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[moke1180]

What was/is the most difficult thing for you to learn/understand about 3D Printing?

The most difficult thing for me to understand about 3D printing is what is the most effective way to slice a part to keep its strength but use less material

[angelang]

Slicing, raft, and structure still get me.

[Dhalss]

Learning to use software to create 3D objects has been a challenge and still is to me. I have had no use for this kind of programs since school days in the ninetees...

[PlasticSpace]

The curing depth calculations for SLS systems.

[TheFinalCut]

Probably fixing errors in files. Tricky subjects like non manifold geometry, and also the concept of support and overhangs.
I had to send files back and forth to shapeways until their feedback got me both a good model and practical understanding.

[aul12]

Triying to design things which do not need support

[ottojo]

Adjusting the printer

[ahrinn]

Probably the properties of the different materials, such as which would be most appropriate for what projects.

[palawanisland]

different type of 3d printing technology, FFF, FDM, SLA, SLS, etc. which technology is for me.
different machine / model / design for FFF / FDM. what model is for me.

[plaetzchen]

Using CAD software to make 3D Models for printing.