What cauises a 3D model in PLA to warp at one end

[curious aardvark]

1) up the bed temperature slightly.
65 tends to help.

2) Buy better pla.
cheap pla will warp, good pla pretty much doesn't.

3) get some dimafix and use instead of gluestick. Stuff is great :-)

4) reduce the z-gap so the filament gets smooshed into the printbed.

5) print your first layer slower - what print speeds are you using ?
Good adhesion and release is a combination of print settings, bed material and print speed.

6) get a sheet of pei and stick it over your printbed. filament sticks to it when hot and releases when it cools.

[Columbo]

Thanks curious aardvark, I'll try those suggestions. I am using a speed of 60mm/s and I have checked Z Hop when retracted. Would slowing the speed down to about 50 help?

I am using the filament that came with the CR-10S printer and it doesn't say what brand it is. I also bought some filaments by Mech Solutions and Sunlu. What brand would you suggest?