This ends up with an auto-detected dependency on

libArcus.so.3()(64bit) which is satisfied by libArcus3-lulzbot and libArcus3.

Assuming there is a reason to have both libArcus3 libraries (which are conflicting, properly set in rpm metadata), and the both libArcus.so.3 are not abi compatible, I suggest to:

• At least explicitly require the libArcus3-flavor you need here
• even better, have the soname changed of libArcus3-lulzbot flavor, so that there is no confusion; as a side effect, they'd not longer conflict (don't just rename the file, but really change the library name)