Dc42IR Calibration Problems on Rostock Max V2



  • Did you save the results before printing?

    After running auto calibration and before doing anything else, run the bed mesh compensation and see what your bed map looks like.

    Don't forget that you can calibrate the steps of each motor too. Find an accurate way to measure the movement of the X, Y and Z carriages. Command 100mm movement and measure actual movement.



  • Any progress today?



  • @number40fan:

    Did you save the results before printing?

    After running auto calibration and before doing anything else, run the bed mesh compensation and see what your bed map looks like.

    Don't forget that you can calibrate the steps of each motor too. Find an accurate way to measure the movement of the X, Y and Z carriages. Command 100mm movement and measure actual movement.

    I'm going to post pictures in a bit if I can get a chance. I haven't done any mesh compensation yet, I'll look at that tomorrow I guess.

    I'm not horribly concerned about the steps/mm thing. Those measurements are pretty darn close and could just be shrinkage of materials. I won't worry about perfect dimensions until I get the rest sorted out. Simply being able to print a good looking object is the primary concern right now. So far everything I've printed looks horrid with wavy walls and banding.

    @number40fan:

    Any progress today?

    Sort of …it's printing. Which is better than it was before. Sadly I've now also experienced some interesting heat creep type problems which I never had before...so I'm trying to understand what changed that as the only hot end related changes were to a PT100 and the all brass heat block, which I'd have thought would reduce such type of problems.



  • Here's images of the 40x40x2 block. And a 75mm diameter 0.2mm high calibration disk.
    http://imgur.com/a/1iV34



  • There you are….took me a bit to find this thread again. Do you have a way to measure the width of the diagonal arms near the carriages and at the effector? Reading above, someone in the "shop" has a large caliper. Might have them check the uprights/tower spacing, if you could. Place a flat bar on the inside from tower X to Z and measure how far away Y is. Do this for all three towers at the bottom, middle and top. There has to be something seriously wrong to have your calibration disk to come out like that.

    One last thing, can you post a picture of how you have your Z-probe mounted?



  • @number40fan:

    There you are….took me a bit to find this thread again. Do you have a way to measure the width of the diagonal arms near the carriages and at the effector? Reading above, someone in the "shop" has a large caliper. Might have them check the uprights/tower spacing, if you could. Place a flat bar on the inside from tower X to Z and measure how far away Y is. Do this for all three towers at the bottom, middle and top. There has to be something seriously wrong to have your calibration disk to come out like that.

    One last thing, can you post a picture of how you have your Z-probe mounted?

    Another fun print has been added that clearly failed horribly! No clue what happened there with the massive shifting.

    I can measure diagonal arm width, I have standard 6" calipers. However, that almost seems moot since the width likely changes a bit since the SeeMeCNC ball ends aren't exactly round and looks to me like the arms would shift a bit during operation.

    And yup I asked them to check that tower distance also, so they SHOULD have. However I can check that again.

    I also posted a few more pics to that same imgur link. The terrible print and the mount for the IR sensor.



  • Not sure if you have noticed, but there are now three of you with Trick laser components having very similar issues and at least one other with a Rostock. I hope that all of you aren't fighting a loosing battle. The rods need to stay the same width, probably why they come with tight springs to keep them there. It is hard to tell from the pictures, but are the balls that attach to the effector printed or molded plastic? Is there any slop available for them to move around on the effector when tightening them down that might pull one end away from the tower compared to the other?

    The picture of the shift in the print look like the bed might have moved. Is that possible?



  • Great….

    Yup the older style CF rods used Traxxas ball ends and used rubber tubing bands to keep tension for that reason..I have that setup on my machine at home that I can't get right either and I've given up on basically. So either both ball end styles are amiss or... idk?

    The ball ends are the now standard SeeMeCNC injection molded type. They don't have much play, I have to put some decent effort into poking at the effector to get movement.
    https://www.seemecnc.com/collections/parts-accessories/products/replacement-ball-joints

    And they came with the Trick Laser effector and mount
    http://tricklaser.com/Aluminum-ball-joint-platform-with-Groove-Mount-PLAT-ALU-BJ-32GM.htm

    I didn't know they had an odd flatted part on them from the pictures or I would have been suspect of their ability from the get go. However, I cannot believe that SeeMeCNC sells SO many printers with this setup and so many people having more than decent success with them if these balls are the problem.

    Bed shift?? I really doubt it. NOBODY was around the machine and it's held in place…it could only possibly rotate around center if it moved at all due to the bed fasteners being at each of the towers. These are the holders I am using for the bed. I couldn't stand the clips because they force the bed to curve to fit the bow in the PCB heater. Which ALWAYS humps in the middle and causes problems. I've tried everything I can find to flatten said heater to no avail. These clips with the TR aluminum heat spreader plate on the PCB allow the glass to sort of float at the edges and reduce the overall affect of that curve.
    https://www.thingiverse.com/thing:974489



  • If you live in the states, I'll pay shipping to take the one you have at home off of your hands to give a go at it. If I can get it to work, you can have it back for the price of my shipping cost plus whatever to get it back to you.



