The window underneath your resin tank protects the projector mirror and sensitive internals from debris and resin spills.
If it is smudged, scratched, or otherwise obstructed, this can cause serious issues with your prints. The best practice is to check your optical window for obstruction every time you remove the tank to ensure successful printing. If your optical window needs cleaning, follow this simple procedure.
Remove the build platform
To clean the optical window, begin by removing the build platform by turning the red knob to the 'unlock' position, then pulling the plate toward you until it slides fully off of the build arm.
It is very important to remove the build platform first, to avoid dripping resin onto the optical window!
Remove the resin tank
Next, remove the resin tank from SprintRay Pro. For detailed instructions, review our resin tank usage page.
Inspect the Optical Window
Smudges or dust can be invisible in normal lighting conditions, but they can still impact your prints! See the below images for an example of this:
SprintRay Pro's Optical Window in normal lighting conditions
SprintRay Pro's Optical Window with a light being held at the correct angle.
These images were taken on the same printer, moments apart. Proper lighting is critical to inspecting your optical window!
To check your optical window for any kind of defects, hold a light as shown in the below image. The low angle will illuminate any possible defects to be cleaned. Confirm the cleanliness of your optical window by holding the light at this angle from all four sides.
Use IPA on partially-cured resin
If your optical window has bits of cured resin on it, begin by thoroughly spraying the glass with IPA 91% or greater. Wait a minute to allow the IPA to break the resin down, then proceed to wipe with a soft cloth. Repeat this process until the optical window is clear of all cured bits of resin. Note that, depending on the amount of resin cured to the optical window, it may take several passes.
Use glass cleaner
Once all resin has been cleaned from the optical window's surface, spray with standard glass cleaner such as Windex and use a soft cloth to clean away fingerprints or other smudges/imperfections. Ensure the optical window is dry, then inspect it again as detailed above. When you have confirmed it is clean, you can then return the tank to its cradle.