Inkjet 3Dresyns OTO are resins designed for making durable hearing aid shells, ear molds, hearing protection and special headsets and are available in different durable finishes, from ultra hard and tough to flexible and soft.

Our 3Dresyns OTO can be custom designed to comply with the Quality requirements for Class I, IIa & IIb of ISO13485:2016 and ISO10993 for the manufacturing of medical devices: hearing aid shells and Otoplastics.


  • broad range of physical properties: from ultra hard and tough to soft and flexible grades
  • broad range of basic colors
  • very high resolution 
  • dimensional stable “non deformable” grades
  • very low shrinkage
  • printable by most commercial and professional Inkjet printers, including Multijet and Polyjet printers
  • negligible potential risk of skin irritation of the final hearing aid user, caused usually by residual unreacted agressive monomers, as it might occur with other existing high irritating monomer based commercial products
  • compliant with the Quality requirements for Class I, IIa & IIb of ISO13485:2016 abd ISO10993 after customisation