I made some custom parts for the marble castle made by BamBam: https://makerworld.com/en/models/60986?from=search#profileId-63193 Reasons for the mods: 1. The roof fell off often. I made the grooves of the room deeper. 2. I made windows on the house so that I can see the marble going through the house. 3. I made a tunnel through the house because I didn't want to have to rotate the house for the marble to continue rolling. 4. A spinner to replace the functionality of the knob