Custom box dieline guide for new brands

Red lines (or solid black outlines, depending on the printer's convention): trim cuts. The die-cutter slices the paperboard along these lines. The shape inside the trim line becomes your box.

Blue lines (or dashed lines): scores. The die-cutter creases the paperboard along these lines so it folds cleanly without cracking. Scores are required wherever the box folds — bottom flaps, side walls, top tucks.

Green or grey lines: glue tabs and flaps. These are the surfaces that get glued to other surfaces when the box is assembled. Glue tabs are usually narrow rectangles on the edge of a side panel.

Dashed or dotted lines (when used distinctly from scores): perforations. The die-cutter perforates without fully cutting, so the customer can tear open a tab or remove a tear-strip on opening.

Sometimes you'll see a separate layer or color for: window cuts (a clear PET film insert), embossing/debossing regions, foil-stamp regions, and varnish/gloss regions. These are usually called out as named layers in the PDF — 'Foil', 'Spot UV', 'Window'.

Red = cut, blue = score, green = glue, dashed = perforation. Confirm your printer's exact color code before designing — conventions vary.

Bleed: extend your background artwork 1/8 in past every trim line (red line). Solid background colors that stop exactly at the trim will print with white slivers because of die-cut tolerance (±1/32 in).

Safe zone: keep all text, brand marks, and important graphic elements 1/8 in inside every trim line and 1/4 in inside every score line. Type that sits exactly on a score will crack when the box folds. Type that sits exactly on a trim will get clipped if the die drifts.

Glue tabs: don't put critical artwork on glue tabs. The glue tab folds inside and gets covered by adhesive — anything printed there will be hidden or smudged. Leave glue tabs blank or print only a brand color background for visual continuity if the tab edge shows.

Window cuts: if your dieline has a window cut, the artwork over the window should be transparent — that's where the clear PET film insert sits and the product shows through. If your artwork has a colored fill over the window cut, the printer will print the color, the die-cutter will then cut through it, and you've wasted that area.

Mistake one: artwork extends past the trim with no bleed, or stops at the trim line. Solid backgrounds need 1/8 in bleed on every side. Vector artwork that mathematically ends at the trim line will print white at the edges due to die-cut drift.

Mistake two: text on score lines or glue tabs. Type that sits on a score line will crack when the box folds — the laminate face stretches and breaks. Type on glue tabs disappears under adhesive. Always check that body copy and brand marks are inside the safe zone.

Mistake three: artwork rotated for the closed-box view, not the flat dieline view. The dieline is a flat layout — when the box folds up, panels rotate. If you design for the assembled-box view ('the front of the box looks like this'), your artwork will be wrong-side-up on certain panels when flattened. Always lay artwork on the printer's dieline file, not on a mockup.

Mistake four: window cuts without artwork transparency. As described above — fill the window-cut region with no print color (or set as cut-through layer), not a solid fill.

Mistake five: ignoring the inside of the box. Custom-printed inside surfaces (interior print) cost extra but they're often skipped by founders, then customers post unboxings showing plain raw paperboard inside. Decide whether you're printing inside or not, and tell the printer.

Stock dielines are pre-existing dielines that printers already have set up for common box sizes — tuck-end cartons in 3×3×4, 4×4×6, 5×3×8, 5×5×5, and dozens more. Using a stock dieline means no die charge, faster turnaround, and lower minimum-order quantities (usually 50-100 piece minimums vs 500+ for custom dies).

Custom dielines are required when you need a non-standard shape — a hexagonal carton, an unusually proportioned box, a sleeve-and-tray combo, or a magnetic-close gift box. Custom dielines carry a one-time die charge and a 500-piece minimum on the first run.

Tactical advice for new brands: launch on a stock dieline for SKUs one through three. Validate the product, the brand, the SKU velocity. If a particular SKU justifies the investment after the first 5,000 units are sold, then commission a custom dieline for that SKU only. Don't pay for custom tooling on launch SKUs that may or may not survive product-market-fit.

If you're using a stock dieline, you don't need a structural designer. The printer's dieline file is ready; you only need a graphic designer to lay your brand artwork on top. Most graphic designers can handle this with 30 minutes of guidance from the printer.

If you need a custom dieline — a unique shape, a complex sleeve-and-tray, a magnetic-close box, a unique closure mechanism — you may need a structural packaging designer. Cost depends on complexity. The deliverable is a vector dieline file (AI or PDF) you can hand to any printer for production.

Many printers (Bazaar included) have an in-house structural team that will design a custom dieline for free or low-cost if you commit to running production with them. We do this regularly — a founder shows us a sketch or a reference photo, we mock up the dieline, send it back, run a single-piece sample, then go to production. No design fee if the project is going to press with us.

Always get a physical sample (a 'press proof' or 'die proof') before approving the full run on a custom dieline. A physical sample takes 2-5 business days and lets you hold the actual folded box in your hands before you commit to thousands of units.

What to check on the physical sample: does the box close cleanly? Does the score crack on the corners after a few open-close cycles? Does the artwork align across panels after assembly (a common dieline-translation issue)? Does the box stack flat for shipping and assemble in under 10 seconds?

Some printers (including Bazaar) offer a CAD render or a 3D mockup before the physical sample — a digital preview that catches gross artwork issues in minutes. The CAD render is free. The physical sample is the final check.

Bazaar Printing has stock dielines for over 40 common folding-carton shapes, with no die charge and 50-piece minimums. For custom dielines, our in-house structural team designs new dies free of charge if you're running production with us. We send a CAD 3D render before physical proof, and a physical proof before press, so you can validate the structure twice before committing to a full run.

If you have a reference image from another brand and you want to spec a similar structure, send the reference — we'll quote the closest match in our stock library or design a custom dieline that hits the visual you want.