Sometimes all I'll get done on any particular day is that I'll lay out what I need so that the next day I can just start right in. Even on days that I get a lot done, I'll always try to end by doing the first step on whatever is going to come next. That can be as simple as unscrewing something that needs to be removed or finding the piece of wood I'll need to be cutting up tomorrow.

At the moment, I'm sort of in that "in between projects" mode (though technically I have several projects in the pipeline). But I don't think a day goes by that I don't do something related to modeling. Sometimes it'll be nothing more than a small materials test. Other times it's just a bit of research.

Also pausing now and then during a build allows you to come back to it fresh and look at what you've done with a bit more perspective.