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schemer

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Posts posted by schemer

    Dimensions in Cura vs final printed part

    in UltiMaker Cura

    Posted

    1 hour ago, DivingDuck said:

    G0 F300 X150.07 Y116.084 Z6.2

    Correct. Z is the axis you need to look at. The value is in mm. Regarding the layer count calculated, the count starts with layer 0 not with 1.  🙂

     Well that is good. I should have known that as I used to program years ago and remember something about certain things starting from 0 vs 1.

    Dimensions in Cura vs final printed part

    in UltiMaker Cura

    Posted

    15 hours ago, Longtoke said:

     

    Heads up, the connectors for both of the z-axis steppers is perilously close to the movement of the print bed. If there is a bit of slack on the cable it can get caught by the print bed as it moves, and bingo, you're down the rabbit hole. Make  sure the plug is seated firmly into the stepper motor then make sure to push the excess cable into the adjacent hole cleanly, this takes it out of the path of the print bed permanently. 

     

    Another thing I'd recommend is linking the 2 z-axis steppers with a closed loop GT2 belt ( 748mm is perfect, 760mm will do but you will need to print a tensioner too ) and a couple of 20T 8mm bore GT2 gears. The right side Z-axis tends to sag a little when it's powered down, throwing the print head gantry off. While bed leveling will compensate for this to  a degree, you're better off linking the axis' and be down with it all. 

     

     

    Learn something new every day ! ( and cheers ;D )

     

    Props to you also schemer, most people wouldn't admit to it lol. 

     

    Thanks for your support Longtoke. I have a question on your linking of the twin z axis with a belt. Do you have any pics of that after it is complete? I can't picture it with the threaded rods in the mix. Maybe a project for later.

    Thanks

    Dimensions in Cura vs final printed part

    in UltiMaker Cura

    Posted

    On 10/10/2020 at 9:17 AM, DivingDuck said:

    What do the gcode say as last Z height?

    Exactly what line or what is the gcode for the last Z height?  I looked in Notepad++ . Is it the line with the largest number in the "Z" like the 6.2 in this line:

    G0 F300 X150.07 Y116.084 Z6.2

    The reason I think it may be that is when I did the preview it has 30 steps (if I remember correctly) and I was printing in 0.2 mm resolution. so 62./0.2 = 31

     

    11 hours ago, DivingDuck said:

    Errors happen and this gave a little lesson to learn. There a not a lot of people who speak about own mistakes.

    Glad you found and solve the problem. 👍

     Thanks for your support everyone.😇

    Dimensions in Cura vs final printed part

    in UltiMaker Cura

    Posted · Edited by schemer

    1 hour ago, gr5 said:

    You don't need to disconnect cables to rotate the steppers.  Worst case you can turn off the printer but usually that's not necessary.

     

    There is a selection to disable the steppers on the CR10S. I thought when the unit is powered on that the steppers are locked into their current step position so disabling them would allow for me to push the bed etc. But, on the older printers you could supposedly back feed voltage into the controller board by pushing the table or the hot end too fast and ruin the board. I guess it would be hard to turn the z axis too fast but I was just being careful. I didn't remove the cable(s) to rotate the stepper but when I was rotating it, I noticed the plug was unplugged causing my whole issue. Don't know when it happened, but it did. 🙂

    What is causing cura to print parts the wrong size?

    in UltiMaker Cura

    Posted

    20 hours ago, gr5 said:

    If it's off by exactly 2X - is it seeming to overextrude a lot?  It could be that your printer has a hardware problem where it is moving the Z axis half as much as it is supposed to.  There is a jumper on many 3d printers to set the Z axis steps/mm.  I think it's in the wrong position or maybe missing.  This is one possibility.

     I fixed it. The connector for the right z axis was unplugged. Don't know how or why. All good now. Thanks.

    • Like 1

    Dimensions in Cura vs final printed part

    in UltiMaker Cura

    Posted

    I fixed it. 😁 When I was checking the steppers and couplings for tightness and free turning, I chose disconnect steppers from the control panel so I could turn them. That is when I realized the right z axis stepper was not connected. Funny thing is I had noticed the cable with the connector for that stepper hanging off of the table but thought it was the unused connector for the filament sensor. It's printing fine now after re-leveling etc.

    startrek-picard-facepalm-s.jpg

    Dimensions in Cura vs final printed part

    in UltiMaker Cura

    Posted

    1 hour ago, GregValiant said:

    Z steps/mm

    Z Axis binding

    The screws holding the Z axis rod into the coupler and onto the stepper motor shaft are loose (popular problem).

    I was hoping you were right but I got the allen wrench and checked and the couplers are both tight. I can run the z axis up and down without any binding. And the print looks fine other than being thinner than it should be. What do you mean ny "Z steps/mm"?

    Dimensions in Cura vs final printed part

    in UltiMaker Cura

    Posted

    I have used Cura in the past and never noticed any issues with dimensions but now I have printed a few small parts with the latest version and have noticed some issues. I am not an expert but it seems strange when I open an stl file that is 2mm thick and slice it and print it, it measures 0.045 inch instead of 0.0787 and if scale it in Cura, it still comes out incorrect. I tried another part at 5mm thick and it too is way undersize in the thickness. Any ideas? Using a CR10S with a 0.4mm nozzle and PLA.

    Thanks,

    schemer

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