Balloon Powered Radial Engine Free 3D print model

cgtrader

Extra parts needed: M3x8 Bolts (x15) M3 Nuts (x15) Nitrile Gloves (thumbs from M sized gloves worked the best) or Silicon (worse) or PET (not tested) ones Optional parts: M3x12 or longer bolts (2x)(for the gears) M3 Nuts (x2)(for the gears) 6x4mm Silicon Pipe (can be found in aquarium shops) M5x10mm Washers (x2) (instead of printed ones) 105ZZ Bearings (x2) (noticed no difference in performance) Printed well with 0.6 nozzle at 0.2 layer height. Some parts (Cylider_Back_Lid and Valve_Lid_6mm) need supports. After printing cut away the brims from Cylinder_Ring parts. Parts with X_ in their names are optional. Assembly: Cut off a glove finger tip (thumbs from M sized glove worked well) Pull it onto a Cylinder_Ring (Use Helper_Finger to leave enough height) Connect a Piston to it with two Washers Clamp the Cylinder_Ring between Cylinder_Plate and and Cylinder_Lid Clip them with Helper_Clamp so they won't fall apart at once Bolt them together to Plate_Top Repeat for the other 2 cylinders Insert th Crank with 2 Washers Fix it in place with Frame_Bottom Bolt all the parts together Put the Valve_Inner in place Bolt the Valve_Lid into place The engine should be running! Troubleshooting: Jams on a certain cylinder - glove finger may be too small, and the cylinder washer is catching on it when passing the cylinder ring. Isn't rotated freely by hand - gears bolted too tightly to frame (should have a bit of play), some gear teeth didn't print very well, or the whole gear printed with elephant foot and runs too tight with another gear. Rotated freely by hand, but struggling under air pressure - the valve may have too much friction against the frame surface when pinned down to it by pressure (may help sanding the inner valve surface a bit).