Hello, I'm looking for recycling solutions for scraps and used 3D printed parts
PLA type; ABS; ASA
If you have any leads, ideas, I'm interested because so far no solution except the trash 
Hello and welcome to this beautiful forum
I've already had the same thought and there are recycling machines, either ready-made or to make yourself (in open source)
It seems to me that Ariane Plast also offers a recycling service
For my part, being president of a 3D printing association, I have always wanted to be able to create a " service " for recycling 3D printing waste but it is a certain investment, I will ask @Coralie to sponsor us 
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There is also Polymix which recycles PLA and PETP (shipping costs at your expense).
https://boutique.polymix.fr/recyclage-pla-et-petg/
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Hello
It is also possible to create paste by soaking the waste in acetone baths.
The types of plastics must be sorted, and the acetone must be dosed according to the desired viscosity. A minimum volume will be required to melt the amount of plastic homogeneously, then add acetone (and let it melt again) to make it more liquid, or add plastic to make it less liquid.
To speed up the melting process, you have to grind the large pieces and make chips with the "intact" filament lengths (like when the spool breaks or those extracted from the extruder when they have stuck, or are the result of changing filaments)
The mixture must be made and stored in a resealable and airtight glass jar (jam jar for example); Acetone being particularly volatile, if it evaporates completely the paste will harden (but can be restored by putting acetone back in, except that you will have to wait again for the melting process, and will take much longer because it will be a block and no longer granules/chips).
You can then use these air-hardening pastes for different things such as castings, gluing, patching, plastering, etc. You can even paint with it if it is liquid enough.
With the right fluidity, it is useful, for example, to smooth out prints by filling in the interlayers.
Also works for melting acrylic (plexiglass).
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