Hi,
I have experimented that if you use [base_name] in the template you can get duplicate text in your file name.
Try it :

1. load stl file
2. slice it
3. save it having [base_name] in the template
4. change samething in the print settings
5. slice again
6. save again and you will get all the template duplicated.

I have fixed it changing in this way the file ParseFileFormat.py but I'm not expert of Cure and Python too, so I think that will be a better way to do it.

import re
from UM.Logger import Logger #Adding messages to the log.

Substitute print setting values in filename format

def parseFilenameFormat(print_settings, filename_format):
base_name = print_settings["base_name"]
job_name = print_settings["job_name"]
Logger.log("d", "base_name %s", base_name)
Logger.log("d", "job_name %s", job_name)
no_base_name_format = filename_format
no_base_name_format = no_base_name_format.replace("[base_name]", "")
no_base_name_format = no_base_name_format.replace("[job_name]", "")

for setting, value in print_settings.items():
    filename_format = filename_format.replace("[" + setting + "]", str(value))
    no_base_name_format = no_base_name_format.replace("[" + setting + "]", str(value))            

no_base_name_format = re.sub('[^A-Za-z0-9.,_\-%°$£€#\[\]\(\)\|\+\'\" ]+', '', no_base_name_format)
filename = re.sub('[^A-Za-z0-9.,_\-%°$£€#\[\]\(\)\|\+\'\" ]+', '', filename_format)

Logger.log("d", "no_base_name_format %s", no_base_name_format)
Logger.log("d", "filename %s", filename)
if no_base_name_format in base_name:
    filename = base_name

return filename