Manual multicolour printing: unnecessary blob after tool change  

Manual multicolour printing: unnecessary blob after tool change

I was reminded of this after reading the unnecessary M600 thread (can you tell?).  When I print two different colours on the first few layers (to embed some text or graphics), after I load the new colour and the extruder squirts a bit of filament onto the front-right of the build plate, the nozzle then returns to the last point it was at, lowers the z-axis, and dobs a bit of the new colour on top of the last bit of the old colour, before heading straight off to the wipe tower.  That dob of new colour can be visible if, say, it's a darker colour on top of the first layer of a lighter colour.

This seems unnecessary to me - why can't the nozzle go straight from the front-right to the wipe tower? 

My work-around is to place a sheet of paper on top of what's already printed, to catch the dob, then remove it once the nozzle heads for the wipe tower.

I'm not fluent in gcode - I had a look for the instruction that returns the nozzle to the last point before heading for the wipe tower, but I couldn't find anything.  I guess it might be built into the firmware.  But that unnecessary M600 thread reminded me to ask here whether anyone knows of a better solution than my sheet of paper.