Motnik has made two solo albums that include instrumental songs varying in styles from melodic rock, jazz, and classical music.

Darkseed announced in August 2006 that singer Stefan Hertrich and bassist Motnik would leave the band and focus on their other projects.

The band toured in Southern California and made the album When Sparks Fly with Motnik in 2010.

Only shortly after moving to the US, Motnik joined Uli Jon Roth's (Scorpions) North American tour as a bassist.

After moving to Las Vegas, he started a site that makes it easy to work with other musicians worldwide.

[18] Motnik has worked as a studio musician with several artists playing many different styles, such as The Wrecking Crew's Hal Blaine (drums) and Don Rand (piano), Gregg Bissonette, Phil Campbell, Paul Sabu and Bruce Kulick, and Ralf Scheepers.

That's when both my desires are being fulfilled, my passion to record and my love to play out live and interact with other musicians and the audience.

[23] In February 2019, shortly after Peter Baltes had left Accept, Motnik moved to Nashville.

He joined the band just before the Symphonic Terror tour, and Motnik had a week and a half to learn the 22 songs.

[25][26][27][28] In 2005 Motnik made, in collaboration with drummer Gregg Bissonette, a solo CD Bass Invader.

The bass patterns of the songs run the gauntlet of tonal possibilities and vary from soft ballads and acoustic sections to fast bass-played bits that sound like a regular guitar, even though they aren't.

Guests on the album include guitarists Joe Satriani, Wolf Hoffmann, Bruce Kulick, Frank Gambale, Andy Timmons, Mattias Eklundh and Jennifer Batten, keyboardist Derek Sherinian and drummers Christopher Williams, Walfredo Reyes Jr., Joe Babiak, and Gregg Bissonette.