MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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I love everything renewable also and have a playhouse for my kids with it's own solar and powerwall i just have my doubts on the usefulness of 5w, like i said not being negative as it's a fantastic project. I broke my slipring in assembly as the bar for the tail has to pass by where the power wires routes and it's so easy to damage. Managed it the first time but on stripping it and rebuilding it just wouldn't go and they broke, have a replacement to go in but shall see if i can manage this one without breaking.

Re the bearings i agree and also the choice of stepper to a point as they were an obscure size wise it worked out quite expensive.

Good luck on the build.

My powerwall build https://www.youtube.com/watch?v=agXVW4nIOOg