Anet A8 twin pen holder

A dual pen holder for the anet a8 to allow it to draw double images
needs two springs to keep the pens on the print bed
works with up too 14 mm diameter pens
designed to fit where the print cooling fan usually sits
May limit print volume so check before you print

single pen version: https://www.thingiverse.com/thing:2829624

Update 1
A travel friendly back plate has been added to avoid streak marks when traveling
set the z to go by at least 4 mm when travelling