I am printing this object and need quite a lot of copies so printing

3D Printing
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1

I am printing this object and need quite a lot of copies so printing time is critical
Any way I can improve print time by altering the object? Quality is less critical and I use PLA 1.75 mm and CURA
https://www.dropbox.com/s/zgjh9jf186ap6l1/big%20box.obj?dl=0

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Reducing infill will speed up your printing some but not too much and will also weaken it. Depending on your printer, you can bump up printing speeds but will need to test it and make sure the print quality still works for you.

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@Fen11 is right purely from a printing standpoint. Since you need a lot of copies and quality isn’t critical you should get a larger nozze and use thicker layers as well.

From a geometric standpoint there are a few things you can do. Change the holes on the sides to hexagons with flat edes vertical, this will prevent the machine from having to go slower on the steeper overhangs and bridging required for the circle. I’d also recommend filleting the inside corners of the posts; because of the way the model is currently the printer won’t get up to full speed in those acute concave corners, filleting will allow the printer to stay at higher speeds. Chopping off the text would also help but I assume that’s out of question.

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Out of curiosity: what is it and what is it for (and what does it say)?
How many do you need and do they have to be 3D printed? Could you make a master and a mold and cast them from something like silicone or sugru or plaster or…?

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i use it for energy demonstrations in school. It is generic box and I have different lids for different kits. By many I meant around 25 only

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I assume the square holes in the corner posts are for mounting the lids. If you could use round holes, then printing the posts without the holes and drilling them afterwards would probably save time overall. This is in addition to @Adam_Steinmark 's suggestion of changing the shape of the posts to get rid of the small inside corners.
You did not comment back about the potential for making a mold.

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cheers
Do not see a point in making mold for 25 pieces

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@Kleinfeld_Technical I’d be wary of drilling the holes. They’re deep and unless you use 100% infill (which will take more print time) you’ll be drilling though sparse infill. Making the holes circular would help.

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@Adam_Steinmark We don’t really know what the holes are for, but I am assuming that they receive pins from the lids. If they are just locators, then it may not matter if the hole breaks into empty space. I do see that they are full depth. That suggests another time saver - use shorter pins and shallower holes.

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@Kleinfeld_Technical I would say the latter is the best option.