I wanted all the 3D squares to be only square and not leaving a sharp edge with them, here is my view of it.

Is there anyway to fix this?, thanks.

Path->Union?

thanks for those answers but when I union literally every object its color changes to only one color which is annoying.

An example Inkscape svg file will help.

I didn´t meant to unite everything - but based on colors should work to get rid of the anti aliasing gaps - when it´s all about this? You could be bit more precisely with your description methinks.

I actually found the solution, it was using the bezier tool with adjustments and then unifying it with the drop shadow. It is a bit of a long process. if there is a much shorter method, please tell me!. Thanks