STL, 3MF, or STEP file to run the checks for your selected manufacturing process.

Analysis 0

Ready to review

100

Manufacturing
readiness

Critical

Warnings

Passed

How the score and status are calculated

The status above (Ready to review / Needs attention / Major issues detected) is the primary read: any critical issue means major issues, any other flagged issue means needs attention, nothing flagged means ready to review. The 0-100 score is supporting detail, not a certified measurement: it starts at 100 and each critical issue subtracts 18 points, each high-severity issue 8, each medium 3, each low 1, floored at 0. "Passed" counts the distinct checks relevant to your selected process that found nothing to flag.

Recommendation

Upload a model to see a recommendation.

Suggestions

Flagged locations

Fix the geometry

By default Buildable only refines geometry that is already there: fillets, chamfers, hole tolerancing, draft, countersinks. It never adds a brace, support pillar or wall thickening on its own; allow that below if you want it. Planning a fix sends a bounded summary of these results to Claude (Anthropic), never the file: what is sent, and when.

What is this part, and what matters most?

Allow structural additions braces, supports, wall thickening

Countersink fastener holes for flush screw heads

Sends a bounded summary of these results to Claude (Anthropic), never the file.

How should this be made?

Same geometry, checked against all six processes. Open a row for the evidence behind its status.

What was checked, and what wasn't

0 Geometry alone cannot answer everything; this is what was and was not checked.

Cannot be determined from CAD alone

evaluated, clean evaluated in part not evaluated not answerable from CAD

Detail

Overhang faces

Thin-wall spots

Bridge spans

Triangles

What Buildable automates

⟲Reorients the part to minimize unsupported overhang

◤Softens sharp overhang edges to cut stress risers (a real rounded fillet on STEP models, a flat mesh chamfer otherwise)

◎Compensates fastener holes for FDM shrink (a real concentric re-cut on STEP models)

⬡Adds draft angle for injection molding & casting (STEP models only, a real tilted face)

⬢Carves down overly-thick walls for injection molding & casting (STEP models only, a real cut)

◐Fillets sharp internal corners for CNC tool access (STEP models only, a real rounded fillet)

◒Cuts a countersink for flush screw heads (STEP models only, opt-in, a real conical cut)

⬇STEP models with a real CAD-kernel edit can be exported back to STEP

◫Multi-part STEP assemblies get real interference detection and an exploded view

▭Welds a support pillar under unsupported bridges (opt-in, a real boolean fuse on STEP models)

▮Thickens walls measured under your safe minimum (opt-in, a real welded boss on STEP models)

▲Adds a brace/gusset to fix tip-over risk (opt-in, a real boolean fuse on STEP models)

Upload a STEP file containing multiple solid parts to see real interference detection and an exploded view. A single-part model won't show anything here.

A real multi-part STEP where two of the parts genuinely overlap. The overlap is measured as a boolean intersection by the CAD kernel, not estimated from bounding boxes.

What Buildable checks depends on the manufacturing process selected above. Every process below gets at least a basic pass; FDM and SLA have the deepest check coverage today. Reorienting for overhang runs on one click; bracing, wall thickening and support additions are opt-in, because they add material rather than refine what is there.

Condensed from Bambu Lab's print-quality wiki. Four of these Buildable can catch before you slice; overhangs fix automatically with a reorient or chamfer, while bridging, thin walls, and tip-over need a structural addition, so those only fix when you enable "Allow structural additions" in Auto-fix. The rest come from your slicer, printer, or filament, so we can only flag you're headed toward one.

Buildable checks and auto-fixes these

OverhangsAuto-fix: reduces, rarely clears

A steep unsupported face has nothing beneath each new layer to bond to, so it droops or sags as it prints. Buildable flags any face past your overhang-angle threshold, highlighted amber. One-click reorientation searches every sensible orientation and keeps the best one. It REDUCES overhang rather than removing it: on Buildable's own FDM sample it takes the overhang area from 1,360.2 to 872.6 mm² at the default 45° threshold, a 36% drop, and the recheck says so rather than calling the part fixed. Reorienting also cannot help a thin wall or a bridge, because it moves the part without changing it. A real rounded fillet on STEP models (a flat mesh chamfer otherwise) cuts the stress concentration where reorienting alone can't.

BridgingOpt-in fix

A flat span with no support underneath it sags mid-air or snaps as the nozzle tries to print straight across the gap. Buildable flags any span longer than about 8mm, highlighted violet. It can weld a thin support pillar from the build plate up to the span, but only when you enable "Allow structural additions" in Auto-fix, since that adds new material Buildable itself chooses the shape of.

Thin wallsOpt-in fix

A wall thinner than your nozzle's two-perimeter minimum comes out fused into a single weak line, or gets skipped by the slicer entirely. Buildable flags anything under your minimum, highlighted pink. It can thicken the local patch, but only with "Allow structural additions" enabled, the same opt-in as bridging and tip-over.

Tip-over / poor bed contactOpt-in fix

A tall model on a small footprint has less bed adhesion holding it down, and a higher center of gravity for the print head or cooling fans to knock loose. Buildable warns past roughly a 4:1 height-to-footprint ratio. It can weld a brace down to the base with "Allow structural additions" enabled; by default it only flags the risk.

