Crossfit speed jumprope

thingiverse

Inspired by https://www.thingiverse.com/thing:1418129, this was created from scratch using similar concepts. It's slightly thicker than some users prefer; I also made a thinner-handled version that should be easy to find. Note that the back is designed for multi-material printing to achieve the logo, which is optional. The files "Phi," "Crossfit," and "Lehi" are the three parts of the logo. Load them as one part to print together; it's possible to print them together even with a single color if desired. Required components: * 2 M3x16 bolts * 1 M3x30 bolt (a variety kit of M3 bolts can be found at http://a.co/d/7SUsJXC) * M3 small diameter heat-set inserts (http://a.co/d/gAxFzHx) * 608zz skateboard bearings (same as used for most fidget spinners, ceramic works best but is pricier) * M3 grub screws such as these http://a.co/d/2DhKRuX (or a full kit at http://a.co/d/d2MvKb7) Our gym logo was added 'cause I'm easily amused that way; printed without the logo, it could be engraved with a name, stickers applied, etc. A name could also be remixed and added, or access the Fusion360 file at https://a360.co/2qALxym to create your own custom design. Edit November 5, 2018: After minimal use, I decided I didn't like the straight side angle; I wanted something different from a pure 90-degree angle. An alternative was found and added - RopeAnchor_keychain allows threading a small key ring through and then attaching the rope to it however desired. However, the plastic piece sticking out is the weakest point of the whole design and could break easily. To address this concern, I visited my nearest hardware store and discovered small eyelets with self-tapping threads that can be installed on the bearing. The RopeAnchor_eyelet file should be printed to thread an eyelet straight down the center after installation, which will reinforce the shaft and provide a point to attach the jump rope, allowing it to rotate in any direction needed. Photos were added showing the eyelet and the box containing the ones used - "everbilt #212 zinc-plated screw eyes." Update November 10, 2018: For those who find this insufficiently strong (I tend to over-engineer things as a rule), a "Steel Clevis Pin, 5/16" Diameter, 1/2" Usable Length" (https://www.mcmaster.com/98306A212) should do the trick as a standalone steel rope anchor. An updated version of the body was posted to fit the clevis pin, and a sheath was added to hold it in place. I've tested that it works but haven't assembled a full jump rope using the pin yet. Update July 15, 2019: This seems to work really well, but I strongly recommend using the clevis pin; the plastic hub just isn't strong enough for long-term use. The steel clevis pin works great, though.