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Just made similar with GRBL and arduino. cuts out every time the arc starts. double shielded motor cables, star earthed at biscuit tin containing arduino+stepper driver. Ordered torus ferrites and opto-isolated 4-channel drivers. fingers crossed. Great project.
Inspired by your spider I've made a rebar leg similar. My supplier only had 12mm rebar and I couldn't bend it so I half cut and welded but it gives a great sharp angle , the legs are more anatomically correct and the abdomen roughly sized ok. Love the idea of rebar for the legs gives a hairy appearance. Ordered six red cats eyes for the head. . Am considering having it on a pullcord towards my front door for halloween .