This part is not designed by a professional, use it at your own risk.

Because I'm not using a top rack in this configuration it leaves the tops of the poles exposed and it's a potential hazard. I wanted to add some padding that holds itself in place. Really this is just to stop me from whacking my arm on the top of the pole.

There is a small hole in the middle of the object to prevent vacuum seal. 

Print out of TPU. You can use a 0.4 or a 0.6 Nozzle.

In the pictured example I used Filaflex 70A ‘Ultra-Soft’ printed on a Prusa MK3S+ with a Revo 0.6 Nozzle. 

Bonus tips for printing 70A on a Prusa MK3S+:
Keep the speed ~20-25 mm/s
Heat the nozzle to 245c
Use a 0.6 nozzle
0.2 Layer Height
No Fan Cooling