First layer not adhering to raft - can anyone help? - 3D Printing

I’ve been happily printing for a while now with my Wanhao Duplicator i3 using PLA but a recent problem has occurred wherein, during the initial stages of a print with a large base surface area, the first layer has not stuck to the raft. This produces a surface effect similar to the gills of a fish, where, in one direction, the surface bows and parts of the filament stick up proud of the raft about 3mm high, forming raised ridges open on one side, at regular intervals. This obviously greatly int

Solutions for poor adhesion to the print bed

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