This is a laptop stand that allows you to raise the screen to eye level and use an external keyboard. It is also stable and equipped with a 120mm fan for cooling....you do have to start with a cheap aluminum frame:
https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20170821222641&SearchText=laptop+stand
(scroll down to find the cheapest frame of the type used in the design)

Once printed, glue some soft pads on the front and possibly inside the grooves for the leg support if the fit is not tight or the legs turn too easily.

Without the pads, you may scratch the back of your laptop, especially if the back is a metal alloy.

Assemble with 3x M3x8mm screws + washers
Use 120mm Fan + grill for the cooling. Attach the grill only on the top of the fan with 2 self-cutting screws. Use the button holes to attach the fan to the assembly with 2x m3x40mm screws. You will need heavy duty washers here.

Print 2 tips for the legs. Pull off the plastic end caps that came with the frame (may need force) and replace them with the tips. Then glue the caps back with epoxy. Make sure that the tips can rotate freely, so they are not glued down too. Use padding on the back of the tips too to protect your hand rest on the laptop.

You can assemble and disassemble the stand in 3-5 minutes and it folds away neatly for travel.

The fan works off 12 volts. Use any electrical hookup that you have at hand. I suggest using a 6-9V DC source for quiet operation. 5V may not be enough to start the fan, so you will have to push it manually to start and it should keep spinning at a very low RPM.