Is it possible to just write the file data alone using "Print to File?"
Yes!
There is no way to print to file without specifying a page size. The Costco printers don't want a page size to start with -- you select that later 0n. They want a 300 ppi file at the size specified.
PPI is pixels per inch so there is no way you can have the 300 without the inches.
The entire page layout, including borders, is written to the file. What is needed, is to write the file to file with just the image data only. I tried to print to file using borderless prints, but I still get a white border around the data.
You can't possibly select borderless if you are using PTF properly.
1. Go to the the File menu, select Print To ... and File.
2. Enter the print size requires and 300ppi. Choose "Printer (place dot) ... use Printer icc and Print Sharpening" and OK.
3. Now go on the main screen, bottom right click the blue printer icc dot and browse to the Cosco profile required, make sure "Embed icc profiles" at the bottom of the window is ticked and OK.
4. Place your images in the queue with Fit to Page set and the Crop Scissors on (a must!); adjust the print crop as required. Make sure there are no borders set.
5. Print the images and choose the location and file naming as required when prompted, done.
This is covered in the Help-Index-Learn By Example 25a
Hope that gets you on your way,
Terry.