Printrbot / wade / laser mountIt slides quickly onto the engraver mount, to use a marker instead. It is approximatly the same place on the head as the engraver end would be. The Z endstop modification works with it as well.http://www.thingiverse.com/thing:30590PRINT WITHOUT SUPPORT, or the marker wont fit. The little droop of the top bridge holds the marker in better.Sharpie makes the circuit trace resist markers 'etch resist pen', this is what this fits. It is a standard sharpie design.The marker comes in and out without removing the mount, so getting a cap onto it quickly isn't difficult.It seems to be .4 wide, on paper.Thanks to beardicus, and his good sharpie model. http://www.thingiverse.com/thing:15647PrintRbot laser mount thingiverse.com/thing:30064PrintRbot engraver mount thingiverse.com/thing:30520PrintRbot marker mount thingiverse.com/thing:30999PrintRbot Z end stop extender. http://www.thingiverse.com/thing:30590