I think if you're worried about bars though a tank style might be better - the only thing I know bigger than a zoozone would be a 4 ft tank or a detolf really in tank style things (maybe a used aquarium on ebay). Either of those would need a mesh lid though. Tricky! (Sorry just realised you said zoozone 1 so 100cm would be bigger).
How about the maxi duna multy? (It's the size of the zoozone 2 but has less than 1cm bar spacing - not sure exactly what the bar spacing is - about 8mm I think. Freyashamsters will know, she has one
). Only thing is they cost £70 to £80. Looks like there's a used one for sale on Amazon though for about £42 but then you'd have postage on top. Maybe no postage actually - it's an Amazon Warehouse deal. I think that would be a great cage for a robo if you don't mind top access - and no meshing.
https://www.amazon.co.uk/Ferplast-Ma...axi+duna+multy