Print-process issues to watch for

First layer not stickingSlicer / printer

Usually bed leveling, temperature, or a dirty plate. Enable a brim, re-level the bed, and make sure the "plate type" selected in your slicer matches the plate you have installed.

Warping or lifting cornersSlicer / printer

Shrinkage as the print cools pulls its corners off the plate, worse on large flat bases, high infill, and high-shrink filaments like ABS, ASA, PC, and PA. Raise bed temperature, close any enclosure doors, and watch out for large, high-infill, flat-bottomed models.

Extruder or nozzle clogsSlicer / printer

Filament jams from excess chamber heat softening it in the gears, or debris building up inside the nozzle over time. Keep chamber temperature in range for your filament and clean the nozzle periodically, especially after abrasive (carbon/glass-filled) filaments.

Stringing, oozing & nozzle stickingSlicer / printer

Damp filament, too-high nozzle temperature, or under-tuned retraction lets melted plastic ooze out and trail between parts of the print. Dry your filament before printing, and tune retraction distance/speed in your slicer.

Under-extrusionSlicer / printer

Not enough filament reaching the nozzle: a partial clog, bad flow-rate calibration, or filament that can't melt fast enough at your chosen speed. Run a flow-rate calibration and reduce print speed for filaments prone to this.

Gloss/pattern inconsistenciesSlicer / printer

Uneven sheen, "belt pattern" banding, or top-layer gaps mostly come from speed or temperature changing mid-print, or mechanical resonance from the belts. Keep outer-wall speed consistent and double-check flow-rate calibration.

Interlayer crackingSlicer / material

Weak bonding between layers from printing too fast or too cold, or from excessive cooling. Common on ABS, ASA, PC, and carbon-fiber-filled filaments. The Materials tab flags heat-resistant, high-shrink materials so you go in expecting to tune cooling and speed.

SeamsSlicer

A normal artifact where each layer's outline starts and stops, more visible on smooth, curved surfaces. Try more wall loops, or "Spiral vase" mode in your slicer for simple, single-wall parts.

Draft angle and wall uniformity are working checks that auto-fix on STEP models via a real CAD-kernel edit. Undercut detection is new: a more fundamental check than draft angle, since an undercut means the part can't be pulled from a straight two-piece mold at all, no matter how much draft the rest of it has.

Buildable checks these

Draft angleAuto-fix attempted (STEP)

A wall running dead-parallel to the mold's pull direction scrapes or sticks as the part is ejected. Buildable flags facets with under ~1° of draft along the pull axis, and on a STEP-derived model can add real draft to a flagged face. The kernel works face by face and refuses a face whose surrounding geometry it can't rebuild, which is common where walls meet ribs, bosses or each other; a refusal is reported as a refusal, never as a fix.

Wall uniformityAuto-fix attempted (STEP)

A section noticeably thicker than the rest of the part cools slower, risking sink marks on the opposite face and warp. Buildable flags spots well above the part's median wall thickness, and on a STEP-derived model can carve the flagged spot back down to size. The fix works within a small patch around the flagged point, so on a boss much thicker than the patch it changes real geometry without necessarily moving the count: Buildable reports which of those happened rather than calling both a fix.

Undercuts✓ Detected

A feature the mold can't pull straight off needs side-action tooling or a redesign, a real cost driver. Buildable casts a grid of rays along the pull axis and counts surface crossings: a simple, moldable shape crosses exactly twice, a re-entrant feature crosses more, catching genuine tunnels, hooks, and overhanging pockets that draft angle alone can't. Not yet auto-fixed; flag these to your moldmaker early.

Mold-process issues to watch for

Gate location & weld linesTooling / process

Where plastic enters the mold affects fill pattern, cosmetic weld lines, and warp. This is a moldmaker/process decision Buildable doesn't have visibility into.

Shares draft angle, wall uniformity, and undercut detection with injection molding, since both are tool-ejection or solidification processes. Draft and wall uniformity auto-fix on STEP models via a real CAD-kernel edit.

Buildable checks these

Draft angleAuto-fix attempted (STEP)

Same as molding: a wall parallel to the pattern's pull direction sticks on removal from the mold or pattern. Buildable flags facets under ~1° of draft, and on a STEP-derived model can add real draft to a flagged face. The kernel works face by face and refuses a face whose surrounding geometry it can't rebuild, so some walls are reported rather than fixed.

Wall uniformityAuto-fix attempted (STEP)

Uneven wall thickness solidifies unevenly, risking shrinkage porosity and hot tears at the transition. Buildable flags spots well above the part's median wall thickness, and on a STEP-derived model can carve the flagged spot back down to size. The fix works within a small patch around the flagged point, so on a boss much thicker than the patch it changes real geometry without necessarily moving the count: Buildable reports which of those happened rather than calling both a fix.

Undercuts✓ Detected

A feature the pattern can't pull straight out of the mold needs a core, a split pattern, or a redesign. Buildable casts rays along the pull axis and counts surface crossings to find genuine re-entrant voids, not just shallow-draft walls. Not yet auto-fixed.

Casting-process issues to watch for

Sharp internal cornersDesign

A sharp internal corner concentrates stress and encourages hot tearing as the casting cools. Add a generous fillet: this overlaps with the CNC tool-access check if the part is also machined after casting.

Ask about this partsends a bounded summary to Claude (Anthropic), never the file