Fig. 3
From: Material characterization and selection for 3D-printed spine models
(a) Close-up image of bur in its holder attached at top motor sweeping across the specimen (human vertebrae) that is clamped within a cup on the bottom motor. The bur spun at 75,000 RPM which only required a foot on the pedal to run it, similar to how most burs operate in surgery. (b) Close-up image of bur sweeping across Dental® resin printed cube