Need help with print trim marks outside the image boundery.

[Richard.Wills]

Crop in LR, then print to jpeg, paper size set to 10x12, giving you the 1" border. Re-import, then print to paper size i.e. 36x50, with cell size 10x12", stroke border 1px gives you the trim lines.

[mcbroomf]

Now you really have me scratching my head. I have been cropping using inches for the past 15 years

How do you crop in inches in Lightroom?  I can only see how to crop to a ratio in LR that will give a variable print size (to that ratio) depending on the # of actual pixels remaining and your PPI.  As you say that may need resizing (either way) later on.  I always do this in PS after getting the ratio I want in LR if I edit in PS rather than Export.  You can crop in inches in PS of course as long as you set PPI as well.

[dgberg]

Finally got it to work, all my fault. In Photoshop under canvas I only checked 1" vert. and 1" Horizontal and it looked right. Problem was it was splitting that 1" into 1/2" borders screwing up everything. Added 2" to vert. and horizontal and bingo all is well.
Now the only problem I see is the crop marks. Any side that you trim off will cut the trims marks off the other side. Now I know why I never took orders for small prints, grrr.

[digitaldog]

Crop in LR, then print to jpeg, paper size set to 10x12, giving you the 1" border.

Doesn't quite work because again, crop and 'size' in the Print Module depends on other factors as outlined. Yes, I can crop to 8x10 proportions in Develop. And yes, I can add 1-inch border to the printed JPEG using a 10x12 page setup but the issue is, this doesn't guarantee the image is exactly 8x10 as seen here after removing all white:

[Richard.Wills]

Don't know what's happening your end, but when I print to jpeg, LR honours the crop, and gives me the file at whatever resolution I choose (in this case 300ppi)

[dgberg]

So I did the first 100 with trim marks printed. Printed 3 at a time for easier handling. Aligned two sets of prints together and cut all 6 at one time on my 36" Rotatrim.
Took me almost 2 hours to trim 100. Did not charge enough. Will need to charge $1.00 a print for trimming to make it worth my while. Or find a faster way to trim

[Richard.Wills]

I have trouble imaging what the edges of prints, cut with the graphtec, feel like in the hand, as opposed to cut with a blade or rotatrim.

If these types of small_print orders only come up occasionally, then I'd just up the unit cost. $50/hr is low to fair, as your material costs for this stage of the operation are zero, and your other machines can keep doing other things to print money.
If they become regular, then if you're just looking at RC or basic matt paper, I can happily recommend the little surelab printers. Not cheap, but construction is excellent, and no trimming needed. The Epson profiles were poor, and monochrome isn't up to the level of an art machine, but super fast for glossy 10x8's... Obviously dye ink, but with a custom profile, the results are way better than what you might imagine for a 6 channel machine.