Assumption: When you say "the square is .7mm", you mean that the square is .7mm thick in the non-square dimension. For example, the shape as a whole is 4mm x 4mm x .7mm.
If the above assumption is true, you are on the right path. Your freestanding shapes need to be at least .7mm. I would actually increase that to at least 1mm for anything that sticks out more than a few mm without support from other pieces. I printed a sword at the .7mm minimum in WSF as the first model I did, and it was rather flimsy. Very flexible and strong for its thickness, but it also was very un-swordlike in its flexibility.
Your sword has a lot of separate pieces. I think you need to find ways to connect those together - let them support each other. Make sure that adjacent surfaces are touching - it will be a pain to paint anything too close together anyway.
From your comments, I assume you have seen the WSF materials page. Take another look at the guidelines.
https://www.shapeways.com/materials/strong-flexible-design-gu idelines
Examples:
The Bringer:
https://www.shapeways.com/model/422097/bringer_of_justice.htm l
On this guy, the wings are almost 2mm thick, so they are pretty strong. I did this because the wings are so large. The loincloth drape-thing is closer to 1mm or so. The size of things dramatically affects how thick they must be for strength. I even made the details on the armor larger than the .2mm minimum detail so I could be sure they would be easy to paint.
Steampunk Engineer:
https://www.shapeways.com/model/540396/chief_engineer.html
On this guy, the things that stand by themselves (tubes, hoses, coat, hands) are all close to 1mm or more. The black tubes are hollow, but the hoses on the oxyacetylene welder are not hollow. Save money where you can, but not at the expense of strength.