There are LOT's of people out there with 3-D printers to hire. I am a member of numerous riprap forums. You send them your stl file and they will print it for a fee and ship you the part. That is usually about 4 times the cost of the plastic PLUS shipping. I'm trying to break even and keep the prices down. If I use a 3D printing service then the low cost idea goes right out the window. What I will do is sell the stl to the forum members who have 3D printers. I plan to do that once the orders slow down. My hope is to get my printer paid off this year and then immediately buy another with the long term goal of having 4 printers. 4 printers running around the clock is about all I can handle alone. Two would be going full time on my personal projects, and 2 printers would be for hire and that would be combined with my skills in 3-D computer modeling for people who also needed me to make the CAD and STL files. Those goals may be a little ambitious, but that is where I would like to be in 24 months. That is when I will shift gears are focus on making a profit. The mud guys unfortunately are my guinea pigs with making products and running a business. My profit will be all I will learn in this endeavor. I plan to use that to become profitable in the future.