left side shadow / improving sharp edges

Zortrax M200 General Discussion
#1

Hallo,

I noticed most of my prints have small "left side shadows" of the printed contour.

It´s not a big thing at all, but maybe this can be improved.

I also noticed that often edges of symetric parts defere a bit.

One side is clean, and the other side is more round or has al little bump.

Is there anything I can do, to optimize these peculiarities?

1) Prevent Shadows

2) Sharp edges all around without little bumps.

#2

The "shadows" are "ghosting" or ringing from mechanical resonances. Could probably be improved by reducing print speed, but not many people want to print more slowly I think. It was improved considerably a while ago by one of the firmware updates, are you using recent firmware?

#3

Hi Polinizei,

Timing belt tension is also known to affect mechanical resonances, that is causing your shadows.

Most likely the tension has been lowered for some reason.

Once I designed a 10 m gantry robot using timing belts and got resonance issues.

The timing belt supplier came and used a tuning fork when adjusting the tension. The tension was supposed to be much higher than I had anticipated.

But often, using your finger on the belt is sufficient.

Best regards

Hans Lagerström

#4

Julia, Hans,

thanks for your feedback.

For that I installed the android Tune-Pitched App on my Galaxy und retuned all belts in specific Positions @144Hz +/- 30.

Not shure that my tuning was succesfull...

My test part contains all critical details. At least all the issues are reproducible.

#5

The "shadows" are "ghosting" or ringing from mechanical resonances. Could probably be improved by reducing print speed, but not many people want to print more slowly I think. It was improved considerably a while ago by one of the firmware updates, are you using recent firmware?

By the way, is it possible to have a mode slower than normal, in à future version of Z-suite ?

#6

Julia, Hans,

thanks for your feedback.

For that I installed the android Tune-Pitched App on my Galaxy und retuned all belts in specific Positions @144Hz +/- 30.

Not shure that my tuning was succesfull…

My test part contains all critical details. At least all the issues are reproducible.

Very interesting !

You’re Right, à belt has à specific frequency

http://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/software/downloads_21/belt_tension_calculator.xls

#7

Polinizei,

The timing belt GT2 6 mm should have a working tension of 27,5 N (they say 2,8 kg) according to some suppliers on internet.

So, I arranged a belt, 283 mm, with 27,5 N tension and listened to the pitch with my Iphone frequency meter and got 136 Hz, give or take.

My M200 four long belts are 84-96 Hz.

Your belts seem to be on the spot.

Regards

Hans