Ok, I was able to fix my problem using that snapping feature and overlapping a little the objects where it doesn't work. Thank you for your help!

Hello all, I'm drawing a simple logo for an app and I noticed that some edges are not perfectly aligned even though I've enabled snapping to the grid (I used the axonometric grid). This problem can be noticed both from Inkscape and from GIMP, what could be the cause? I looked in the manual and in th...