AI Model Print-Readiness Checklist

What it helps you decide

Which of your model’s problems to fix before slicing, and whether it is worth printing at all. The figures below are examples from specific printers and processes, not universal rules.

The checklist

1. Solid and manifold. Prusa’s guidance: the model must be solid; for multi-material every part must be manifold. The 3MF core specification states each triangle edge must be shared with exactly one other triangle for solid meshes, with consistent orientation and outward normals. Pass: your repair tool reports no non-manifold edges. Blender’s 3D Print Toolbox (an extension, version 1.5.0 dated 2026-10-19, needs Blender 4.2 LTS or newer) lists Analyze and Make Manifold features; older manual text names Solid, Thickness, Distorted and Overhang checks, so confirm panel names in your install.
2. Wall thickness against your process. Prusa’s table for a 0.4 mm nozzle: one perimeter is about 0.45 mm, two about 0.9 mm, three about 1.35 mm, four about 1.8 mm; walls thinner than one perimeter will not print. Formlabs’ Form 3/3B specification at 100 micron Clear Resin lists minimum supported and unsupported walls of 0.2 mm, minimum embossed detail 0.1 mm and engraved detail 0.15 mm. Pass: every wall is above your process minimum. Other printers and resins differ.
3. Overhangs and supports. Prusa: overhangs of about 45 to 60 degrees print cleanly, up to 75 degrees on MK4S/CORE One class printers. Formlabs Form 3: maximum unsupported overhang length 5.0 mm. Pass: overhangs inside your printer’s range, or supports planned.
4. Holes, clearance and drainage. Formlabs Form 3: minimum hole 0.5 mm and minimum clearance 0.5 mm; a drain hole of at least 2.5 mm is needed for enclosed cavities. For movable parts such as hinges, Prusa suggests at least 0.3 mm of clearance and says the right value needs refining with test prints. For hollowed resin models Formlabs advises at least one drain hole near the build platform and checking Cups in PreForm’s Print Validation. Pass: all holes, clearances and drain holes meet your process figures.
5. Scale and units. STL specifies no units; 3MF has a unit attribute with millimeter as the default. Pass: dimensions checked in the slicer against the real-world size you want.
6. Format and color. STL has no standard color or texture. In 3MF, displaycolor in the core spec is for rendering only; printed color intent needs the Materials and Properties extension. Pass: the format you export carries what you need, and your slicer is known to read it (slicer-specific 3MF color behavior is not confirmed in our sources).
7. Repair path. PrusaSlicer repairs “to a degree” automatically. OrcaSlicer merged a rewrite of Fix Model on 2026-10-13 (author states GUI paths and Linux/macOS builds were not tested; whether a tagged release contains it is unchecked). Bambu Studio’s official wiki is not readable; a maintainer comment from 2023 describes its repair as limited. Pass: repair done, then re-analyze, since repair can fill holes without making a good shape.
8. Slice and inspect. Open the sliced layers and look at thin features, floating islands and unsupported bridges before you print.

A worked example by hand

Imagine an AI-generated figurine mesh for a 0.4 mm nozzle printer. The measurements in this example are hypothetical, not from a real model. Suppose the mesh analysis reports non-manifold edges: fail on item 1, so you repair and re-analyze. A scabbard wall measures 0.3 mm in the slicer: below one perimeter (0.45 mm), so it will not print as is; thicken it, or pick a process with smaller features. A sword tip overhangs at about 80 degrees (assumed): outside the 45 to 60 clean range, so plan supports. You export 3MF and keep millimeter units, then check the size in the slicer. Each step compares a measured value with a published figure; the figures and the measurements are yours to confirm for your printer.

Limits

Prusa’s pages carry no date. Formlabs’ figures are for one printer and one resin at one layer height, and the Formlabs hollowing article is undated; its example saving applies to that case only. We found no official minimums for Bambu, Orca, Chitubox, Lychee or other resin makers. Whether a given AI mesh prints is not predicted by this list; we have not measured that, and print-readiness beyond the slicer shows how to check your own files. For repair steps see fixing an AI model for the slicer; for resin minis, AI miniatures for tabletop resin; for color, 3MF and multicolor. If you plan to sell prints, read selling 3D prints of AI models. More under printing.

See also the AI 3D planning tools hub.