Quest for Support 3

Here we proudly present the first simultaneously supported DIY 3D-Model.
It was printed by Domonoky to test the software for the dual-extruder of his Repman.

Unfortunately he had to stop the print half way - it was ment to be a model consisting of a small ball caged in 2 bigger balls with holes in them.

To check the surface of this test-model he gave it to me for dissolving the PLA.

The same procedure as last time. First heated in a waterbath and then put into the ultrasonic bath. First, I tried it with the already used chemical solution. Because of the green colour one can easy see, if it is still working.

before                                                                                                             after

A sedimentation of the green color can be observed - probably the colour adsorbs to the Lactose-salt.

After the first 35 minutes the solution was changed with a new one, wich was heated up to 70 °C.
75 minutes later the PLA was nearly totally dissolved and 135 minutes later it was finished.

after 35 min                                                                    after 75 min                                                                 ... finished!

I needed 100 ml of partly used solution and about 2 and a half hours to dissolve 5 g PLA.
In the pictures above you can see that the used chemical solution is still working, but not as good as a fresh solution.

Now it's up to Domonoky to print a complete caged ball or to show me how to print it with my dual-mendel.

...and it's up to You to build a second hot-end for your Reprap!



Quest for Support 2

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.


More Articles...

  1. Quest for Support 1