Syringe extruder for 3Drag printer

3Drag 3D printer syringe extruder has been designed at +LAB. Previous versions of the extruder are available at Thingiverse: version 1, version 2

LDM (liquid Deposition Modeling) is a particular 3D printer process in which a viscous fluid is extruded from a reservoir and deposited on the build plate. This process is more generally called Direct Ink Writing (DIW).

The third version of the LDM extruder was developed with the purpose of making a modular extruder, easy to assemble and disassemble:

• The syringe holder is stronger than the previous version and can be used to easily mount syringes from 10ml to 60ml.
• The extruder assembly is divided into three main parts. If one component broke you can easily switch is without disassembling the extruder.
• The completely redesigned drive unit is stronger and smoother. The M8 screw has been substituted with a T8 lead screw. Two versions are available with a 2:1 and 4:1 reduction. The 4:1 reduction provides a higher extrusion force.

BOM

• Mount plate:
  • 4x nut M5
• Syringe holder:
  • 4x bolt M5x50 mm
  • 4x nut M4
• Guide:
  • 2x square nut M3
  • 2x set screw M3x10 mm
  • 1x bolt M4x10 mm
  • 4x bolt M4x16 mm
  • 4x bolt M4x30 mm
  • 2x steel rod (or tube) 4 mm OD x 157 mm
• 2:1 Gearbox:
  • 4x bolt M4x30 mm
  • 8x nut M4
  • 2x trust bearing 10x24x9 mm
  • 1x T8 lead screw 8mm OD x 200 mm
  • 4x flat-head bolt M3x12 mm
  • 4x set screw M4x8 mm
  • 1x Nema 17 stepper motor
• 4:1 Gearbox
  • 5x bolt M4x40
  • 10x nut M4
  • 1x bolt M5x40
  • 1x nut M5
  • 2x trust bearing 10x24x9
  • 2x trust bearing 8x16x5
  • 1x T8 lead screw 8mm OD x 200 mm
  • 4x flat-head bolt M3x12
  • 4x set screw M4x8
  • 1x Nema 17 stepper motor
• Tools:
  • M4 tapper
  • 8mm drill bit
  • saw
  • screwdrivers
  • hex keys