Homebrew PCBs

Hi ,
I make sometimes a pcb as hobby . I use the pcb program sprintlayout , convert the file to dxf and with a cam program to g-code . My milling machine is a bridgeport cnc with a highspeedspindle . It works well .
When there are two copperlines with a very small distance then is between this lines a small copperline that can become loose and can make a short circuit . Does some knows a programm that automaticly combine two lines ?

Thanks

Hans