Are you able to ship us samples of the tubing you use / used / plan to use for building a v3 rotator? The pieces only need to be long enough to check for fit, not to make a complete mast or boom.
Several students are working on small changes to the v3 rotator design to reduce the unique number of parts, reduce the number of assembly steps, and to make adapting the printed parts to locally-available supplies easy (i.e. not requiring being a FreeCAD expert). We have posts about some of these changes at our Twitter account https://twitter.com/ValpoWIREDlab
There are several holes in the printed parts that need to be the correct diameter for whatever tube or pipe is being used for the cross boom and mast. A C.S. student is making a simple web app which takes the diameter of your available tubing and returns a print-ready STL file with the proper dimensions.
We want to test this system, before it goes live, with tubing and pipe from all over and not just the imperial standard sizes available to us locally. Sourcing metric parts is difficult for 2 reasons: we don’t really know what is “readily available” for you, and where you buy your supplies.
We have a small grant specifically written to buy or reimburse people for sending us metric-sized parts from all over the world. The parts are cheap but shipping is a bear, hence the extra funding.
Thanks for your help!