Dimensional accuracy

Zortrax M200 General Discussion
1

Hi!

I just printed a test block which was designed with the following dimensions:

55mm wide, 55mm deep, and 28mm tall.

I printed the part with 0.14 resolution and light fill…

here are the caliper results: 54.55 wide, 54.85 deep, and 28.03 tall

I’m a bit surprised about the 54.55…that’s quite a bit off. Obviously that wouldn’t matter for a figurine but for engineering stuff half a mm can be an issue (when two parts have to fit together).

What do you think?

2

[quote name=Andre]Hi!

I just printed a test block which was designed with the following dimensions:

55mm wide, 55mm deep, and 28mm tall.

I printed the part with 0.14 resolution and light fill…

here are the caliper results: 54.55 wide, 54.85 deep, and 28.03 tall

I’m a bit surprised about the 54.55…that’s quite a bit off. Obviously that wouldn’t matter for a figurine but for engineering stuff half a mm can be an issue (when two parts have to fit together).

What do you think?
[/quote]

You printed this part with unofficial 0.0.4 version there .14 is set up just for first tests and still not for dimensional accuracy.

Use .19 with full infill and everything should be ok.

Problems with 0.0.4 version please post always here: http://zortrax.com/forum/viewtopic.php?id=185

Light infill is just for fast check of print and due of empty space inside of model it sometimes result with higher shrinkage, for dimensional stable parts always use full infill.

Best Regards

3

Thanks for the explanation, Martin! Makes sense. :slight_smile:

4

Also what I remember is that you should let for part to cooling, before you try to remove it from the platform, hot part is near to glass transition temperature and by removing it without cooling you can change geometry of it (U shape).

Best Regards

5

Ok, thanks for the information!!! I think I should wait a bit longer then… It’s usually still a little warm.

6

Hi,

is there any reason or already known problems, that the accuracy of the printer becomes worse? When I got this printer it worked with an accuracy of 0.1 on outer contours and 0.3 on inner contours. Was no problem, because I knew I had to offset the inner contours by 0.15 and it worked perfect. But now the accuracy becomes worse. I set the offset as every time and it is still 0.5mm off. I also struggle with the different tolerances of x-axis and y-axis. All round contours become oval.

If the surface would look not as usual I would suggest I have loose screw, but I can´t see problems there.

Any suggestions?

Thank you in advance.

Best regards,

Olli

7

@Olivier

Please submit a request on the support according to this problem, they will provide for you instruction how to solve this quickly.

http://support.zortrax.com/hc/en-us

Best Regards

8

Oliver, please share the solution afterwards! Thanks!

9

Ok, I submitted a request now and will update you with the solution as soon as possible.

Oliver

10

Little update to my issue. The Zortrax support contacted me almost immediately and advised me to clean and grease all rails and check the belt tension especially of the short belts. I did this and additionally I cleaned the nozzle and the hot end in acetone. I printed some kind of calibration part and the accuracy was as good as at the beginning. But at this test print I figured out that these double rails were not perpendicular. The cube was more like a rhomboid. So I printed an adjustment part to make the double rails parallel to the rotating shafts. I adjusted all rails and now erverything is working good. Even the round contours are really round now. Additionally to that a rattling sound on fast movements is gone and the problem that the nozzle does not reach the front left corner while doing auto calibration is also solved.

Now the machine works better than ever before and I’m happy.

I’m also really satisfied with the fast response of Zortrax support.

Oliver

11

Maybe your solution applies to all the ones that have ratling sounds and it's a factory issue. Can you post procedure and part used to adjust the rails?

12

As I talked to Zortrax about this issue with the rails, they told me that they will prepare a manual for fixing this. But of course I can and will post the part as well as a description of the procedure like I did this.

I’m not sure at all, but I guess the sound came from one of the fixing blocks of the double rails. There you have the opinion to slightly tighten them. You can see this also in this manual from Zortrax from minute 2:52.

http://support.zortrax.com/hc/en-us/articles/201002262-XYZ-Axis-Maintenance

I’m going to prepare a little guide for checking if the rails are perpendicular.

Regards,

Olli