Spring Motor Rolling Chassis Version 2

cults3d

An updated version of my earlier design (http://www.thingiverse.com/thing:430050), this version includes stronger spring and gears, weaker pawl, and o-ring tires for traction. The first photograph is of the actual prototype. The second photograph is a screen grab of the cad version. The final photograph is of JersyBeast's knob (see UPDATES below). Assembly video is here: https://www.youtube.com/watch?v=q_Jom7imnNw. Video of prototype run is here: https://www.youtube.com/watch?v=zo1t8SiTtTM. Video of JersyBeast's knob (see UPDATES below) is here: https://www.youtube.com/watch?v=vIy25mTT5O0. You will need to purchase two #18 o-rings (1 3/16" O.D., 15/16" I.D., 1/8" diameter) and two #111 o-rings (2 1/2" O.D., 2 1/8" I.D., 3/16" diameter), which are available on line, and at plumbing supply / box stores. Designed using Fusion 360, sliced using Cura 2.3.1, and printed in PLA on an Ultimaker 2+ Extended and Ultimaker 3 Extended. UPDATES: 1) Thingiverse member JersyBeast requested an "easier on the fingers" knob design and even provided a suggested for the new design. So I have implemented JersyBeast's suggestion and uploaded the result as "Knob and Axle (1).stl". I have not tested it yet, but I recommend printing it at 100% infill, and be very careful not to over-torque the spring using it as the spring or "Chassis Left.stl" axle could snap. @JersyBeast, hope your fingers get better! 2) Printed, tested and uploaded photograph and video of JersyBeast's knob.