Imprimante 3D D-Bot Core-XY

It has been a long time I want to make a corexy machine, since I found this DBot and decide to make one. Thanks Spauda for this great design. As you can see in the photo I modified the motor-mount to use my motor that come with pulley. There is a little problem is that I can make the V-Wheels run very smooth, I don't know what is the problem, maybe the shims I printed are not thick enough.

Here is the video, http://v.youku.com/v_show/id_XMTUzMjY2MDExNg==.html?refer=pc-sns-1

http://v.youku.com/v_show/id_XMTUzMjY2NTU4MA==.html?from=y1.7-1.2