Changelog

Changes worth knowing about: new features, changed defaults, corrected errors. Not typo fixes.

Dates are when the change landed, not when it was released.

2026-08-26

The Luer taper defaults were wrong, and are corrected. The luer and luer-lock port types shipped with a small-end diameter of 3.925 mm, which against a 4.27 mm large end over 7.5 mm is a 4.6 % taper wearing a 6 % label. Both now use 3.82 mm, derived as 4.27 − 0.06 × 7.5, so the geometry matches what it claims. A taper that is nominally 6 % but arithmetically 4.6 % seals on a line contact rather than a cone.

This changes exported geometry. Ports in projects saved before this date keep the values they were saved with — reapply the catalogue fitting, or set the small end to 3.82 mm by hand, to pick up the correction. The shipped counter-flow exchanger example has been updated.

The same change aligned the type defaults with the catalogue parts, so a port left on the defaults is now recognised as the Norm-Ject fitting instead of reading as unrecognised. Luer-lock defaults moved with it: boss 4 → 5 mm, thread major 7.6 → 7.7 mm, pitch 1.27 → 4.7 mm, collar 5 → 5.5 mm.

Two new port types, both male. luer-male grows a 6 % cone off the chip for a female luer to push onto, and barb prints a ridged hose-barb spigot that tubing goes straight over. Until now every port was a socket cut into the chip. See Ports and fittings.

Three new catalogue fittings, all for 0.125“ ID tubing: Male luer barb, Female luer barb, and Integral hose barb. Barb dimensions are editable fields, so other tubing sizes are reachable without a catalogue entry each.

A new design check. port-protrusion measures the wall between the bore and the outside of a male fitting where it is thinnest, and warns when it falls below twice the minimum printable wall.

The catalogue fitting picker is now a drawing. Each entry shows a dimensioned cross-section generated from its own numbers, with a solid view on a second slide — so a socket and a spigot are told apart at a glance rather than by reading.

2026-08-25

This wiki. First publication. Every page derived from the source rather than from memory, with a sourceRefs contract and an audit that fails when a check, a schema field or a keyboard shortcut goes undocumented. See How this wiki is maintained.

Contextual help in the app. Every row in the Design checks panel now carries a Learn more link into the design-check catalogue, and the printer-profile, fluid-dynamics, split-type and export surfaces link to their explanations.

Three surfaces. The app, a landing page, and this wiki, sharing one design token file.

Earlier

The following shipped before this wiki existed. They are recorded here for completeness rather than as a full history.

Starter templates. Seven geometries with previews rendered from their real channel graphs — serpentine, T-junction, Y-junction, herringbone, spiral, gradient generator and flow-focusing droplet generator. Each carries a caveat where its recreation departs from the published device. See Templates.

Real-part port catalogue. Norm-Ject luer slip, Norm-Ject luer lock, and a 1/8“ PVC tubing socket, with dimensions taken from the parts rather than from a nominal table. A port stops claiming to be a catalogue part the moment its geometry is edited away from one. See Ports and fittings.

Export for presentation. A single bundle containing the schematic, the CAD view and the heatmap, plus a composed 16:9 sheet, with vector sources re-emitted at the target DPI rather than resampled. See Export formats.

Guided tour and onboarding. First-run printer setup, and a walkthrough that marks itself seen when it starts rather than when it finishes.

Fluid dynamics. Analytical pressure, Reynolds, velocity, wall shear and residence-time estimates, heat exchange between adjacent streams, consumption planning, and heatmap export. See Fluid dynamics.

Drainage planning. Detection of enclosed cavities, unreachable regions and blind branches, with automatic vent placement. See Draining uncured resin.

Design checks. Thirteen checks across manufacturability, flow feasibility and drainage, none of which block anything.

CAD preview and export. Live solid geometry through manifold-3d, monolithic and two-piece splits, STL and OpenSCAD export.

Channel drawing. Straight and bezier segments, endpoint / grid / angle snapping, dimension markers lofting across connected chains.