Laser Heatsinks

Hello All,

I am upgrading one of the 3D printers we run at my printshop with a laser engraver. We have a bunch of diodes we're testing (A140, M140, NDB7875) and would like to know what heatsinks will give us extended runtimes in the order of 30mins - 1 hour.

We're hoping to run the A140's at around 1A/1W and the NDB7875 at around 1.8A.2.5W. The lasers are in the copper aixiz modules currently and we already have a few of these: 12mm Holder Clamp Mount Heatsink Cooling Laser Module Pointer Lens Mirror | eBay

Or something very similar.

Seeing as the laser will be used for cutting and engraving it will be run duty-cycled, whereby it will be on for cutting moves and off for movements.

Any advice would be appreciated, I have no experience with diode lasers in order to guess at how hot they get, and what heatsinking is necessary.

Thanks!

Use a big heat sink if you are going to run it for that long. And a fan. Possibly more.

Thanks for the reply!

I'm looking for specifics though, do you have experience running either of these diodes over long periods ?

How "big" do you mean, did you take a look at my eBay link ?

I have considered a fan, and will add one if thats what the consensus is.

You posted a duplicate topic in general. I responded with some good advice based on hands on experience with long run times and heat sink types.

http://laserpointerforums.com/f44/heatsinks-runtime-91798.html