pMulti micropipette

Download the zip files containing the 3D models:

• Micropipette model files.
• Tip ejector models.
• Parking post models.
  • Alternative tool-wings for 8 mm rods are available.

The total amount of each part that should be made is listed in the below and in the BOM.

Here is the complete Bill of materials (, ) for this guide.

Tools and Materials

Tools:

• 3D Printer (x1)
• CNC Lathe (x1)
• Drill (x1)
• 6 mm drill bit (x1)
• M5 Tap (x1)
• Silicone Grease (x1)

Materials:

• 20 mm diameter Delrin stock (x1)
• PLA Filament 1.75mm (x1)

Parts

Parts for OLA's pOne micropipette.

Tool plate

Tool-plate:

• pMulti tool-plate N (x1)
• Kinematic coupling:
  • M5 x 10 mm Button Head Screw (x3)
• Attachment to tool:
  • M3 x 16mm Screw (x4)
  • M3 Hex Nut (x4)

Wedge plate:

• THSL wedge-plate N (x1)
• M3 x 8mm Conical Head Screw (x3)
• M3 Hex Nut (x3)

Parking

Tool parking wings:

• Parking wing base (x1)
• Parking wing (x1)
• Parking wing (mirrored) (x1)
• Parking wing o-ring base (x4)
• 6x2 Nitrile O-ring (x4)
• M3 Hex Nut (x6)
• M3 x 16mm Screw (x4)
• M3 x 20mm Screw (x2)

Tool parking post:

• Tool post base (x1)
• 5x65mm Steel Rod Beveled (x2)
• M4 x 20mm Screw (x2)

Actuator

Motor:

• pMulti motor base (x1)
• NEMA 17 Short Body Stepper Motor (x1)
• THSL Leadscrew D8xL2 75mm (x1)
• NEMA 17 5-8 Shaft Coupler (x1)
• M3 x 10mm Screw (x4)
• M3 Hex Standoff 10mm (x4)

Guide rods:

• 8x146mm Steel Rod (x2)
• M3 x 10mm Screw (x2)
• M3 Hex Nut (x2)

Endstop:

• MakerBot Endstop (x1)
• M3 x 25mm Screw (x2)
• MakerBot endstop rod base (x2)
• M3 Hex Nut (x2)

Carriage:

• pMulti actuator carriage (x1)
• LM8UU Linear Bearing (x2)
• THSL Nut D8xL2 Anti-Backlash (x1)
• M3 x 12mm Screw (x2)
• Compression spring 50 mm (x2)

Plunger attachment:

• M4 x 10mm Set screw (x2)

Cables and management

Cables:

• NEMA 17 Cable 1000mm (x1)
• MakerBot Endstop Cable 1000mm (x1)

On the tool side:

• Cable base (8-wire) (x1)
  • Alternatively, for 4-wire cables, print PIP-CABLE-BASE-4W.stl.
• Zip Ties (x2)
• Cable base rod fixture (x1)
• M3 x 16mm Screw (x2)
• M3 Hex Nut (x2)

To guide the cables to the backpanel:

• Reinforced Bowden Tube 1 meter (x1)
• One of the cable bases, as counted in the backpanel BOM.

Pipette

Base part:

• pMulti bottom base (x1). Serves as the lower support for the rods.
• M3 x 10mm Screw (x2) (rod attachment).
• M3 Hex Nut (x2) (rod attachment).

Tip-holder:

• Multi-fit Tip-holder (x1)
• 6x2 Nitrile O-ring (x1)
• pMulti tip-holder stop (x1)
• pMulti spring bottom shim (x2)
• M3 x 25mm Screw (x4)
• M3 Hex Nut (x4)

Tip-holder and spring seats: two variants exist, choose one.

• Narrow spring version (default):
  • Compression Spring 17 mm (narrow) (x1)
  • pMulti spring top seat (narrow) (x1)
  • Spring centering shim (x1)
• Wide spring version:
  • Compression Spring 17 mm (wide) (x0)
  • pMulti spring top seat (wide) (x0)

Plunger: also in two versions.

• Machined shaft and screw version (default):
  • pMulti machined plunger (x1)
  • M4 x 16mm Conical Head Screw (x1) (16 mm thread length, 20 mm total length).
  • pMulti shaft holder (screw) (x1)
• Dowel pin shaft and magnets version:
  • 50mm Dowel OD6 pin (x0)
  • D6xL2 cylindrical magnet (x0)
  • pMulti shaft holder (magnets) (x0)

Ejector post

Support extrusion:

• 2020 V-Slot Aluminum 380mm (x1), M5 tapped on one end.
• M5 x 25mm Screw (x1)

Ejector atachment brackets:

• 2020 Angle Corner Connector (x2)
• M4 Drop-In Nut 2020 (x2)
• M4 x 10mm Screw (x2)
• M5 Washer (x2)

Ejector:

• Tip ejector fork (x1)
• M4 x 20mm Screw (x1)
• M4 Hex Nut (x1)
• M5 Washer (x2)