There was a research item to allow you to craft Tier 2 Science Packs, but there doesn't seem to be any research to enable the tier 3 science packs and some of the research items now require them.
How to create tier 3 science packs in Factorio
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Best Answer
As of version
0.15.70.17.60, the recipe forScience PackChemical Science Pack is:13 Advanced CircuitsElectric Mining DrillSulfur12 Engine UnitsBatteries (as well as the Filter Inserters) are no longer needed for making them. However, you will still need oil in order to make the Plastic Bars needed for the Advanced Circuit. The Engine Unit also requires Steel Bars, so you will now need to consider a steel bar supply in order to produce these science packs.
As stated in the other answer, you will need to put quite an effort into making these science packs. In my opinion, the current recipe makes it even more difficult to make these science packs.
There is a very handy website I found that shows the Research Tree as of
0.15.80.17.79. You can click on the "Chemical Science Pack" technology and it will show you the exact things you need to research and in what order to unlockScience Pack 3Chemical Science Packs. Currently, it is:Once you research Chemical Science Packs, you will be able to craft Science Pack 3's them.