Molen 'De Vlinder' in Deil is a historic post mill, primarily open for public viewing on specific days, such as National Mill Day (usually in May) and select Saturdays, often manned by volunteer millers. While typically free to enter (donations are welcome, and flour might be available for purchase), visitors should check local schedules as daily access is not guaranteed, and private visits may require an appointment. The interior of such traditional mills often involves steep stairs, limiting accessibility for those with mobility challenges, but the exterior grounds are generally accessible. A typical visit to experience the mill's workings and learn about its history lasts around 30 to 60 minutes. Visitors usually explore at their own pace, with millers on hand to provide insights.