Three-valve peristaltic pump, larger middle chamber
The same three-chamber pump, but the middle chamber is twice the diameter of the two either side. It also uses a wider liquid channel and a different layer stack from the even-chamber pumps.
What it is for. Displacing a larger volume per cycle than three equal chambers of the outer size would, while keeping the small chambers at each end as the valves.
Variants
Sizes below are given in px: units of the design grid these parts were drawn on, where one unit is 0.0076 mm. That is not the printer's pixel. The printer has its own, different pixel size, and nothing on this page is expressed in it — see Hardware and process.
pump_20_40_20px_0
H.R.3.3 design
| Footprint | 320 × 165 px |
|---|---|
| Membrane thickness | 0.6 layers |
| Fluid chamber height | 3.1 layers |
| Air chamber height | 4 layers |
| Channel cross-section | 14 px × 10 layers |
| Ports | 1 fluid in, 1 fluid out, 3 air in, 3 air out |
| Layout grid | 0.0076 mm per px |