I was having trouble getting the first layer to stick so I mounted an acrylic bed. I had to move my Z end-stop up, so at the same time I mounted the Z end-stop on an adjustable riser, so that I could fine tune my Z offset.
With these two tweaks I was able to get a really good print of belt-width-adjuster_1off.stl
The trouble was that it stuck to the acrylic too well, and was near impossible to remove, in the process of removing it I completely wrecked the underside of the print.
I have been told that a good material to print onto is scotch blue tape, so I am going to try that next.
Giles Bathgate 