Accurate measuring and correct bleed settings are essential for producing professional sublimation prints. Whether you are working with rigid substrates or soft textile-based products, understanding how to measure correctly and apply bleed will help prevent white edges, missed areas and unusable prints.
This sublimation measuring and bleed guide explains how to create print-ready templates using real-world examples, including sublimation phone case inserts and mouse pads. The same principles can be applied to most sublimation blanks.
Why Measuring and Bleed Matter in Sublimation Printing
Sublimation printing relies on heat and pressure to transfer dye into a coated surface. During pressing, substrates may shift, expand or compress. Without sufficient bleed, even perfectly aligned prints can result in visible white edges.
Using proper bleed and safe zones is a core part of professional sublimation artwork preparation and ensures consistent results across production runs.
Understanding Bleed for Sublimation Printing
Bleed is the extra image area added beyond the final product size. This extra coverage ensures full edge saturation even if the transfer shifts slightly during pressing.
- Rigid substrates: Minimal movement → smaller bleed required
- Soft substrates: Compress and expand → larger bleed required
Example 1: Sublimation Phone Case Aluminium Insert
For this example, we will use an aluminium phone case insert designed for an Apple iPhone 15 Pro Max (6.7″). Phone case inserts are rigid substrates, meaning they do not expand during pressing.
Step 1: Measure the Sublimation Blank
Measure the printable aluminium plate from top to bottom and left to right. In this example, the measurements are approximately:
- Width: 75 mm
- Height: 158 mm
Step 2: Calculate Bleed for a Rigid Substrate
Because the insert is rigid, a 2 mm bleed on all sides is sufficient.
- Width: 75 + 2 + 2 = 79 mm
- Height: 158 + 2 + 2 = 162 mm
Your final canvas size for design should be 79 mm × 162 mm.
Creating the Phone Case Template in Your Design Software
In your preferred design program, create a new document using the following settings:
- Canvas size: 79 mm × 162 mm
- Resolution: 300 DPI
- Background: Transparent
Save this file as a reusable template (for example: Apple iPhone 15 Pro Max 6.7). You can now drag artwork into this template and export print-ready files consistently.
Colour Profile Recommendation
If your software allows manual profile selection, use Adobe RGB (1998). This provides a wider colour gamut and converts more reliably to CMYK-based sublimation workflows.
Advanced Phone Case Template Setup
Safe Zones and Bleed Guides
For advanced users, add guidelines 2 mm inside the canvas edges. These guides indicate the area that may be lost if alignment is not perfect.
Avoid placing important elements, text or logos near the edges or camera cut-out area.
Camera Cut-Out Overlay
Create a separate toggleable layer to represent the camera cut-out. This allows you to visually confirm which parts of your design will be removed.
- Camera cut-out size: approximately 42 mm × 42 mm
- Position: approximately 3 mm from the edge
Allowing for bleed, draw the camera shape approximately 5 mm from the canvas edge. Keep this layer hidden when exporting your final print file.
Example 2: Sublimation Mouse Pad
Mouse pads are soft substrates and behave very differently from rigid inserts. During pressing, the foam base compresses and expands, requiring additional bleed.
Step 1: Measure the Mouse Pad
Place the mouse pad flat and measure the printable area:
- Width: 252 mm
- Height: 200 mm
Step 2: Calculate Bleed for a Soft Substrate
For soft products like mouse pads, we recommend a 5 mm bleed on all sides.
- Width: 252 + 5 + 5 = 262 mm
- Height: 200 + 5 + 5 = 210 mm
Your final canvas size should be 262 mm × 210 mm.
Advanced Mouse Pad Template Setup
Edge and Corner Safe Zones
Add guides 5 mm inside the canvas to indicate areas that may be lost if alignment shifts.
Avoid placing critical elements near the outer edges.
Rounded Corner Overlay
Create a toggleable layer that represents the rounded corners of the mouse pad.
- Typical corner radius loss: 5–6 mm
By drawing this shape on a separate layer, you can easily visualise unprintable areas while keeping your final export clean.
Final Thoughts
Correct measuring and bleed setup are foundational skills for successful sublimation printing. By understanding how rigid and soft substrates behave and building accurate templates, you dramatically reduce errors, waste and reprints.