Install and print from two identical printers on iMac? I have two Dymo label printers. I tried installing the printer using CUPS web admin as well as the Print &amp; Scan under System Preferences. Both printers installed fine. When I print from either the print jobs are sent to only one of the two. The purpose of two printers is to avoid the constant changing of label sizes. 



If it helps: my goal is to have two printers available. One prints large labels. The other prints small labels. When i go to print, I am able to choose which printer to print from.
Dymo label drivers are quite picky and ask that you not connect the devices until the installer asks specifically for the device to be connected. I believe that is to prevent both queues going to the first device in the USB chain, but I don't have two to test with.

I would delete both printer definitions and start with the installer from here:


https://dymo.custhelp.com/app/answers/detail/a_id/101/~/dymo-drivers-and-downloads#lw_mac


The read me has the following caution:


  NOTE: Do not connect the USB cable to your computer or USB hub until
  instructed to do so during the software installation. If you have a
  label printer already installed, disconnect the USB cable from your
  computer before running the installer and reconnect the cable when
  instructed to do so.


So you could try deleting only one queue and then disconnecting the printer that printed from the other queue and try setting up the second printer again.