Zesty Nimble Effector For Ultibots K250 Delta

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Zesty Nimble E3D Magnetic Effector for Ultibots K250 Delta Printer with "Berd-Air" Style Cooling. Edit: I've got my Nimbles and have one up and running, so it's verified to work. I designed it using the Nimble documentation. Also note that there are some defects in the STLs generated by FreeCAD but I was unable to correct them with FreeCAD or Meshmixer without messing up the mesh. They printed without any hiccups with KisSlicer-generated G-code. I used support at 88 degrees setting in KisSlicer to have support inside the E3D area but not inside the mag ball nut areas. I've verified that after one hour at 250C with the silicone sock in place, the E3D cooling fins were cool to the touch and no damage or softening of the PETG I printed it with was evident. I limit my K250 to a 115mm print radius so it's untested for the complete 125mm radius. I slightly undersized the holes for the mag balls and the cooling tube on purpose because I like to use number size bits to clean up the holes to size on my prints. The pictures show the PTFE tubing long and not cut to length for the Nimble since I don't have one yet. Designed to be used with the small adapter ring that comes with the Nimble. Ball spacing is 43mm. I kept the ball mounts in a tight radius to minimize effector tilt. Due to the tight radius, the rods (I've printed ones so no clue on the clearance of the nylon ones) barely cleared the top fan mount screws at worst-case angles, so I recessed them by clearing the fan as can be seen in one of the photos, although I don't think it would be absolutely necessary. There are two different files for the top part "Nimble Mount" that holds the E3D V6 stationary and that the Nimble mounts to, one for left and one for right side placement of the drive cable. The M3 nuts that the Nimble mounting screws tighten to are pressed into the top part before attaching it, and once the top part is attached, they're restrained from going anywhere by the effector. You'll want to press the M3 nuts in place, insert the E3D into the effector, slide the "Nimble Mount" over the E3D groove, attach the "Nimble Mount," then the Nimble goes on. I don't know if the M3 bolts that come with the Nimble will be too long or short. I used a couple of self-threading plastic screws from some old RC servos to attach the "Nimble Mount" so I don't have a spec for them. I used M3 nyloc nuts for the mag balls as it's extremely easy to strip the threads with standard M3 nuts. They're a tight fit, and I used a smaller diameter bolt & nut to align them with the mag ball hole centerline, and pressed them into the effector with a small pair of channel locks on the ball mounting surface and the aligning bolt head. Don't overtighten the mag balls; tighten with a socket held in your hand will be plenty. I cleaned up the hole that the cooling tube goes through to a tight fit, and used a piece of silicone tubing with a small zip tie to secure the cooling tube. There's a small tower to secure the wiring to with zip ties to keep them from interfering with the rods.