I’m starting my first proper design. At this early stage on the learning curve I’ve edited several models from thingiverse but now want to try my own simple rectangular box. It’s purpose will be a mains electrical ‘dry box’. (I could buy one for about 90p!) I already have a two-way socket which will become its ‘lid’, so my box will need mounting holes for self tapping screws (or threaded bolts) and a larger hole for cable entry. I will be able to specify exact dimensions of length, width, depth, hole positions, and wall thickness. But before I start coding I’d appreciate advice on a basic design question please. I understand that the ‘obvious’ approach to a hollow box would be subtracting one cube from another. And then essentially a series of similar unions and differences to create the supports and holes. But I’m wondering if an alternative is possible (either in OpenSCAD or Cura, or both), that I might find more intuitive. Specifically, could I make several sections and ‘merge’ them together? Make the base, a solid rectangle. Then an ‘empty’ rectangle, with its edges say 3mm wide. Extrude that to the required box depth. Then merge/weld those two components together? Terry -- Sent from: http://forum.openscad.org/