Tonal Mat Wall Hanger

UPDATES WITH V5:

Strengthened Spring posts

• the triangular spring posts have been thickened for strength.  Made associated increase in size of hole in cam.
• more clearance in spring cavities that interface with housing posts.

----------------------------------------------------------------------

UPDATES WITH V4:

Fixed error in V3…

• V3 spring could “float” in housing.  This led to uncontroller cam position (translation instead of rotation).  New pins added to housing and holes added to springs.
• also updated cam teeth from V3 to be a little less aggressive

----------------------------------------------------------------------

UPDATES WITH V3:

Some more improvements…

• Made teeth even larger with a bigger gap between to improve grip on mat.  filleted teeth ever so slightly so not as “sharp” into the mat. 
• No “pins” required for assembly.  Instead of the cam is held in place by a combination spring/pin component.  NOTE: i'd recommend printing the springs in PETG as PLA can take a “set” and make the springs less effective over time.
• The spring/pin has a triangular ‘axle’ that interfaces with a 6 sided star hole in the cam.  This allows for customizable spring force as you can torsion the spring in 60° increments now.
• made the main body 2 pieces for ease of assembly.  NOTE: both should be printed with support just for the shoulder sections of the holes used for bolt/nut mounting. 
• Only additional hardware needed is an M5 bolt by 20mm or longer + an M5 nut.  You can still choose to glue the assembly together (there is a nice “lug” that fits into a cavity that can be used to increase glue surface, but i wanted a design that i could take apart.

----------------------------------------------------------------------

UPDATES WITH V2:

I noticed the strength of the cam wasn't super strong and occasionally the mat would drop.  I made the following changes in V2:

• increased size of teeth on cam.  These might leave small marks on the tonal mat, but are small and near the edge.
• increased thickness of spring.  Note that the spring should be installed such that “unlocking” the cam will unwind the spring.  This is typically opposite a standard torsion spring.
• The geometry of the frame has been updated to accomodate the slightly bigger spring.
• The geometry of the springs, cams, and bolts now have chamfer geometry to ease installation, particularly when blind.

----------------------------------------------------------------------

My first model submitted to Maker World!

This allows me to hang my tonal mat (1cm thick) to the wall.  I was tired of draping it on other furniture or equipment when not in use or rolling it up.  This allows it to hang flat so it doesn't curl up when laid on the ground.  

It functions off the principal of a rock climbing cam using a log spiral shaped cam which maintains the angle at which it contacts the mat, regardless of how much thick the mat is (up to limits based on size of mat).  This model was optimized for a tonal mat, which is thicker and softer than a standard yoga mat, so your mileage may vary if you have a different mat.  

It is completely printed, no other hardware needed.  The printed torsion springs provide some spring to the cam, so that hanging is a one handed maneuver (just slide it up and the cam grabs the mat).  Removal is just as easy - flip down the lever on the front which releases the cam and the mat comes free.  

For assembly, the only thing I did was drop a couple drops of CA into the ‘cam’ so when the bolts are inserted they stay in place permanently.

Assembly is a little awkward, I probably could have designed it to make things a little easier, but figured it was good enough since it's a once and done type thing.  Be careful the orientation you insert the springs to make sure the mechanism is sprung toward the closed position.  Also, the cam should be inserted such that in it's “rest” state (with the springs) it is oriented with release lever directly up.

Enjoy!