Nema 17 Linear Actuator

This is a simple Nema 17 stepper motor driven linear actuator. Not very powerful but I thought I would share it anyway in hopes to get input from the community to improve it. I'm working on a new version that uses a worm gear to improve torque and maybe a DC motor driven version with a gearbox. It uses a 6mmx13mmx5mm bearing in the Lower Bracket and a 1/4x20 hex nut in the inner sleeve. You can set an M601 code in your gcode around 10mm to pause and insert the nut/bearing. I used ¼" x 20 threaded rod to drive the inner sleeve.