40$ SCARA Arm

This SCARA robotic arm is suitable as a base for programming projects. Considering it costs less than $ 40, the strength it can support is not very high. The choice of materials is mainly due to the fact that I wanted to use some pieces I had in stock(For this reason I used reed sensors and 3$ stepper motors).

The top plate ("top.stl") is suitable for both a stepper and a 360 servo to handle Z movement. If you are using a servo, you also need to print the rev counter (“rev_counter.stl”) and mount an extra magnet and an extra reed sensor. If you use a stepper, you will only need an extra coupler. For convenience I recommend the second solution (also because it's simpler to program).

I decided to leave a thread hole at the end of the arm so that you can design your own modules and I hope that you will share them with the community.

I advise you to convert the steppers to bipolar function, so they will have more torque and they will work directly with the Arduino RepRap and CNC