Since it's hot summer, my rattos also got a cooling mat (ought to be consumed immadietly, though) and a ceramic plate meant to cool down in the night and provide some relief from heat during the day.
The hammocks are sewn and done by myself and my girlfriend with a standard kit using second hand blankets (to be more eco-friendly) and old clothes.
OC New rat cage setup! Now with DIY homemade hammocks.