One of the popular 3D printing techniques is DLP (Digital Light Projection), in which a resin is being cured layer by layer using UV projections. This is a very accurate printing technology and results in detailed three-dimensional objects.
However, after printing it is required to remove the uncured resin. This can be a challenging task considering the fine details and openings of typical 3D models. Cleaning can therefore consume significant post-processing time, as we discussed before.
This example involves a Rapidshape S30L printer with MP300 resin. This is a semi-industrial 3D printer with a horizontal resolution of approx. 100 µm and a layer thickness of 25 µm.
The manufacturer recommends the following protocol for cleaning printed models:
- ~250 mL IPA in a glass or plastic beaker
- 3 minutes in an ultrasonic bath
- Blowing with e.g. instrument air
- Another 3 minutes in an ultrasonic bath with 250 mL of IPA in a beaker
- Cleaning of the beakers for next time
Total time: about 8 minutes.
- 50 mL IPA in a BuBble bag
- 1 minute in an ultrasonic bath
- Dispose of the bag and IPA
Total time: 1 minute.
Using the BuBble bag resulted in the same cleaning result as with the original protocol, using 10x less IPA and in 8x less time.
The owners of this 3D printer now use the new protocol that includes the ultrasonic cleaning bags.