Here we present the successful dissolving of PLA used as support for a 3D model printed with ABS.
The model we used is unprintable without PLA support. It consists of about one third of PLA and was printed with only one extruder inserting an PLA inlay during the printing process.
We used the same conditions as for the test dissolving reported last time. First, we needed a hot waterbath to heaten the solution.
After that we put the 3D model in the solution and mixed it with an ultrasonic cleanser.
About 10 minutes later we took a closer look at the object and like the first time you can clearly see the dissolving of the PLA without any harm of the colour or shape of the ABS.
The solution was heated again and put back into the ultrasonic cleanser for half an hour. You can see a YouTube-Video of the dissolving process here.
After that the PLA was almost completely dissolved, the remains of PLA could be easily removed manually.
You can see the final, cleaned object here.
As you can see it is easily possible to remove the supporting PLA of ABS/PLA 3D models at home within an hour. So this is proofed to be a good supporting solution for DIY 3D-printers.
The usage of an ultrasonic cleanser is not mandatory, but a good mixing shortens the dissolving time drastically. The same applys to the heating of the solution. Simple incubation overnight also works very fine.
The volume of the dissolving solution was about factor 20 in comparison to the amount of PLA in the object. It is no problem to touch the solution, but you shouldn't put your hands into it for a long time. After touching the solution you should wash your hands and you can even dispose it in the drain by flushing with water.