This is a pen holder for Anet A8, but it can be used for any 3D printer with the same blower fan.
It's designed for be mounted on the blower fan of the "ANET A8 | Customizable E3D v6 Carriage / Bowden Mount by TNS".
For the stock configuration, you just have to mirror the object, with your slicer.
Max pen diameter: 16 mm
1 M4 screw, for screw the pen in place.
2 longer screw for secure the Plotter Mount, to the blower fan.
Use the following instruction (taken from other project):
temperature to 0
layer height to 0.2mm
shell thickness to 0.2mm
turn off all supports
nozzle size to 1mm (if you use a thinner pen, change it)
minimum travel set to 0.01mm
enable combing : all
z hop when retracting : set to at least 3mm
G21 ;metric values
G90 ;absolute positioning
M107 ;start with the fan off
G28 X0 Y0 ;move X/Y to min endstops
G28 Z0 ;move Z to min endstops
G29 ;calibrates Z
G0 X0 Y0 Z15
G91 ;relative positioning
G0 Z15 ;move Z up before moving away
G28 X0 Y0 ;move X/Y to min endstops, so the head is out of the way
G1 Y190 F9000 ;use this line if you want the bed to move to the front. delete if not.
M84 ;steppers off
If you use Simplify 3d, you have to modify the Global G-code Offset (as showed in the pictures).
The following video describes the easiest way for get an stl, starting from an image.