![]() Arduino IDE and a USB cable for programming.The resistance of a turbo trainer varies depending on how much the cable is pulled: the more cable that is pulled the easier the resistance. The linear actuator allows this to be done using a stepper motor which can be controlled precisely. You will need a stepper motor with a gearbox attached to it because it takes a lot of force to pull the cable. The motor that I used has a 1:27 gear ratio which seems to work well and means that the motor doesn't need to draw too much current. The frame and the slider for the linear actuator are 3D printed. The STL files are attached at the bottom of this page. They were modelled in Sketchup which doesn't export to STL as well as other software so you may get some errors in your slicer software about the model not being manifold which you should be able to ignore, but check the GCode looks like the STL model before printing. You will need the frame and the slider as a minimum. You may also need some spacers for the motor depending on how far you need to pull the cable on the trainer. On my Ender 3, these all printed fine without supports. There is also an STL for a plastic case to house the controller box. I printed this with supports for the holes because some were quite long, but you shouldn't need supports for the slide switch holder. Attach the shaft coupler to the stepper motor.Attach the K08 bearing to one end of the frame using the short 4 screws that come with it (or use your own).Attach the flanged nut onto the slider using the M3 screws.Screw the lead screw through the flanged nut and the slider. ![]()
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