I love to build K’nex ball machines, and I have been building them for a few years.  Here is a list of some that I have built.

• Ball Machine in the Dining Room: Never Finished

• Crazy Moment: Never Finished
• Crazy Double: Finished. It was a combination of a Big Ball Factory set and a Trampoline Tower set.  I connected them with tubes from the Big Air Ball Tower set.
• Trampoline Factory: Never Finished

• X-Tower: Finished  (See this post)
• Grid Machine: Finished (See this post)
• Grid Tower: Finished (Only took me about a week to build) (See this post)
• K’nex + Marbles: Finished (See this post)
• Into the Treetops: Finished (See this post)
• Balls That Play the Piano: Failed (See this post)
• Rolling Illusions: Finished (See this post)
• Concatenation: Finished (See this post)
• Grid Tower II: Finished (See this post)
• Rujebime: Finished (See this post)
• Ribdul: Finished (See this post)
• Ruhurgin: Construction in progress.

I think Ball Machine in the Dining Room was my tallest ball machine for around two years.   Then came Grid Machine which beat my record.  Grid Machine almost touches the ceiling.  The highest point on Grid Machine is 1.5 inches (4 cm) from the ceiling. Then Ribdul beat my record again. Its highest point is 3/4 of an inch (2 cm) from the ceiling!

-Knextus