Tell us about yourself!
I have an other project where I did that. Check out:http://www.jgscraft.com/midnight/wp-content/images/WireCutter.pdf
I have an other project where I used LCD screen to set the length. Check out:http://www.jgscraft.com/midnight/wp-content/images...This was with a PIC processor, which I know how to program lot better than Arduino.
In the code change the value in line 18 for FEED_STEPS to adjust the length.
RooBee One - SLA DLP Aluminum Frame 3D Printer
The design may have changed over time, however on my machine there is a slot on the vertical frame on the left side. It is mounted in there and triggered when the carriage lowers on the two lead screws. The slot allows you to adjust the position.
Please see bottom of step 12. There is a link to the .ino file.
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