Borderless printing - can't set custom paper

Thanks, Bob.

Now that you say it, I think that's what happened when I started using the printer on my Mac, but it was 3 years ago so I can't quite remember. The web pages I looked at all talked about creating a new paper size, so I assumed that's what I must have done, but you are right - the borderless option is built in when I look on my Mac.

I guess this means that we need to re-install the printer driver on the PC and try to get these options to show there as well.

Thanks for your help.

I installed the printer driver for her when I delivered the printer (it is my old printer).

I used whatever software a PC uses by default (I am a Mac user, so I don't know this) to open a JPEG on her desktop and print it as a test. It printed borderless.

The issue comes earlier in the process when setting the print job up in Lightroom. To print borderless, I need to be able to set the page margins to 0. You cannot do this by default and on my Mac I set it up by creating a custom page size with 0 width borders. Then when I set that paper size, the sliders in Lightroom can go all the way to 0.

I cannot find a way to make my friend's Lightroom on her PC allow the borders to be set to 0. She has created a page size with 0 width borders, but the sliders in Lightroom still only go down to about 0.13" when dragged all the way to the left. 

Thanks for your suggestion. Please see my response to Bob Somrak's post.

Does which printer make a difference? On my Mac I set a custom paper size so that I can reduce the borders to 0 but I select which printer I want independent of that i.e. I say I want a borderless print and then I pick which printer to print it on.

However, she's using my old Canon Pro-100s. I used it for borderless prints a lot so I thought setting it up for her would be simply a matter of doing what I did for my prints.

In Lightroom, I clicked on "Page Setup..." in the print module and the selected "Custom..." from the page size drop down list. I thought the "..." after Custom meant a dialog box would appear to allow me to specify my paper size and margins. But it didn't. I tried the same process with her Brother printer selected for printing and the same thing happened.