Parametric Lost Marble Maze

This is a “Lost Marble” style marble maze based off of an old wooden toy I had as a kid. I have this designed for use of a run of the mill glass marble that I had lying around. It measures 15.5mm in diameter.   I have included the Fusion 360 file and have designed it with parameters for marble size, path spacing, and marble clearance as primary drivers.  However if you're feeling creative, you can adjust other parameters (such as path numbers) and create your own internal mazes.   

Traditionally this is made out of a wooden block with holes drilled in parallel along two or three sides.  Plugs are then inserted and glued into place to create an inside maze for a marble to be trapped in.  

It's meant to be deceptively difficult. Unlike most mazes, there's nothing to visually see. The tactile sensation of the marble weight moving along the races and colliding against the walls helps you visualize the path so you can solve it.  As such, the relatively simple paths become confusing when you don't know the pattern.  As a child I managed to solve this puzzle a few times, but it wasn't until I was an adult that I figured out the design after rediscovering it. 

Because it it is self contained and requires no visual attention it can work well as a fidget toy as long as you dont mind hearing the marble clattering around.  Speaking of which, i think it sounds pretty close to my original one. There's enough void space surrounding the paths to resonate the marble impacts. This might be fun to print in wood filament. 
 

Before Printing: Check your marble. I highly recommend a glass or metal marble (ball bearing).  Something with weight to it.  It's important for the tactile response to the puzzle and will drastically help you move it inside the maze. Roughly measure it's diameter.  If it is 12-15.5mm in diameter, then these files will work as intended.  If your marble is outside this range, I'd recommend tweaking the parameter in the fusion 360 file. The default print files have a 1mm clearance around my 15.5mm marble. 

Printing: Any materials will work just fine, please just make sure that stringing is at a minimum.  If stringing is of concern you may want to check on the print 2/3rds of the way though to make sure nothing is obstructing the maze.  I printed with default PLA settings 0.3mm layer height, 10% Rectilinear infill (for better top fill), 0.4mm nozzle.    

How to use: Take your marble, drop it in the hole, rock the puzzle side to side to make sure it falls into the next section.  Great.  Now, hold it with one of the large faces facing upwards and try to get it out. 

If you need help, reference the third picture for my default layout.  Keep in mind that the paths have no chamfers and require deliberate movements to change direction.  It can take some time to get back out, even if you know the maze. 

Choking Hazard: Please keep this puzzle away from children that may try putting this into their mouths.  While this puzzle at times can feel like the marble will never come out, it definitely can and can choke someone if they are surprised by the marble coming free.