Ich hab mich an die Maße gehalten. Das Meiste vom Code war zum Glück Copy&Paste.
Ich hoffe, ich konnte dir helfen!
difference (){
cube ([108, 161, 3]);
loecher ();}
module loecher (){
translate ([15, 15, 0]){
cylinder (d=3, h=4, $fn=10);}
translate ([22, 32, 0]){
cylinder (d=3, h=4, $fn=10);}
translate ([22, 42, 0]){
cylinder (d=3, h=4, $fn=10);}
translate ([22, 52, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([22, 62, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([32, 32, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([42, 32, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([52, 32, 0]){
cylinder (d=3, h=4, $fn=10);}
translate ([62, 32, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([32, 42, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([42, 42, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([52, 42, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([62, 42, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([32, 52, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([42, 52, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([52, 52, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([62, 52, 0]){
cylinder (d=3, h=4, $fn=10);}
translate ([32, 62, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([42, 62, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([52, 62, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([62, 62, 0]){
cylinder (d=3, h=4, $fn=10);}
translate ([72, 62, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([72, 52, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([72, 42, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([72, 32, 0]){
cylinder (d=3, h=4, $fn=10);}
translate ([32, 22, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([42, 22, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([52, 22, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([62, 22, 0]){
cylinder (d=3, h=4, $fn=10);}
translate ([32, 72, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([42, 72, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([52, 72, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([62, 72, 0]){
cylinder (d=3, h=4, $fn=10);}
translate ([78, 15, 0]){
cylinder (d=3, h=4, $fn=10);}translate ([78, 75, 0]){
cylinder (d=3, h=4, $fn=10);}
translate ([15, 75, 0]){
cylinder (d=3, h=4, $fn=10);}}