Open-source wax 3DP for investment casting

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Contact Dr. Joshua Pearce at Free Appropriate Sustainable Technology

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This procedure for open-source wax printers is based on work done at MichiganTech with RepRap derivative printers and custom RepRap driver Franklin.

Follow all safety procedures for your printer and the space you are in.

Information about how to construct a delta-based printer can be found here.

1. 3D printer capable of printing wax
2. Printable wax (found from Machinable Wax)
3. Glue stick

Information on how to calibrate a delta-based RepRap printer is found here.

1. Obtain an CAD model of your desired part
   1. Search 3D model repositories (Yobi3D, Yeggi, Thingiverse, YouMagine) for existing models
   2. Design a custom part using CAD software (free and open-source options include FreeCAD and OpenSCAD)
2. Slice your model using a slicer (options include Cura and slic3r) using suggested settings:
   1. Print speed: 25-40mm/s
   2. Brim-type adhesion
   3. 130C
3. Save g-code

1. Inspect the work area for any potential hazards and ensure equipment is properly hooked up
2. Turn on printer and computer and navigate to your printer control software and load g-code to printer (if using Franklin, additional information can be found here)
3. Apply glue stick to print bed and allow to dry completely
4. Press print

1. Printed parts can be removed carefully by hand or by gently lifting the edges from the print bed with a razor
2. Printed parts can be wax welded to other pieces
3. Print lines on the parts can be smoothed with hot utensils

1. Allow hot end to cool to 50C before shutting off the printer