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[Bluecake]

Sourcing and building my own reprap was a big challenge but everyting is working ok. Now is learning howto make my own objects with 3d software the biggest challenge I'm facing.

[YosemiteSam]

It is difficult to design and print in the first try some mechanical parts that fit together perfectly.

[jestar9]

3D design software, Slicing Software and optimal placing of models for printing.

[barto]

understanding the limitations of different technology (FDM vs laser sintering). learning to work with different machines tolerances

[Catrinisin]

The software is crazy if you have never used something like this. There seems to also be a ton of small idiosyncrasies to deal with. Not saying it isn't all fun, cause it is!

[cwmain]

As a person with no engineering background whatsoever, everything is the most difficult thing about it to me!

[Adalay 3D]

Metal printers and 5 axis printers. Would really love to see those in action so I can become more familiar with how they work.

[Redgeneral]

What clearance is needed for parts to fit together - able to be inserted together but still remain tight fitting

[wpilgrim]

It is hard to pinpoint one aspect. It was definitely a learned process. Through tweaking my machine, upgrading various items on it, banging my head on failed prints, scouring forums. Multiple tweaks, and lots of Ah-hA moments have taught me a lot and I am still learning... Currently learning the intricacies of flexible filaments

[curious_spark]

calibration and maintenance for your 3d printer.