Hello,
Sharing my project of modular jump bar for rabbit agility. I'm using it with my bunny and he's very happy and recommends such a training.
Whole jump bar is 30cm high, but it can be adjusted. Steps are set at each 5cm, base is 20cm and top-part is 10cm so you can set it between 5-30cm, and if you need it even higher you can just print 2 more “Frame-bottom” and 2 “Frame-holder” parts to expand it for next 20cm.
It contains many parts, most of them fit on one plate, but the sticks needs to be printed separately due to it's size. File with stick needs to be scaled, depends on your needs and printer's possibilities.