Cheapest CNC Router 3D Printed beta

thingiverse

This is an alpha prototype of a budget-friendly CNC router designed with DesignSpark Mechanical CAD. The concept revolves around using standard smooth rods and LM12UU bearings or mirror finish stainless steel tubing paired with a 3D printed bushing insert. Modifying the holes for guide rods in DesignSpark is straightforward. This design is optimized for NEMA17 steppers. The spindle mount dimensions are based on my China-made knockoff Dremel tool; please verify your own measurements. Originally, I designed it to use M8 threaded rod but am now seriously considering switching to M12 due to excessive whipping at high speed movements with the current setup. You will need to check the nut size accordingly. The bearing opposite the stepper motor and thread rod is a 608zz model. In my previous machine, I didn't secure the opposing end of the threaded rod, allowing it to move freely without significant issues other than whipping, which I suspect will be exacerbated by adding a bearing and introducing resonance. For printing, I recommend using high infill and a solid or 5-8 perimeter infill for added strength. Although it may seem over-engineered, you'll appreciate the design's stability under torque loads on plastic components. This project is intended for use in developing countries as a 'vitamin kit' for low-cost machine fabrication, enabling entrepreneurs to bootstrap their fabrication business. The inspiration behind this design stems from the now-defunct Lumen Labs CNC.