A projector is better if you sew often, cut on a table and want to go from PDF to cut fabric in minutes with no printing, taping or storage. Paper is better if you sew occasionally, carry patterns around, fit on a dress form, or alter patterns heavily by slashing and spreading. Many sewists end up using both: paper for the toile and the fitting, the projector for cutting the final garment.
How do the two compare?
| Feature | Projector | Paper (home print or copy shop) |
|---|---|---|
| Setup cost | A projector, a mount and an afternoon of calibration | None beyond a printer or a copy shop fee |
| Cost per project | Nothing | Ink and paper, or a per-sheet fee |
| Time to the first cut | 5 minutes once calibrated | 30 to 90 minutes for a large pattern |
| Accuracy | Within 1 to 2 mm when calibrated; drifts if the projector moves | Within 1 mm when printed at 100 %; taping adds drift across joins |
| Space | A table under a ceiling or wall mount, used in one place | Anywhere, including the floor and the sofa |
| Fitting and alterations | Done in the file; no pinning a pattern to a body | Slash, spread, pin to a toile, trace a new version |
| Storage | Files on a drive | Bundles, envelopes, rolls |
| Dark and busy fabrics | Harder to see the lines | No difference |
| Learning curve | A few hours of setup and a new way of working | None |
| Reusing a pattern | Open the file again | Trace or re-print |
How does a projector pattern work?
A short-throw projector is mounted above the cutting table, pointing straight down. You calibrate it once with a grid, so that a 5 cm (2 in) square in the file projects as a 5 cm square on the table, then open the pattern's projector file: a single page with no tiling, no margins and a calibration grid. The pieces appear on the fabric at true size. You weight the fabric, trace the lines with chalk or cut directly along them with a rotary cutter, and move the file around on the screen to cut the next piece.
The projector sewing guide covers mounting, calibration and cutting, and setting up a projector on a budget goes through the equipment.
Which is more accurate?
Both are accurate enough for garments when set up with care, and both fail in the same way: a scale error nobody checked.
With paper, the error comes from a print dialog set to "fit to page" or from pages taped a millimeter off at each join. A 2 mm drift over six joins on a trouser leg is 1.2 cm (1/2 in). With a projector, the error comes from a calibration that was good last month and is slightly off now, because the projector was nudged or the table moved. Keystone, the distortion when the projector is not perfectly square to the table, stretches one side of the pattern more than the other.
The remedy is the same: measure the test square every time, on paper or on the table. A projector also lets you check a long measurement, since you can project a 50 cm (20 in) line and lay a tape along it.
Which costs less over time?
Paper costs a little every project and nothing up front. A projector costs a fair amount once and nothing after. The break-even depends on what you sew: someone who prints a 40-page dress every few weeks recovers the cost of an entry-level projector within a year or two in ink, paper and copy shop fees, and sooner if they count the hours taped. Someone who sews four small projects a year never will.
The hidden costs are on both sides. Paper needs a place to store a growing pile, and tape and glue sticks run out. A projector needs a mount, sometimes a longer HDMI cable or a wireless adapter, and a laptop or tablet near the table.
Which is faster?
Once calibrated, a projector is much faster: open the file, weight the fabric, cut. There is no printing, no trimming, no taping and no cutting out of paper pieces before you touch fabric. For a dress that would be 45 pages, that is an hour saved.
Paper is faster only in one case: when the projector is not set up. If you cut on the floor, in a different room each time or in a space where nothing can be mounted, the five minutes of setup becomes thirty, and paper wins.
Which is better for fitting and alterations?
Paper, by a wide margin. A paper pattern can be pinned to a dress form, slashed and spread for a full bust, walked seam against seam, and traced into a corrected copy. With a projector, every change must be made in the file, which means pattern software, or a pattern that redraws itself from your inputs.
That second case is worth knowing about. A made-to-measure pattern is drafted from your measurements, so the bust, waist, hip and lengths are already yours and the usual grading between sizes disappears. You still check shoulders, sleeve width and the back on a toile, and for that a paper print of the toile is the practical medium even if you cut the final garment under a projector. The made-to-measure patterns page explains what the drafting does and does not cover.
Which fabrics favor paper?
Dark fabrics absorb the projected light, so black wool or navy denim show the lines faintly. A brighter projector, dimmed room lights and white chalk help, but some people prefer paper for dark cloth. Shaggy or textured fabrics, such as boucle or faux fur, scatter the light and hide thin lines.
Slippery fabrics are a wash: on paper you pin, under a projector you weight. Projectors are good at placing a motif, because you see the pattern outline over the print of the fabric and can slide the fabric until a flower sits where you want it. Pattern matching with a projector is easier than with opaque paper.
What about seam allowances and markings?
Both media show the same lines: a projector file includes the seam allowance, notches and grainline, as a printed file does. The difference is in marking. On paper you cut the piece, then transfer notches with snips or chalk. Under a projector you mark notches and darts with chalk while the piece is still projected, before you move the fabric, because once it moves the image no longer lines up.
Which should you choose?
- You sew every week on a table that stays put: a projector. The hour saved on each large pattern adds up fast, and you stop storing paper.
- You sew a few times a year: paper. The setup time and cost of a projector are hard to recover, and a copy shop sheet or a home print is fine.
- You fit carefully, with toiles and alterations: paper for the toile and the pattern work, and a projector afterward if you have one.
- You cut on the floor, in shared space or in different rooms: paper, unless a portable floor setup suits you.
- You mostly sew dark, thick or shaggy fabrics: paper, or a projector with a brighter output and a chalk pen.
- You work from made-to-measure patterns with few alterations: a projector fits especially well, because most of the fitting happens before the file is made. Sewly's projector file is one of its output formats alongside A4, Letter, A3, Tabloid and the copy shop sizes, so you can print the toile and project the final.