I wanted to let everyone know I will be releasing the next version AR4 in about a week. The AR4 will be the same as the AR3 mechanically so the aluminum kit and the hardware kit will be the same, upgrading your AR3 to the AR4 wont be too difficult. The AR4 will be using the Teensy 4.1 board and there are some significant software updates. All the kinematics and motion calculations will be moved to the teensy board. The software will include analog and incremental jogging, speed control will include mm per second as well as moves based on time and percentage as well as some new controls. I will also be making an electronics kit available. I will put on the robot kits back in stock when the AR4 is released. Please let me know if you have any questions.