You can either buy an el-cheapo laptop cooler from market , which shouldn't cost you more than 300-400 bucks.
This is to because , they will have a firm plastic body , which will be durable and sturdy along with the various angles you can have for the laptop stand.
I went to Nehru palace in Delhi , and picked a replica of one of cooler master's cooler , which allows me to pack at least four 80mm fans easily. It cost me just 300rs.
*www.dvhardware.net/news/2010/cooler_master_ergostand.jpg
This has ample room to fit many fans.
So , in short WIM is that buy a cheap chassis from market which has ample room and if possible a variable angle stand.
After that , you have to make adjustment into the cooler's body.
1.First of all replace the stock fan from it , since it's of no use as such. I.E. if you'll power them with higher voltage they'll smoke out.
So remove the stock fan ,
2.and now , according to the vents beneath your laptop , and the areas where heat generation is high , lock those 80-120mm fans that you have . I would suggest you to drill holes, or use hard glue like fevi-kwick , to place those fans firmly.
3.Now , after you have placed all the fans accordingly , you have to take a sharp knife, razor and cut large opening for the inlet vents , so those fans can draw as much air as possible.
I would suggest you that cut as much plastic from beneath those fan blades as much possible. Just make sure , you leave the plastic part intact to which the fans are connected.
4.After doing all this , connect you fan wires accordingly. I.E. if you want all of them to function as air-blowers then add them in that way. If , you want some of them in exhaust mode to throw hot air out ,( in case if you have an exhaust vent beneath you laptop , which is rare.) then put them in exhaust mode.
5.Now , after connecting all the wires , properly.You have to use a manual switch ( buy a switch from market ) and place it in the path. Fans--------/switch/.-------
owerSource
This is to ensure that you just have to turn off the witch , in case if you want a silent environment and don't want to do performance intensive tasks on laptop.
6.Now , depending on the ratings of your fans , ( most of them are 12v fans.) , use a powerful adapter.
I am currently using a laptop power brick , which I bought for 250bucks from market , ( you can borrow it from somehow , whose laptop has gone kaput.)
It provides a steady 19v supply , to four 80mm 12v fans connected in parallel. Most of them run at 2000rpm at 12v , but at 19v , then go somewhere around 3000-3500rpm,
Providing higher power supply can damage your fans , but mine has been running like 24x7 most of the time , from past an year at least. Since , my laptop always is busy in doing something or the other.
Only the power brick had gone kaput few months back , other than that everything is stable.
7.I would also suggest you to use a rheostat/voltage regulator in the path as this will help you control the speed of the fan , just in case if you need lesser cooling and quieter environment at times.
Most, important thing is to ensure that fans are placed properly , and they have good openings fro air-intake and , must be running at high speed.
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In case , if you don't want to buy a cooler chassis from market , then you can use the box/carton ( the laptop carton/box which you got when you bought the laptop.)
Stick the fans accordingly , and cut the vents properly. Join wires , properly.
