The airtripper extruder mod to the smartrap requires underside components. So that the baseplate with atmosphere tripper extruder can be used, I've modified the designs. Please be aware that a M4x70 screw is required as the space between the underside parts has increased.
I've added the Sketchup files for the parts.
I've made some tweaks to the documents, The bottom components are can be screwed to a base plate for superior stability. The extruder STL has been mended with netfabb and should not show any difficulties.
Print the components. The bottom parts are screwed together with a M4x70. The Airtripper extruder requires M3 screws. Just look on thingiverse for info at the Airtripper V3 with BSP project.