Idea for Memory padlock

Memory padlock

A padlock that opens with a large number of keys 
but also records the unique number of last key to unlock.





This function is useful in shared resources with 

many users as it brings accountability and transparency.

Cad Exercises - Random Noun

Random Noun is - Needle
Shouldn't be to hard

rotate([-60,0,0])difference(){
rotate([0,-90,0])rotate_extrude($fn=30)mirror([1,1])intersection (){
hull(){
translate([2,0])square([60,2]);
square([0.01,0.051]);}
offset(-2,$fn=20){offset(2)
union(){
hull(){
square([1,.4]);
 translate([40,-59.6])circle(60,$fn=160);
 }

translate([3.5,-13.2])circle(14,$fn=160);
 }} }
translate([3.25,0])scale([6,1,1])rotate([-90,0,0])cylinder(5,0.4,0.4,center=true,$fn=20);
translate([3.5,1.4])scale([5,1,4])rotate([-0,0,0])sphere(1 , $fn=30);
translate([3.5,-1.4])scale([5,1,4])rotate([-0,0,0])sphere(1 , $fn=30);
translate([2.5,1.8])scale([6,1.7,0.7])rotate([-0,0,0])sphere(1 , $fn=30);
translate([2.5,-1.8])scale([6,1.7,0.7])rotate([-0,0,0])sphere(1 , $fn=30);

}