Release compiled from chan.sankakucomplex.com rips can be found on rutracker:
sankaku 2014 (12.2013 - 08.2014) width>=1600
sankaku 2015 (09.2014 - 03.2015) width>=1280
sankaku 2015 part 2 (04.2015 - 09.2015) width>=1200
and covers rating:safe (except comic) and 20-25% of rating:questionable (none or minimal ecchi) pictures.
PNG converted to JPG (94% quality, \[PNG\] suffix), similar images deduplicated within several sequential months.
Files splitted monthly and across folders/archives less than 2 GB each, "q=questionable" images separately.
Newer dates range (2016) can be found at https://nyaa.si/view/875411
There is a lot more fresh rips at https://nyaa.si/view/1265063 and references from it.
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AlexPUA
SomaHeir