I made an Adobe Photoshop template to print my 3-D stereoscopic photos on 5" x 7" (13 cm x 18 cm) photo paper to view them with the OWL stereoscopic viewer. The viewer, designed and patented by Brian May, is available for purchase online from The London Stereoscopic Company.
https://shop.londonstereo.com/lsc-owl-viewer.html
To install the template, download the files listed below from either Dropbox or pCloud, save them on your computer, and open the PSD file with Adobe Photoshop.
Photoshop Templates
Original (80mm horizontal offset)
https://www.dropbox.com/s/iqnewp054l97vlw/OWL%20Viewer%20Printing%20Template%2020210706-001.psd?dl=0
Alternate (64mm horizontal offset)
https://www.dropbox.com/s/nq5tai8wo43p6bm/OWL%20Viewer%20Printing%20Template%2020210711-002.psd?dl=0
PDF Instructions for Original
https://www.dropbox.com/s/5p33xdtne8x43fw/OWL%20Viewer%20Printing%20Template%20Instructions.pdf?dl=0
Photoshop Templates
Original (80mm horizontal offset)
https://u.pcloud.link/publink/show?code=XZ2f8PXZ9U3HHfLjzhmjaiwRkBXDoyA2JuQk
Alternate (64mm horizontal offset)
https://u.pcloud.link/publink/show?code=XZK6qPXZ8JsbCyaoyyXBnSNdGS1JBpnubQp7
PDF Instructions for Original
https://u.pcloud.link/publink/show?code=XZUf8PXZuRjk6dcJb4JW11hOSGeVD81uV0v7