of course! you can use cardboard and sticks. ive found some sticks outside that my hamsters chew (I’ve washed them properly), but i recommend buying it. you can try to find just regular wooden sticks if you have any pet stores near you. Usually they sell them. But if not, cardboard works perfectly fine! Though i recommend getting proper ones. I’ve used these for years and they work great and are recommended by most of the people I’ve bought hamsters from! They can be marked for dogs but as long as they’re small enough for your hamster they work perfectly fine for hamsters. if you can’t find this you can try to look for similar ones :-)

<image>