Working Steam Engine Remix

thingiverse

I was impressed by the original engine (http://www.thingiverse.com/thing:25624) after printing it, but I wanted to make some changes. Here is my remix. It features a one-piece frame and tighter tolerances because today's printers are generally more accurate. However, if your printer is not calibrated or you're using incorrect settings, it may need a little filing to run properly. The engine can now be operated in both directions, and also serves as a water pump when driven by another engine. Update: 11/3/15, Last night I noticed that the intake port remains uncovered by the cylinder during the piston's exhaust stroke. To resolve this, I've uploaded an updated cylinder that keeps the ports covered at all times, even on the exhaust stroke. This version uses significantly less air volume but lacks the distinctive sound of the original design. If you prefer a more authentic engine noise, simply use the cylinder from the original model. I made this modification to enable users of weed sprayers to operate their engine with minimal pumping action. Update 11/5/15: The crankshaft bushing tolerances have been tightened for a snug fit directly off the print bed. Print Settings Rafts: No Supports: No Resolution: While high resolution is preferable, all prints can be worked with some sandpaper. Infill: I used 35% triangles with three shells on uni-body and solid for piston and crank. Notes: Update (11/9/15): For a power takeoff pulley, print the longer crankshaft and attach the pulley to the flywheel, positioning it so the rubberband clears the pennies. Additionally, I've updated the Flywheel for improved fit on the crankshaft, eliminating the need for gluing the pennies in place, but requiring you tap them with a wrench or small hammer. For parts handling air, they leak through their outer skin. To reduce this issue, use these settings for the main body, cylinder, and barbs: 4 shells Top and bottom layers should be at least 1mm thick; I'm using 8 layers (1.6mm) Post-Printing Instructions: You'll need two hose barbs and one of every other part. Then follow the instructions from the original model as they are very detailed (http://www.thingiverse.com/thing:25624): They might require some filing and sandpaper depending on your printer. Watch the video of this engine operating as a water pump at http://www.thingiverse.com/thing:1118992