Instructions for Use "IFU"
These generic instructions can be used for the majority of our 3D resins, with the exception of special resin systems, such as our water soluble 3D resins for printing sacrificial molds and other high tech applications, which need specific and more detailed protocols and instructions for use:
Most of our 3Dresyns are photopolymer or light-curing resins which have been designed for printing them with SLA, DLP, LCD and Inkjet printers working with lights from 200 to 420 nm and higher upon request, including wavelengths at 385 and 405 nm.
The following tuning instructions will ensure that our 3Dresyns print with maximum resolution and detail in your specific printer and print settings:
The final physical and mechanical properties of any 3D printed material depend, among other things, on the printer specifications and print settings, such as wavelength, power, exposure time, cleansing protocol (chemicals used for cleansing, time and temperature used during cleaning, etc) and light post-processing or curing (wavelength, power, post curing time, temperature, etc)
Control of post processing conditions is crucial for getting maximum performance properties, safety and biocompatibility.
Therefore it must be ensured that the light curing unit is in good condition: protocols for light power monitoring are required for professional printing. Temperature control of the light box is highly recommended as the one recommended in this link:
3D print cleaning process: Cleaning 3D prints
Our Cleaning Fluid Bio is ideal for removing any uncured 3D resin from the surface of the prints. Rinse 3D prints in our Cleaning Fluid and use a brush to remove any uncured resin from the prints. An ultrasonic bath can also be used for improving the cleaning process (typical settings: 10 minutes at room temperature with our Cleaning Fluid).
Light post-curing of the cleaned prints can be done in a clear glass or plastic container filled with our Cleaning Fluid.
A long light postcuring is recommended for ensuring that the printed material is cured to its maximum degree:.
Optimum light post curing conditions:
- a minimum of 1 hour light post curing
- temperature: from room temperature to a maximum temperature below 50ºC
Chemical post-curing (optional, ideal for biocompatible systems)
Chemical Cleansing by "burning out" of any non-biocompatible components, such as unreacted monomers, photocatalyst, residuals and by products can be done with our Cure tester and Purification kit.
Cure Test (optional step just for monitoring the degree of cure)
The cure test is based on the application of a drop of our Cure tester on the surface of the 3D printed material (exposed surface). After 5 minutes, the liquid can be removed and cleaned for a visual evaluation of the chemically exposed surface. When there is no color difference between the exposed and the unexposed surface, the cure is complete (full conversion from liquid to solid resin), reflecting that there is no residual unreacted resin and that the material it is safe for use. In practice, 3D prints immediately after printing never fully cure 100%.
Normally, there is a large color difference between the chemically exposed surface (which became brownish) and the unexposed surface (original reference color of the 3D printed material), indicating the existence of a relatively high concentration of unreacted resin, and that the material is not completely safe nor ready for use for any type of biomedical application.
This basic, easy-to-use test is ideal for monitoring the cure of any 3D printed material and it is particularly useful for quickly and inexpensively testing the safety of any 3D printed biomedical device.
A fully reacted 3D printed material can be visually identified when there is no increase in coloration of the exposed surface versus the unexposed print. This qualitative test can be calibrated to be quantitative using reference values.
Chemical Post-curing and Purification (optional for maximising biocompatibility and pass with "honours" the cytotoxicity and residual free monomer ISO tests)
Our Cure Tester can also be used as a post curing chemical agent because it chemically reacts with any unreacted resin residuals and by products, etc.
This is easily done by dipping the 3D printed material into a flask containing the Cure tester for 5-10 minutes at room temperature.
Any residual brown color on the prints will disappear when cleaned with our Purification Fluid (by dipping the prints into a flask containing the Purification Fluid for 5-10 minutes at room temperature) to eliminate chemically any brown residues and by products from the prints.
The prints must then be rinsed, at least twice, in water or in our Cleaning Fluid to remove any remaining Purification Fluid left on the surface of the prints.
After the post-curing and purification process, the prints will be fully cured, safe and ready for use in a total time of 10 to 15 minutes.