You can purchase an extruder with 0.1mm nozzle at Novio 3D Online Shopby Gaver1974 - Reprappers
Check out this new 3D printer in the Philippines. http://www.novio3d.com/ Novio 3D printer has the best quality and is the most affordable 3D printer in their class. This 3D printer offers the best high definition super fine 3D printing technology with very user friendly Auto 3D print software, upgradeable to dual print-heads (coming soon), extendable print plate, high definition quality print wiby Gaver1974 - Philippines RepRap User Group