Nice build. How powerful are your stepping motors? I found on mine if I could not turn them with out difficulty with my fingers they would not work. I am using 260 motor's as I remember. Don't be afraid to fire it up. It took me two weeks to get mine running but now it just putts along doing its thing. You can see how I did mine on my thread and what I used. I used Delrin as I found that UHMW as to sticky. I did use UHMW for the adjusters on the Y and Z axis adjusters but found it not strong enough for the X as it was sagging from the weight. I did us Delrin for the Z lead screw to sit on with two acme nuts cinched together sitting on a washer ontop of the Delrin. This works very well. Use vasline with graphite mixed in with it to lub this. I am sure you will get it going. Others were helpful to me when I had a problem and the fellows at Cut2D are wonderful. Keep us posted and let there be sawdust...Ron Broken Balsa