I have found (as pointed out earlier) that no matter what glue is used or what printer (I use both the Color laser at work and my inkjet at home) that using wax paper (to protect against glue sepage) and books (lots of heavy books) keeps the warpage down massively. While doing those long passages in Gothic Realms (the fold overs) warp no matter what printer I used, no matter what glue I used unless I put them under books for a day or so.
But when they come out from under the books....
they are straight as a board, and if the right amount of glue is used, they are very stiff.
I used the same technique on my rail and road bridges from SOM and it works quite nice. Only issue is that you have to wait to complete the builts.
Hope this helps.
CCotD'