But keen to hear the results of your test.
You can always slow down Infill via the Speed settings too if it was unavoidable to print with it.

already slicing the optimized model to find out for myself. but like i said its a large model taking up almost the entire buildable area of my sd3, so slicing is taking its sweet time . might get the answer here before its done slicing.

The wall thickness of the model dictates how many perimeters and infil is needed/possible... if you are getting a perimeter with a gap thats being infilled, then the model walls must be thicker than 2 perimeters (each perimeter being what is set in Slic3r->Advanced, usually .42 on a Solidoodle).

You could disable (in future) Infil entirely for the print, which will prevent it trying to fill the gap between the two perimeters.

Or optimise the model to have only a .84mm wall (therefore, 2 x perimeters).

I like to mess with people and use a 1mm wall for this exact reason. Haha seriously though, this is something we all need to think about when designing hardware specifically for the doodle. Use multiples of.4-.44 mm for walls where your able to. I am a big offender of this.

You could disable (in future) Infil entirely for the print, which will prevent it trying to fill the gap between the two perimeters. If you want hollow things, set Infill to 0 . If you want it solid between the walls, set Infill to 1.

Or optimise the model to have only a .84mm wall (therefore, 2 x perimeters).

any way to force it to print a regular perimeter thread instead of this god awful vibration crap? got 6 hours of this print left, hoping my printer survives this shakedown.