A container sized to exactly what it holds. Real CAD bottle threads with FDM clearance compensation — not a mesh someone scaled in a slicer.
Validated watertight STLs · thread engagement verified by phase-scan · no login, no cost
Set the inner diameter and depth to the thing you're storing — SD cards, hardware, spices, paint. The generator derives the lid and threads automatically.
Jar and lid come as separate STLs. Both print open-side up with no supports — the trapezoidal thread profile is self-supporting by design.
PETG or PLA, 0.2mm layers, 3 perimeters. The default 0.3mm thread clearance fits most printers; if the lid binds, regenerate with clearance at 0.4–0.5mm.
Yes — when they're designed for FDM. This generator uses a coarse trapezoidal bottle-thread profile (like a soda bottle, not a machine screw): wide pitch, shallow flank angles, and a clearance offset baked into the lid. Fine machine threads fail on FDM printers; bottle threads thrive.
One parameter: clearance. It offsets the lid's thread radially and axially from the jar's. Too tight → raise it by 0.1mm and regenerate. Too loose or wobbly → lower it. Once you find your printer's number it stays valid for every size you generate.
The printed parts are solid and the threads seal well against dust and spills, but FDM layer lines are not guaranteed waterproof. For dry goods it's excellent; for liquids, add an O-ring groove in the PrintMakerAI editor or print in PETG with higher flow.
The free generator clamps at 80mm inner diameter and 100mm depth to keep server builds fast. For larger containers — or ones with custom compartments, labels, or hinges — describe what you need in the PrintMakerAI editor.
Completely. The geometry is generated by a pre-validated parametric script on real CAD (CadQuery on OpenCASCADE) — no AI tokens, no login, no watermark.
The free generator covers one shape well. For everything else — divided trays, latching lids, embossed text — describe it in the PrintMakerAI editor and get real parametric CAD back. Not sure of a dimension? The free measuring kit reads it off the part.
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