MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
What printer, filament and settings did you use? I never had one break off here and printed dozens for all kinds of applications.
As you can see it's a remix of an existing design and the original author did multiple versions as well.
This said I did a new concept that clips to the front so you can keep the downward sensors activated :