Summary

This is a carriage that works with the Bulldog XL, E3D Hot End and linear bearings in conjunction with lawsy's linear bearing mounts.
This will replace the stacked design with a simple snap into place carriage for the extruder only. All credit goes to lawsy, adrian and 2n2r5 for getting the ball rolling.
Happy Printing

Instructions

Print it solid with no infill or support on its side at .3mm with a good brim. The support is built in so some clean up is required.
Especially around the nut holders for the belt and the fan area. most of the support will clean up well with a good razor. You will have to drill small holes for the fan screws. The fan duct support needs to be removed to allow air to move towards the hot end. The fan supplied with the Bulldog moves enough air that the fan supplied with the E3D is not needed or recommended as you would have two fans pushing against one another.
The FBCAR.stl is for the forward bearings and prints like an upside down U with the same settings and when complete should just snap into the main carriage. (do this after the rear bearings are on the rear rod and clipped into place). Then just swing the carriage down onto the FBCAR that is clipped onto the forward rod. (even with the right side)
I have added the rear fan assembly which replaces the FBCAR with an integrated G-code controlled fan duct. This is a tight fit but snaps in just like the FBCAR did. You'll have to glue the fan to the duct in my case the fan came with adhesive so it was just peel and stick.
Happy Printing

Solidoodle_Bulldog_XL_E3D_Linear_Bearing_Carriage