I am new to 3D printing and am struggling to print a basic box 165mm long 70mm wide 40mm deep. the corners of the box keep lifting? i have tried 3DLAC & magigoo but still the corners lift.

the fist layer seems to be perfect the nozzle temperatures are 240 the heat bead is 110.

Any further sugestions

First is to level, level and level again. Next is getting the correct first layer. What printer, print surface, slicer speeds etc. this is minimum basic info that is needed.

Printer really needs to be enclosed and warm. I would drop the bed temp after the first layer at least to 105 and maybe 100. ABS takes work so go google it and read everything you can find.