KEEVO Printer (corexy)



  • Hello again,

    I just wanted to share with you the last build I made, which of course uses Duet 🙂

    (KEEVO = Cube in Greek)

    PhotoIsoFront.JPG
    PhotoIsoBack.JPG
    (yeah the cables need some management)

    It is also posted on Thingiverse -> https://www.thingiverse.com/thing:4129443

    Any feedback is welcome of course!

    Also, regarding the 3 leadscrews (which are only really mounted on the bottom), do you think that the forces from the Z belt will bend the leadscrews in the long run. I don't really see any bending though. It can be seen more clearly in this video which was the previous version (an hbot without duet and other stuff, but z axis is the same) -> https://www.youtube.com/watch?v=K0pcGKAQ4eA

    Cheers 🙂


  • Moderator

    @nuverian said in KEEVO Printer (corexy):

    do you think that the forces from the Z belt will bend the leadscrews in the long run

    Unlikely.

    Nice looking printer.



  • @Phaedrux Hey thanks!

    Great printer you have as well 🙂 Similar Z concepts. I see you use two bearings (as far as I understood). Was that for the same reason and for peace of mind?

    I also don't think it will be a problem, but what I was thinking is adding a counter bearing on the bottom so that when the belt pulls, the leadscrew won't budge. Something like this mockup:
    CounterBearing.png

    Maybe an overkill, maybe not 🙂


  • Moderator

    Yes, the double bearing block was mostly to help keep the lead screw stable vertically, but also would help counter and pulling forces from the belt tensioner.

    https://www.thingiverse.com/thing:2401504



  • @nuverian said in KEEVO Printer (corexy):

    @Phaedrux Hey thanks!

    Great printer you have as well 🙂 Similar Z concepts. I see you use two bearings (as far as I understood). Was that for the same reason and for peace of mind?

    I also don't think it will be a problem, but what I was thinking is adding a counter bearing on the bottom so that when the belt pulls, the leadscrew won't budge. Something like this mockup:
    CounterBearing.png

    Maybe an overkill, maybe not 🙂

    Double shear is nearly always better than single shear.



  • The screw is 8mm diameter and you're pulling on it with the same belt that's pulling on the 5 mm motor shaft. If it's OK to do that at the motor shaft, it's probably OK at the larger diameter lead screw.

    You could easily fabricate a two-bearing mount for the lead screw as a single piece either from rectangular aluminum tubing or by printing a part with a tang that fits in the t-slot. I did this in my sand table (the brown part):

    alt text

    The two pieces that make up the pulley mount are aligned by bosses. The bearings press-fit tightly into the top and bottom pieces.



  • Thanks for your comments.
    I ended up adding a counter bearing on the bottom to help with the belt forces, as well as a collar on the leadscrew above the pillow bearing to help with vertical/gravity forces.


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