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I used a MakerGear M2 3d printer. I did end up going with LiPos with a higher mAh rating for longer runtime. I found that as far as weed trimming string goes, the really thick kind for string trimmer mowers worked the best (longevity-wise). Ultimately though I did try switching to plastic blades and really liked it. Then I added wheels and basically used it as my lawn mower for the last half of the summer.
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I use Autodesk Fusion 360, my co-worker and friend who jumped in and designed the battery boxes and motor enclosure on this project for me uses SolidWorks.
DeathGrip: Robot Claw GauntletView Instructable »
Hi Jed, The short answer is "yes" it certainly would be possible. Just about everything you want is already there is some form. Adding that functionality would mostly be a matter of copy/pasting and making a few minor adjustments. An SPST (as opposed to a DPDT) toggle switch or rocker would be sufficient to toggle between two endpoints. Codewise it would be exactly the same as the latching pushbuttons. So you could simply copy/paste the code for the latching pushbuttons to add a third "button". Then you could simply modify the POSITION_CONTROL mode. The main difference is how the target is set (line 104). If the toggle switch is high, then you would set the target to position1, else you would set the target to position2.
Lightweight Weed WhackerView Instructable »
RC Fireworks TruckView Instructable »
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