Internal geometry — X-ray
See-through internal view. Left: fluid footprint in plan, true scale (teal); ports show as the wider circles. Right: isometric of the internal void, vertical z exaggerated 3× for visibility. The exterior is an opaque solid block — this is what is inside it.
Download: PNG (x-ray)
Longitudinal section & exterior
Longitudinal section at y=0 (left): grey = solid, white = channel + bores. Exterior isometric (right): the outside of the CAD model, drawn opaque. Click either for full resolution.
Download: PNG (section) · PNG (top) · PNG (iso)
Description
A single monolithic block for resin SLA with one straight rectangular channel 100 µm deep × 2910 µm wide, running the full 18.0 mm port-to-port at mid-height, a solid floor below and ceiling above, and two Ø1.5 mm vertical access bores to the top surface. The vendor part is a sealed polymer body carrying 8 identical parallel channels — this reproduces ONE of them, in a different physical construction. Footprint 22.5 × 5.91 × 1.9 mm.
This models one channel of 8. The microfluidic ChipShop part is a flow cell carrying 8 identical parallel channels. The vendor publishes the channel cross-section and length but no channel pitch and no chip outline, so reproducing the array would mean inventing the spacing. One channel is modelled at the vendor’s exact dimensions instead.
Verification
| metric | value |
|---|---|
| Channel cross-section (H × W) — vendor | 100 × 2910 µm |
| Channel length — vendor | 18.0 mm |
| Channels on the vendor part | 8 identical parallel — one reproduced here |
| Footprint (L × W × H) — OUR design | 22.5 × 5.91 × 1.9 mm OUR DESIGN |
| Channel volume — analytic (nominal) | 5.2380 µL |
| Channel volume — vendor nominal | 5.0 µl published — our analytic is 5.238 µL (+4.76%), consistent at the one significant figure the vendor quotes |
| Channel volume — measured on the model's mesh | 5.3544 µL |
| Δ (mesh − analytic) | +2.22% — uniform 0.4 mm boolean overrun; cross-section exact |
| Void watertight | True |
| Void connected bodies | 1 — bore→channel→bore continuous |
| Chip watertight | True |
| Chip Euler number | 0 — genus-1: one cavity, two vents |
| Min feature vs Phrozen 12K X (px_min = 100/19) | 5.26 px |
| Min feature vs Phrozen 12K Y (px_min = 100/24) | 4.17 px |
| Min feature vs BYU Nordin (px_min = 100/7.6) | 13.16 px |
All geometry checks run with trimesh (merged vertices) on the exported STLs. See the bundled README for the full method.
Source & print adaptation
Source dimensions are what the originating design publishes; ours are what our CAD model is drawn at. Where the two are the same number, no feature was resized to print. No public URL for the source is on record in this repository, so it is cited as plain text rather than linked.
Provenance & caveats
Vendor-attributed: channel cross-section H × W, channel length (18.0 mm), and the 8-channel count (product page). OUR design (not the vendor’s): the chip footprint. One channel of many: the vendor part carries 8 identical parallel channels; this models ONE. The vendor publishes no channel pitch and no chip outline, so an 8-channel copy would require inventing the spacing. Ports are simplified straight cylindrical bores, standing in for the vendor’s MFCS Mini Luer sockets. Printability: px_min = 5.26 px in X and 4.17 px in Y on the Phrozen Sonic Mighty 12K (19 × 24 µm), and 13.16 px on the BYU Nordin printer (7.6 µm/px). These are pixel counts; for the process limits on record for each printer, see Hardware and process. Status — Phrozen Sonic Mighty 12K design, checked in CAD: the geometry is watertight and volumetrically checked in CAD — see the Verification table above for the numbers.
Files to download
- SCAD
channelchip_f431.scad10.0 KBDownload - STL
channelchip_f431.stl207.2 KBDownload - STL
void_channelchip_f431.stl202.8 KBDownloadFor inspection, not for printing: the fluid network, every space that holds liquid, as a solid. - PNG
channelchip_f431_xray.png159.9 KBDownload - PNG
channelchip_f431_section.png22.3 KBDownload - MD
README.md1.8 KBDownload