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There are 4 main groups of parts needed to build the AR4 robot:
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AR4 Combo Kit - This includes all the aluminum structural components, hardware components and primary electrical components.
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Stepper Motors and Drivers - These are available at the lowest price; factory direct from Stepperonline (see link on this page).
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3D Printed Components - You will need to 3D print your covers and spacers in any color you choose.
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Misc. Components - Please see the bill of materials in the AR4 build manual for the miscellaneous materials you may need.
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