Topics created by jnofsinger

@dc42

I have a very sturdy ender3 frame with corner blocks and all wheels removed for rails. I also have removed the glass bed to reduce weight. Tests run with

M203 X12000 Y12000 Z500 E1200 ; Set maximum speeds (mm/min)
M201 X3000 Y3000 Z250 E250 ; Set accelerations (mm/s^2)
M566 X300 Y300 Z20 E600 ;jerk

After running multiple tests with ei3 and zvddd is that canceling the high frequency in the graph produces the best overall result. ( I have not done Y yet only X)

Here is no shaping and speeds from 30, 45, 60, 75, 90, 105, 120, 135, and 150mms for both X and Y

x-orig.jpg y-orig.jpg

here is the best I can get so far using ZVDDD 78.9

x-zvddd.jpg y-zvddd.jpg

here is the backside view of ZVDDD 78.9

IMG_3662.jpg IMG_3663.jpg

very impressive overall happy with ZVDDD and the higher frequency cancel. I will try again with the mount on Y to see if I can tune Y itself. Although not part of the latest beta firmware in my case I could use a separate Y frequency cancel.

I might try to play around with sampling as you suggested in the other thread to smooth at lower speeds. I normally print around 75/90mms but many smaller prints can't get up to speed so I do need a better cancel at lower also.

Jim

@jnofsinger there is a "minimum acceleration" parameter in the M593 command. Lower values will cause input shaping to be used in more situations, at the expense of increased print time.

The default damping factor is 0.1, however on one of my machines I observed that setting the damping factor to 0.05 or 0 gave better results. In particular, EI shapers may work better with damping factor 0.

Pressure advance works separately from input shaping, although input shaping affects PA somewhat. So you may want to tune PA again when you have established what input shaper you want to use.

@jnofsinger if you go for using the second z port or a splitter cable, both of those options are not prevented from going out of sync.
The best option is using E1 and then a z probe to level the bed/gantry pre print

So this is now fixed! The mosfets were damaged. The ones I had are black so they are very difficult to see the damage till I took the board out of the printer.

I ordered the newer ones from Digikey before the storm, so they Monday.

I can say this is the first time I replaced such a small part on the board, but with enough patience and practice on a scrap board it is completely do-able without expensive gear. I just have a regular $50.00 iron and a very small tip.. I then just dragged it over the ends and the solder stuck!

it was just pretty strange the under-voltage issue with the broken mosfets... not sure how long they were blown as the heater fan I have is 5v and it was pulling 4.4v for awhile.

Thanks again for your help!

Jim

@jnofsinger No problem!

Please post your config.g and the results of M122 after it has stopped. Do you see any errors in the gcode console?

isn't the pictures on the wiki page clear enough, or did you mean pictures of where to put a blade fuse?

are you using all your thermistor inputs?

@bearer Yes when in the web control