  • @number40fan:

    If you live in the states, I'll pay shipping to take the one you have at home off of your hands to give a go at it. If I can get it to work, you can have it back for the price of my shipping cost plus whatever to get it back to you.

    Heh, yep I do and that's mighty tempting! The more I read about Rostocks and their seeming random issues the less I have motivation to tackle it. I've been out of work the last few days sick so I haven't been able to get any more measuring done on the one at work unfortunately.

    I just read another thread about calibration and I'm getting the feeling that much longer arms are needed to make anything work right. And the spring tension between arms also being an issue up for debate as to whether it works better or worse. It just seems like there isn't any clear answers when dealing with Rostocks. Yet I see quite a few people getting absolutely fantastic prints out of them…makes me confused.



  • I'll even add, if I can't get it to work, I'll pay to ship it back to you. Or I could load it up with a couple pounds of tannerite and dispose of it properly. 😄



  • @number40fan:

    I'll even add, if I can't get it to work, I'll pay to ship it back to you. Or I could load it up with a couple pounds of tannerite and dispose of it properly. 😄

    ROFL the tannerite idea has occurred to me SEVERAL times over the last two years!!



  • So I've had other work related things keeping from the ability to work on this problem much for a while. I did however during that time manage to print some new belt tensioner options that work very well. I now have consistent belt tension on all three belts and it is easily adjustable. Right now each is set to ~1lbs 3oz measured at 1" deflection from the tower at the halfway point from top to bottom of the tower.

    I've checked the alignment of the towers once again and somehow they're farther off now than they were before. At this point I'm guessing attributed to environmental changes. It goes down to 18C in that room overnight, but during the day with people it runs around 22-24C. Also moisture has gone from 70%RH to 47%RH in the last month. So as of now the towers are very close to 90degrees to the bed. As in I can't slip a sheet of paper in between the square and the tower, but I can see a bit of a gap.

    Measurements between the towers at the top and bottom were taken with a 6" caliper using the head to tail methods so they are not absolute measure, but simply relative between each tower. The X-Y bottom: 80.97, top 81.04. Y-Z bottom: 80.13, top: 80.93. Y-Z bottom: 80.24, top: 81.11.

    (all measuring etc done with bed@60C)
    This is this morning G32 with S-1 before adjustments with 0 offset in the bed.g
    Bed probe heights: 0.103 -0.007 0.162 -0.007 -0.057 0.151 0.015 -0.022 0.115 0.020 0.010 0.039 0.011 0.117 0.062 -0.020, mean 0.043, deviation from mean 0.065

    I just reran through the "Adding trigger height to bed.g" steps and calculated all the offsets and placed them in my bed.g.
    Bed probe heights: -0.017 0.161 0.475 0.368 0.028 0.006 -0.258 -0.232 -0.142 -0.032 0.165 0.191 -0.004 -0.035 -0.136 -0.008, mean 0.033, deviation from mean 0.193

    Then G32 with S6 x3
    Calibrated 6 factors using 16 points, deviation before 0.197 after 0.052
    Calibrated 6 factors using 16 points, deviation before 0.055 after 0.055
    Calibrated 6 factors using 16 points, deviation before 0.051 after 0.051

    Then I switch back to no offsets (because it was better before) and I get worse results for S-1
    Bed probe heights: 0.174 0.022 0.355 0.301 0.210 -0.024 -0.090 0.017 0.015 0.004 0.263 0.186 0.048 0.001 -0.097 -0.128, mean 0.079, deviation from mean 0.144
    S6
    Calibrated 6 factors using 16 points, deviation before 0.168 after 0.072

    Cycled power, now no offsets S-1
    Bed probe heights: 0.099 -0.003 0.342 0.339 0.235 0.176 -0.002 -0.070 0.040 0.004 0.126 0.211 0.123 0.101 -0.010 0.009, mean 0.107, deviation from mean 0.121

    S6 x2
    Calibrated 6 factors using 16 points, deviation before 0.160 after 0.054
    Calibrated 6 factors using 16 points, deviation before 0.055 after 0.055

    M665
    Diagonal 311.755, delta radius 146.204, homed height 360.718, bed radius 140.0, X 0.102°, Y -0.139°, Z 0.000°

    M666
    Endstop adjustments X-0.18 Y-0.20 Z0.38, tilt X0.27% Y0.19%

    And printing a 75mm diameter single layer test disk comes out pretty bad looking still.

    I have no clue what else to adjust, what else to modify etc. I've locked everything down mechanically that I can possibly think of and is possible with the melamine frame.


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