PolyJet

Step 1

Printing

Once the liquid resin is preheated for better viscosity, the printhead begins to move above the build platform, depositing the first layer of material where required. A gel-like support material is printed solidly and simultaneously with the part material to suspend overhangs during printing. The deposited material is then exposed to UV light, curing the layer of photopolymer. Once the first layer has solidified, the build platform is lowered by one layer height and the process is repeated until the build is complete.

Step 2

Support Removal

Water Jetting The most common method, using a pressure washer or water jet station to remove the gel-like support material. Chemical Soaking For more delicate parts, supports are dissolved in a sodium hydroxide bath or using proprietary solutions. Manual Cleaning For fine features or sensitive areas, soft brushes or picks may be used alongside water.

Step 3

Surface Finishing

Light Sanding / Polishing Usually not needed, but can be done gently to achieve a matte finish or remove minor blemishes. Clear Coating Transparent materials (e.g., VeroClear) can be sprayed with a clear lacquer or resin to enhance clarity and gloss. Painting While PolyJet can print in full colour, painting may still be applied for touch-ups or special effects. Surface must be cleaned and primed first. Gloss / Matt Finishing Settings Controlled during the print process, but can also be modified manually post-print with polishing or coating.

Step 4

Curing

UV Exposure PolyJet parts are already UV-cured during printing, but additional exposure can help fully solidify any residual resin, especially after cleaning. Note: Over-curing can cause yellowing in some clear materials.

Step 5

Assembly and Functional Finishing

Gluing or Bonding Parts can be assembled using super glue, epoxy, or resin adhesives. Drilling or Tapping Can be done carefully for mechanical assembly, but parts are typically more brittle than FDM or SLS. Embedding Inserts Useful for prototyping assemblies that need threads or fasteners.

Step 6

Special Treatments

Sealing Clear parts or models exposed to moisture can be sealed with epoxy or UV resin. Rubber-like Materials May require talc dusting to reduce tackiness or improve feel.