Hi, I am prototyping a clock of my own, and making many (hopefully instructive) mistakes along the way. I wanted to ask about something you mention briefly in the PDF that accompanies SP1. You say that the arbor spacing was increased for the gears to mesh properly (top of page 8). Do you have a rule of thumb for doing this? I am using the standard approach that for two gears with X and Y teeth and module m, they should be (X+Y)m/2 apart, or something similar if you use DP. In some places I can see that this makes the gears too tight, whether due to printer tolerance or because the load on the gears puts a bit of sideways pressure on them. I'm experimenting with this, and if you have any guidance it would help the process along.