Bleed and safe space solve different problems
Bleed extends artwork beyond a nominal trim or cut boundary so an edge does not depend on perfect alignment. A safe zone keeps important content away from areas where small variation could make it difficult to read or retain. These are related ideas, but they are not interchangeable. Use the supplier-approved dimensions for the actual cup, including the seam allowance. Do not copy a measurement from an unrelated product or infer it from a photograph of a similar-looking cup.
A taper changes the wrap
The printable surface of a tapered cup is an annular sector rather than an ordinary rectangle. Flat design coordinates, curved placement and the seam need to be considered together. Compare the studio’s views to understand how artwork moves around the object. The current geometry is a planning aid until the supplier confirms it. A convincing three-dimensional preview cannot certify the dieline, material construction or placement tolerance, so keep those acceptance questions distinct from the creative review.
Resolution depends on placed size
An image’s usefulness is not determined by its pixel dimensions alone. The same file placed at a small size and enlarged across a wrap can produce very different effective detail. Avoid substituting a screenshot for a proper source file. Inspect small lettering and fine marks at realistic viewing size. Upload checks can identify obvious problems, but imported PDFs, effects and mixed vector/raster artwork still need appropriate pre-press review for the intended output and production process.
Screen colour is not a print guarantee
RGB display colour and a printer’s CMYK output are different systems. The relevant profile, substrate and process affect the result. Keep approved brand references available and ask the supplier which output profile and proofing method apply. Do not label an arbitrary conversion as printer-approved. This project keeps production release blocked until the required supplier acceptance, ICC profile and independent PDF validation are available. That is separate from whether a sample proof can be generated and reviewed on screen.
Keep the source and the approval together
Retain the original artwork, any font or image permissions and the specific reviewed proof. A later revised PDF should receive its own version and decision. Rasterising a review file can make it safer to display, but it does not turn that file into an approved production master. Check that the final manufacturing artwork corresponds to the version the customer accepted. If the underlying design changes, repeat the relevant review instead of treating an old approval as covering a new document.