A Technique for Tracking Prints Using CSS: http://wp.me/pcVrg-XF

post_3699_take1.cfm

<cfscript>
    param name='args.qrURL' default=prc.page.getCanonical();
</cfscript>

<cfoutput>
    <div class="u--printonly detail--trackprint">
        <p>#_('qrcode_explanation', 'Scan the following QR code to learn more.')#</p>
        <img class="u--box" src="https://api.qrserver.com/v1/create-qr-code/?size=200x200&amp;data=#HTMLEditFormat( args.qrURL )#" alt="">
        <p>(#HTMLEditFormat( args.qrURL )#)</p>
        <img src="?trackprint" alt="">
    </div>
</cfoutput>

post_3699_take2.css

@media print {
    .detail--trackprint {
        background: url("?trackprint");
    }
}

post_3699_take3.cfm

<cfscript>
    param name='args.qrURL' default=prc.page.getCanonical();
</cfscript>

<cfoutput>
    <div class="u--printonly detail--trackprint">
        <style>@media print { .detail--trackprint { background: url("?trackprint"); } }</style>

        <p>#_('qrcode_explanation', 'Scan the following QR code to learn more.')#</p>
        <img class="u--box" src="https://api.qrserver.com/v1/create-qr-code/?size=200x200&amp;data=#HTMLEditFormat( args.qrURL )#" alt="">
        <p>(#HTMLEditFormat( args.qrURL )#)</p>
    </div>
</cfoutput>

post_3699_take4.cfm

<cfscript>
    param name='args.qrURL' default=prc.page.getCanonical();
</cfscript>

<cfoutput>
    <div class="u--printonly detail--trackprint">
        <style>@media print { .detail--trackprint { background: url("?trackprint=#URLEncodedFormat( now() )#"); } }</style>

        <p>#_('qrcode_explanation', 'Scan the following QR code to learn more.')#</p>
        <img class="u--box" src="https://api.qrserver.com/v1/create-qr-code/?size=200x200&amp;data=#HTMLEditFormat( args.qrURL )#" alt="">
        <p>(#HTMLEditFormat( args.qrURL )#)</p>
    </div>
</cfoutput>

track_print.cfc

component {
    property name='id' type='numeric' default=0;
    property name='model' inject='model:inventoryModel';
    
    public any function trackPrint() {
        getModel().trackPrint( getId() );

        var trackingPixel = imageRead(expandPath('/images/transparent.gif'));

        return trackingPixel;
    }
}