Hi guys! I'm just about finishing up a new project of mine: a film dryer for Paterson reels. The tunnel is modular, and you can print out parts to accommodate as many reels as you'd like. The tunnel uses a standard 80mm computer fan and filter - should cost less than $10 on ebay. If you cant find a filter, I guess you could put the whole contraption in a sealed plastic bag to recirculate clean air, or put a stocking over the fan. You also need a 12V DC source to drive the fan. The design uses three interlocking parts: 1. The lid, that houses one reel, the fan and filter. 2. The middle part, houses one reel - print as many as you need! 3. The bottom, has exhaust holes and has a trench that'll collect excess water. I've fast printed a prototype, and everything seems to fit, but I'm sill waiting for the filter to arrive before I can do a live test. The STL files can be downloaded from here: https://drive.google.com/open?id=1Z8RbaoYCpDqB1QcpXgLIrO95G8jFqkE9 Please let me know what you think!