MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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If its only to print these parts/props it might be better to use a 3D printing service for FDM parts this is not too expensive and usally the quality will be better. As for size you can always cut the piece up in different lengths thats why I include the stp of the entire prop. Currently the parts are cut up too fit my CR10 with a build volume of 300x300x400. I'm finishing up the holy axe Rhitta and I would then recommend the CR-10 or a similar printer with an equal or larger build volume to limit the amount of parts. A local makerspace might also be able to print these for you. (if you have one nearby).