The General Idea: I have an idea for a type of track-roller system for sliding doors that does not seem to be available anywhere..Present systems mainly use overhead tracking (hanging doors) which are klutzy, subject to failure and often need to be hidden with valences and other devices. You've seen their wheels and kits at Home Depot and such. 'Barn door' sliding systems are even more unsightly (despite mfgs. hype about how "artful" they are.). Bottom sliding systems require attaching wheels & hardware to the bottom edge and/or side of the door itself. Also klutzy. In many situations, these solutions can be nearly impossible to install. My idea returns to a simple but effective method of making sliding doors slide easily and quietly. Imagine a familiar item - the kind of common roller tracks that are often used to slide packages from a warehouse dock onto a waiting truck, or carry items along an assembly line. Two rails joined by a series of cylindrical ball bearing rollers. The rollers can range from, say, 1.5" to 3" in diameter, and the supporting rails from 2 to 6 inches high. The distance between rails can range from a foot or so, to 3 feet or more. Generally these conveyors are made out of steel. Now, imagine those rails reduced in size to a miniature track-roller system, a channel about an 1.5 inches wide with side rails 3/4 inches high and rollers about 5/16" in diameter. The rollers might be covered with a sleeve of nylon (for silent sliding) or even made of nylon if it was tough enough to withstand the weight of the door ( 40-125lbs) with little distortion. The sides of the channel ( "rails") might be nylon channel might be about 1" to 1.5" inside width and a 3/4" height, punched for accepting miniature ball-bearings (which are commercially available). That's the general idea - a channel track with 'pin rollers' that could be embedded in a 3/4" dado in a wooden floor. The Proposal: Sorry, but I have no skill-set for either designing this item, modeling or marketing it. Nor could I afford much to pay for it if it could be 3d printed (except, perhaps for the bearings which would have to be bought separately and assembled)). I'm a poet and we don't much operate in the world of enterprise (or wealth). Still if it's a worthwhile idea, perhaps one of you would like to take a crack at it? You'd have to design and do the project, secure the patents and market it to some manufacturer. A small cut for me would be nice. That's the idea. If you think it's something you could do and would want to take it on, let me know and we can talk it. I think it represents a good opportunity for someone with the right skill-set. Why This - Where the idea came from: I was building some Shoji Doors for my home porch enclosure (see below) and tracking became a central issue. Nothing on the market would work in my situation and I discovered the things that I imagined might work did not seem to exist. I did finally handcraft a wooden track lined with HDMW tape. It works ok - but isn't ideal, especially with changes in weather, tape wear and such. The 'miniature roller track' seemed the best solution to the problem.