Yes, Bob is right - it sounds like you need to adjust the top z-limit switch (on the top of the back panel, on the left as viewed from the front - behind the left most z-axis guide rod).
Regarding the problem with the plexiglass not moving up with the springs - make sure that the washers under the bed aren't getting caught in the keyhole slots. I don't know exactly what the current shipping configuration is, but when I first got mine, about a year ago, the washers were too small, and would partially catch in the slots, making bed leveling a nightmare. Adding slightly bigger washers on top of the existing ones made a huge difference. I too used to dread taking the bed off - now I do it all the time, and don't need to re-level afterwards.
Then adjust your z=0 level. With the power off, move the head to it's home x-y position, and screw all of the bed-leveling screws about half-way in, and then turn the coupler on the z-axis to move the bed, until the bed is just touching the tip of the nozzle (doesn't have to be perfect). Then adjust the z-axis limit switch so that it is just triggered in this position. Be careful not to strip the threads on the switch - they can be weak. This will give you the right z-axis home, and enough room to adjust the screws to get the bed level.
To level the bed, heat the head, and then auto-home it. Release the steppers if needed, and then move the head by hand to near the front left leveling screw (but leave yourself room to get to the screw with the driver). Slide a sheet of paper under the head in that position. Tighten the screw until you don't feel any tension on the paper as you move it around. Then unscrew it slowly, until you just start to feel the head catching on the paper. Then give an extra 1/8 turn out to make up for the thickness of the paper. You want your z=0 position to be literally with the head just touching the bed, but not deflecting the springs any further. Repeat this in all four corners, moving the head each time, and then go back and check the first corner, and continue until all are just touching.
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mostlyatomicbob 34
Although I am still somewhat new to this printing game. It sounds like you need to adjust the 'Z' limit switch.
go to the bottom of the page here:
http://wiki.ultimaker.com/Ultimaker_rev.4_assembly:_Mounting_the_electronics
and follow the instructions and see if that helps.
It might also be worth adjusting the leveling scews on the Perpex bed to a mid point before doing the above, that way you have adjustment to raise or lower the plate when levevling.
Bob
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