Hi! I had the exact same cage for my roborovski pair (don't judge me I was very uneducated) but I've now switched to A bin cage for one and a zoozone for the other! They are both great options and The zoozone medium that I got takes up the same space on the set of draws (its wider however), while having much better floorspace due to it's shape.
The zoozone is actually a good option right now as it's £35 (I paid closer to £50 for mine), however with some hamsters the size may feel slightly restrictive (my robo spends most of his time in his nest or in his sand/wheel area so it works for him
)
The kaze is the box I used for my bin cage (I used a pyrography tool from hobbycraft to make holes to zip tie the mesh panel onto the box)
https://www.amazon.co.uk/Zoozone-620...upplies&sr=1-1
https://www.diy.com/departments/kaze...2249917_BQ.prd