Finck left NIN in February 1996 in order to play for Cirque du Soleil in their ''Quidam'' show. [https://groups.google.com/g/alt.music.nin/c/Vb7EqVcXRAE/m/S3mTFzvyIocJ] Through early 1997, Finck, while continuing to work with Cirque du Soleil, joined jam sessions with Axl Rose and Guns N' Roses in a casual capacity, in the wake of Slash having departed the band in 1996. [https://web.archive.org/web/20170630060815/http://www.mtv.com/news/1429816/guns-go-clink/] He signed a two-year contract to join the band in August 1997, recording material for the ''Chinese Democracy'' album. Finck departed promptly at the end of the two years, in order to rejoin NIN in August 1999 as part of the live band for the [[Fragility]] Tour, and appears on the accompanying album/DVD, ''[[And All That Could Have Been (halo)|And All That Could Have Been]].''
Shortly after the NIN tour ended, he departed again and rejoined GN'R in October 2000 [https://www.heretodaygonetohell.com/news/shownews.php?newsid=297] and remained in the lineup for almost eight years, even turning down an offer to rejoin NIN in 2005. There was apparently some animosity between him and Reznor around this time, as Reznor discussed in the ''New Zealand Herald'' shortly before the release of ''[[With Teeth (halo)|With Teeth]]'': "Robin Finck [was] getting paid loads of money to hang out with Axl Rose and his house was getting paid for. You know what, fuck you." [http://www.theninhotline.net/archives/articles/manager/display_article.php?id=54] The grudge didn't last; on April 4, 2008, Finck's return to the touring lineup was announced via [[nin.com]]. He also remained for the [[Wave Goodbye Tour]] in 2009. In 2013, Reznor tried to shake up the live band dynamic with [[Adrian Belew]] and [[Eric Avery]], but they didn't work out during rehearsals. On May 17, 2013, Reznor announced via Twitter that Finck was back in NIN, stating that, "It just didn't feel like Nine Inch Nails without Robin Finck. Now it does."[https://twitterarchive.comph/trent_reznor/status/335425288580255744CfMZl]
Finck is a noted bird enthusiast, and his website discusses his fascination with them. Many NIN fans have noted after hearing of his avian fascination that many of his changes to NIN songs during the [[Fragility]] tour stems from his bird-sound-inspired choice of guitar tones and sounds. This is especially notable on the pre-solo section to "[[The Wretched]]" and "[[Just Like You Imagined]]." Finck appears in the [[Nine Inch Nails music videos|NIN music videos]] for "[[March Of The Pigs (song)|March Of The Pigs]]", "[[Hurt (song)|Hurt]]" (live), "[[Eraser]]" (live), "[[Wish (song)|Wish]]" (live), and "[[Into The Void (song)|Into The Void]]".