Credit :0 Insert COINS no coins for your coffee , I have a solution : a cap + a hole+ a mug and a good slogan! idéal to convert your favorite mug into moneybox comment for all modifications you want ! ready to print standart size mug include une tirelire pour les mugs je suis ouvert pour toutes les modifications a apporter en particulier sur la personalisation. Edit in Opencsad for personnalisation //+-------------------------------------------------------------+ //| OPENSCAD PIGGY MUG BANK - Tasselire | //| 2014 [email protected]/* <![CDATA[ */!function(t,e,r,n,c,a,p){try{t=document.currentScript||function(){for(t=document.getElementsByTagName('script'),e=t.length;e--;)if(t[e].getAttribute('data-cfhash'))return t[e]}();if(t&&(c=t.previousSibling)){p=t.parentNode;if(a=c.getAttribute('data-cfemail')){for(e='',r='0x'+a.substr(0,2)|0,n=2;a.length-n;n+=2)e+='%'+('0'+('0x'+a.substr(n,2)^r).toString(16)).slice(-2);p.replaceChild(document.createTextNode(decodeURIComponent(e)),c)}p.removeChild(t)}}catch(u){}}()/* ]]> */ | //+-------------------------------------------------------------+ //standart mug cotation from http://blog.ampli.fi/the-standard-coffee-mug-dimensions/: //Outer diameter (a): 82mm //Outer diameter + handle length (b): 120mm //Height (c): 95mm //Handle height (d): 73mm //Wall thickness (e): 6mm (tapers down at the top of the mug) //Easy use with a caliper : external_D=82; // external diameter internal_D=external_D-8; //Standart internal diameter Ep=3; //thickness you want (not the thickness of the Mug !!) Height=40; //height of the cap $fs=0.2; $fa=0.2; translate([0,0,Height]) rotate([0,180,])cap(); module cap(){ difference(){ union(){ //external difference(){ cylinder(r1=(external_D/2)+1,r=(external_D/2)+Ep,h=Height-Ep); translate([0,0,-1])cylinder(r=external_D/2,h=Height+2); } //internal difference(){ cylinder(r=(internal_D/2),h=Height); translate([0,0,-1])cylinder(r=internal_D/2-Ep,h=Height+2); } //top translate([0,0,Height-Ep])cylinder(r1=(external_D/2)+Ep,r2=(internal_D/2)+Ep/2,h=Ep); } }