+ 1 on reading the posts in the filasruder section.
The goal is to extrude filament that can be used in a 3D-printer.
There are quite a few companies that offer 3D printing filament.
There are many powdered additives to PLA to give various textures and properties.
wood fill
bamboo fill
ceramic fill
bronze
brass
copper
stainless steel
magnetic iron
carbon fiber
I expect more to come
As far as polymers
ABS and PLA are the big 2
But folks are using
nylon
elastomers like nina flex
HIPS
Peek
Be careful as some plastics will gass of toxic fumes.
Colorfab out of Holland offers some interesting highperformace polymers in pellet form for those who want to extrude there own.
http://colorfabb.com/pellets
Tin
Soliddoodle 4 stock w glass bed------Folger Tech Prusa 2020 upgraded to and titan /aero extruder mirror bed
FT5 with titan/ E3D Aero------MP mini select w glass bed
MP Utimate maker pro-W bondtech extruder
Marlin/Repetier Host/ Slic3r and Cura