OMTech Spectra UV Printer: What Can You Actually Print On? A Materials Guide

Quick answer: The Spectra A3+ prints on over 300 materials — acrylic, wood, metal, glass, ceramics, leather, canvas, PVC, and cardboard — using six ink channels (CMYK + double white + varnish) that let it print full color, opaque white on dark or clear surfaces, and localized gloss texture up to 5mm in a single pass. It comes in single-head ($3,199) and dual-head ($4,499) configurations; the dual-head runs nearly twice the production output and handles white ink layering more effectively.

Table of Contents

• What "UV Printer" Actually Means
• The Six Ink Channels
• Material-by-Material Guide
• Where Adhesion Testing Actually Matters
• Single-Head vs. Dual-Head
• Frequently Asked Questions

What "UV Printer" Actually Means

A UV printer sprays ink directly onto an object's surface and cures it instantly with UV light, rather than printing on paper or transfer material and applying it separately. That's what makes direct printing on acrylic, wood, metal, and glass possible — the ink bonds and cures right on the material itself.

The Six Ink Channels

The Spectra A3+ runs CMYK + double-white (WW) + varnish (V) — six channels total. The double-white configuration is what enables vibrant, opaque white printing on dark or transparent materials in the same pass as full color, rather than requiring a separate print run. The varnish channel applies localized gloss coating to specific parts of a design rather than the whole surface, and can also build up layered 3D texture up to 5mm.

Material-by-Material Guide

Maximum media height is 5.5" (140mm), so the material list extends beyond flat sheets to assembled gift boxes, thick tiles, and pre-assembled product samples — anything that fits within that height envelope.

Where Adhesion Testing Actually Matters

Across UV printing generally — not specific to any one brand of printer — glass and untreated metal are the two materials most likely to cause adhesion problems, and it's worth understanding why before you commit a production run to either. Glass and stainless steel both have low surface tension, which means standard UV inks don't bond well without some form of surface treatment (a primer coat, plasma treatment, or corona discharge). Float glass in particular has a "tin side" from the manufacturing process that resists ink adhesion even after curing looks fine on the surface — prints can peel later under cleaning or handling stress that wasn't apparent right after printing.

The standard practice across the UV printing industry, and the one worth following here: print a small sample on the exact material and finish you plan to use, clean it the way you would in normal production, let the cure fully settle, and test adhesion — ideally with a light scratch or tape-pull test — before committing to a full run. This applies whether you're printing glass coasters, metal awards, or ceramic tiles; it's a property of the material's surface chemistry, not a limitation specific to any particular printer.

Single-Head vs. Dual-Head

Both configurations use the same Epson F1080 printhead technology and CMYKWW+V channel setup.

"The decision between single head and dual head generally depends on whether you want to use white ink, whether varnish and gloss effects are part of the product value, and the required print size," says Shishir Nigam, Founder of The Maker's Chest. "Having a dual head roughly doubles the output and allows you to handle concurrent white, color, and varnish more effectively."

For a shop that mostly prints straightforward color designs on light-colored materials without gloss effects, single-head is usually sufficient. For anyone regularly layering white ink under color, adding varnish texture, or printing at production volume, the dual-head's near-doubled output and better concurrent-channel handling justify the $1,300 price difference.

Frequently Asked Questions

Can the Spectra print on dark or clear materials without looking washed out?

Yes — that's specifically what the double-white ink channels are for. White ink prints underneath the color layer as an opaque foundation, which is what makes color vibrant on dark wood or clear acrylic instead of translucent and faded-looking.

Why do glass and metal need testing before a full production run?

Both have low surface tension, which resists standard UV ink adhesion without treatment. This is a property of the material itself, seen across UV printing generally — a small test print, cleaned and cured the way production pieces will be, is the standard way to confirm adhesion before committing a batch.

Can I combine laser-cut shapes with UV printing?

Yes — this is one of the more commercially valuable workflows OMTech highlights: cut a shape on a laser, then UV print full-color graphics, white ink, and spot gloss onto it, producing a finished product neither machine could deliver alone.

Is single-head enough for a small side business, or should I start with dual-head?

It comes down to whether white ink, varnish effects, and print volume are core to your product line from day one. If they are, dual-head's near-doubled output and better concurrent channel handling pay for themselves faster; if not, single-head covers most straightforward color-printing needs.

Have questions about which UV printer configuration fits your product line? Contact The Maker's Chest — we'll help you match the machine to the job.

Written By

Alina Oprea

Maker & Equipment Specialist

Alina Oprea is a hands-on maker, jeweler, and workshop specialist at The Maker’s Chest, with 25 years of silversmithing experience alongside a background in woodworking, renovations, construction, and commercial ductwork installation.

Her experience spans decorative woodwork, hand-carved doors, jewelry fabrication, homebuilding with Habitat, and real jobsite problem-solving — giving her a practical understanding of materials, tools, workflow, and what machines need to deliver beyond the spec sheet.