Стойки надо бы или из швеллера сделать или уголками усилить - раскачиваться будет.
Поднимайте всё же скорость. Разберитесь с контроллером (микропереключателей). Посмотрите настройку силы тока - 100%, Спад тока в обмотках - быстрый. Дробление шага 1/2 но лучше 1/8. А потом ковыряйте настройки MACH.
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