Figure 2
From: Rapid manufacturing of micro-drilling devices using FFF-type 3D printing technology

Overall fabrication process to manufacture MDDs with 45°-tilted, 0°, and helical blades. (a) 3D printing the PLA casting mold using FFF-type 3D printer; (b) Pouring the UV curable resin into the casting mold followed by degassing process, and inserting the neodymium magnet; (c) Curing the resin using UV lamp; (d) Separating the MDD from the casting mold by soaking in acetone.