Josnoww

Hi @walterww,
 
I am sorry to hear you are having trouble with the API. We are currently on a working fix, that will likely be included in the next firmware release.
In the mean time it is possible to work around the issue (on 8.1.0), however this does require you to be in developer mode, and SSH into the printer. If do not feel comfortable doing this I would recommend downgrading and waiting for the next firmware release. Otherwise here are the steps to work around the issue:
Enable developer mode on the printer.  (Be aware that this does mean everyone on your network can access the printer, and thus all the files and keys on it!) SSH into the printer as root user (ssh root@<your_printer_ip>). The password is 'ultimaker' Execute  cat /var/lib/griffin/http_api_users.json  
You will get an output similar to this:

The selected parts show the ID and password you can use for the API (they will be different for each printer). The top one is the ID, and the bottom one the password.
You should now be able to use the API like normal.
 
I hope this helps, please let me know if this works for you. 
 
Jos
 
 

Hi @kwakefield
 
Your printer should indicate if the print-core is compatible with the material that you are planning to use. If I understand your question correctly you are wondering is there are any advantages (outside of compatibility) of using a dedicated print-core for a set of materials. I am not aware of any advantages here, it might depend on your personal preference. The printer will ensure that the core is properly prepared for the material that will be used. This includes purging the print-core to remove any material from the previous print-job, and like you said, the temperature of the previously used material is taken into consideration here.
 
I hope that answers your questions, if not please feel free to ask more!
 
Best regards,
 
Jos