I designed this 3D printed cable holder to attach to the top of a Tiptop Mantis Eurorack case. It grasps the front and back edges of the case for stability. Cables up to 15" can dangle behind the case. The 10 slots can each accommodate 6 cables (assuming they're narrow like BoredBrain or LMNTL cables) for a total capacity of 60 cables. The case must be in the fully-upright position for the holder to work.
This listing is for a pair of cable holders.
Happy patching =D