I converted the Roomba ramp from drdentz for Fusion360 and extended it by 10mm in height for my Bedroom.
I also added the F360 file for anyone that wants to modify it.
Notes:
Printed in 2:33h with a 0.6mm nozzle and a layer height of 0.3mm.
Keep in mind to print it with the top side flat on the build plate for the best result.
Printing it vertically without supports might work, but the bridging around the upper screw holes might mess up the holes, though you can always file it down and re-drill the holes if necessary.
That way you could print multiple ramps in one go but you'd have to do some post-processing. You could use some supports for the upper screwholes to prevent the drooping.
The author remixed this model. Imported from Thingiverse.