thanks for the pointer i got the thing to run
For anybody looking in the future
http://www.cups.org/doc/api-filter.html
From the cups documentation
File Permissions
For security reasons, CUPS will only run filters and backends that are owned by root and do not have world or group write permissions. The recommended permissions for filters and backends are 0555 - read and execute but no write. Backends that must run as root should use permissions of 0500 - read and execute by root, no access for other users. Write permissions can be enabled for the root user only.
To avoid a warning message, the directory containing your filter(s) must also be owned by root and have world and group write disabled - permissions of 0755 or 0555 are strongly encouraged.
