HP DesignJet 20ps

The DesignJet 20ps is an aqueous inkjet wide-format device in HP’s DesignJet line — the same family that has printed the vast majority of architectural and engineering plan sets in this country for years. The “ps” designation historically points to a PostScript-capable configuration, which matters if your workflow leans on PostScript files or proofing rather than plain HP-GL/2 plotting.

The consumable set tells you more than the name does. This machine runs on HP 11, HP 82, and HP 84 ink families, with HP 84 and the HP C5018A printhead handling the imaging side. That’s an older-generation ink architecture — separate printheads and cartridges — not the integrated-cartridge design of current DesignJet plotters. If you’re evaluating a used or installed-base unit, that consumable lineage is your first clue about the machine’s age.

Think about who’s standing at the tray. On the strength of its consumable set and the PostScript configuration, this is a device built for design-office plotting and proofing on coated and gloss stock — note the HP Gloss Proofing White and HP Premium Plus Satin-matt White media in its compatible list. That points toward presentation output and color proofing, not just bond-paper permit sets.

An Auto Duplexer Unit is available as an accessory, which is genuinely useful for double-sided specification books and reports where you don’t want a stack of single-sided sheets landing on a PM’s desk. But I won’t tell you it turns bid-set collation into an unattended overnight job — I don’t have the roll capacity or the speed figures to make that claim.

If you’re a high-volume engineering department cranking D-size and E-size sets against back-to-back deadlines, an older single-roll design like this is a bottleneck waiting to happen — every roll change is a person walking away from their desk. That’s the kind of load where you’d look at a wider, scanner-equipped machine such as the HP DesignJet T918 36-in, which pairs plotting with integrated scanning for as-built and redline capture. Worth noting: that T918 is itself discontinued, so it’s an installed-base comparison, not a fresh-off-the-truck option. Run the two side by side in our compare tool before you commit.

For a small studio doing occasional color proofs and the odd plan set, the 20ps’s proofing-media support is the part that earns its keep.