Thanks James,
I actually followed your video to setup the Z-home. The attachment layer was about 0.5mm thick and this may be the reason. I found that if I used the raft provided by CW, that results in 100% failure, if I use the support created by Meshmixer the item will not drop off. But since I make solid block or about 3cm x 2cm x 1cm, even though I made it 90% hollow, the shrinkage still pull the support broken at many points and that results in uneven print. I guess this is the problem of Maker Juice resin?