Quote:
Originally Posted by Jon Stratis
This is the spool we used last year to pull down our catapult. It mounts on a 1/2" hex shaft. We printed it solid on our Makerbot 2x, and it worked perfectly the entire season!. Just print the two sides, stick them together, put the guide around the whole thing, and slide the shaft in. Use a bolt (I think it was a 10-32) through the provided hole to go through a looped end of a 1" wide nylon strap.
http://www.thingiverse.com/thing:254530
Obviously, it can probably be modified/adjusted based on your desired use!. We used a vex pro ball shifter with the optional third stage reduction and a single CIM motor to power it, mounting this right on our output shaft.
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We just printed this part and we're putting it all together now and it seems like it will work like a charm! Thanks for the help!