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I think the hamster heaven bar spacing would be fine for a fully grown robo but really not sure about a baby, I've only kept Russian & Chinese so can't say for sure.
Two problems with the HH cage though are you would have to use it without the tubes & penthouse (better that way anyway imo!) as those could cause territorial problems with a pair, it may also be too big for a pair, it would be a good size for a single robo but pairs do generally do better in smaller cages as there's less for them to get territorial over so they are less likely to fall out & need separating.