Quoted from ThePinScientist:Anyone have a STL of the pipes that fit over the flashers?
I also added a bowser next to the castle. It was a $15 bowser on eBay. I cut his legs at an angle. Looks like his legs are inside the plastic ramp, and the ball travels between his legs. I like it!
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I think the pipes you asking for are done wit PVC.
Beside that i actually did designed 3D pipes with the mountings like on the question block. So they could be mounted direct over the bulb. I will check if I can find the file and upload it this week and share the link here.
Funny idea with bowser