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Genesis XZ

Discussion in '3D printers' started by Andrew Long, Apr 24, 2015.

Genesis XZ

Genesis XZ

Discussion in '3D printers' started by Andrew Long, Apr 24, 2015.

CoreXZ implementation on 3d printer using Openbuild and RobotDigg parts.

CoreXZ 3d printer
  1. Andrew Long

    Andrew Long New
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    Andrew Long published a new build:

    Read more about this build...
     
    #1 Andrew Long, Apr 24, 2015
    VooDoo likes this.
  2. Keith Davis

    Keith Davis Veteran
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    VERY interesting Andrew!

    I think we'll all be curious to see the edits in Marlin. :) Very innovative use of the Core concept. You not only thought outside the box, you got Core outside of a box too! ;) Good use the new C-Beam too.

    What plate are you using for the z axis wheels? It doesn't seem to be an Open Builds plate. What advantage does it have over the standard OB Mini V Wheel Plate?

    When designing belt driven z axis I've had to set Marlin to keep the z motor(s) powered when not in use to keep the x axis from falling until power is turned off. Maybe in this core design that wont be a problem.
     
    #2 Keith Davis, Apr 24, 2015
  3. Andrew Long

    Andrew Long New
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    Well I gave up on Marlin after getting it somewhat working (with some help from @bearwood), the stepper.cpp file needs some re-work to get limit switches working with on a CoreXZ setup. The motion works fine though. Good new is that the Repetier firmware has support for CoreXZ and works great.

    The plate for the z-axiz is the OpenBuilds 20mm gantry plate. Haven't seen it used in many builds but it is half the cost of the full size gantry plate. Its a little cheaper than the mini-v plate and I can use the same wheels throughout the build. I reduced the cost of the wheels by using 625zz bearing for a lower cost over the 625-2RS that come with the wheel kits (not worried about a high dust environment). On ebay you can get 50 bearings for about $18, which puts it at about 1/3 of the cost per bearing.

    With the CoreXZ design I have no problem with the gantry moving without power, must have to with the two belts working opposite of each other. I was worried about it a bit but after getting the guts together tonight I can say with certainty that it is not a problem as long as you don't have too much weight on the gantry. I placed a Wade's reload extruder with a nema 17 on the gantry and it didn't move until I placed a small piece of extrusion on it. I was going to use the Wade's direct to hotend but rethought that about a week ago due to concerns on gantry weight and am going with a Bowden setup, so I should be fine.

    Here's my progress so far, decided I couldn't wait for my missing F625ZZ to use as pulleys and ended up getting some fender washers (3/16 x 7/8") for $0.17/each that fit perfectly on M5s and used some regular 625zz ball bearings I had let over from making the wheels sandwiching 25mm m5 screw, fender washer, m5 washer, 2 bearings, m5 washer, fender washer, 6mm spacer then drop in tee nut. Works great, but I will probably switch to the F625ZZ once I get them since I'll have them.

    Anyways here is some pictures of my progress. Also you'll notice in the pictures I used 20X60 vrail on the uprights, but I think 20X40 would work fine, thats whats in the sketchup file.
     

    Attached Files:

    #3 Andrew Long, Apr 25, 2015
    Last edited: Apr 25, 2015
    bearwood likes this.
  4. Keith Davis

    Keith Davis Veteran
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    Huh, somehow I missed that there is a 20mm Gantry Plate. Cool!

    F625ZZs from Robotdigg take forever (the proverbial "slow boat from China"). I got some F695ZZs for about the same price out of California in 5 days. Two F695ZZs have only 6mm between flanges so things really need to line up, but they are only 13mm flange dia instead of 16mm and also have 5mm holes.

    I hadn't even thought about endstops being a problem, but - YEAH! Good to know Repetier supports CoreXZ. I wonder if that's one of those things where the programmer just went, "Well why wouldn't I add it?" or if they actually had a Core XZ design needing it.

    A good test for this would be to take a skp of the full size gantry plate, raise it to 100mm high, set the slicer to Z lift .5 on non-print moves, and run the print with no filament. At 100mm/20% infill it takes about 24 hrs to run. With that plate's 71 holes to work around it will give your z axis the same workout as hundreds of hours of normal printing. Be curious to see how level the extruder is with the 4 corners of the bed afterwards. In fact, leaving the extruder off but hooked up so it runs, and running the print with a dial indicator mounted on the x axis plate is how I do that test (I have a totally different view of so-called "auto-bed-leveling" after doing that test).

    Keep us up to date Andrew. This is a pretty radical concept (radically cheap too). Hope it all works out!
     
    #4 Keith Davis, Apr 25, 2015
  5. jaimito

    jaimito New
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    Can you show a few more pics from the other side?

    It looks like each motor is only pulling in one direction, lol.
     
    #5 jaimito, Sep 11, 2017

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