1 (edited by 2n2r5 2013-08-07 01:25:33)

Topic: Layer Shifts not due to Motor Skips

I am currently working on fixing an issue that I have never seen before. While testing banding I came across some intermittent layer shits that shifted back. This reminds me a lot of the alignment print of ink jet cartridges.
This is the first time I have noticed this but I have been messing with so many things lately. The latest mods that I did include the Lawsy's replacement carriages and my version of the threadless ballscrew. If anyone has seen this before or has any ideas I am open to suggestions.

Note: This only seems to happen in the Y direction. The bands differ in height, severity and period although, they match on all cylinders.

http://2n2r5.com/pictures/printer/show-n-tell/results1.jpg

http://2n2r5.com/pictures/printer/show-n-tell/results3.jpg

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SD3 w/ mods:
Glass bed with QU-BD heat pad upgrade, threadless ballscrew w/ 8mm smooth rod, spectra line belt replacement, lawsy MK5 extruder, Lawsy replacement carriage, E3D hotend, Ramps 1.4 w/ reprap discount controller, DRV8825 drivers, 12v 30A PS, Acrylic case, Overkill Y-idlers, Filament alarm, Extruder fan + more.

2

Re: Layer Shifts not due to Motor Skips

Just out of curiosity is it shifted or indented all the way around?
If you can't figure it out where does that leave the rest of us?
unrelated to this issue I noticed on another post you have a spare chip you'd be willing to sell.
I'd be interested but I am unsure what that gains me? As I too am addicted to mods just not at your level yet.=D

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
SSR/500W AC Heated Glass Bed, Linear bearings on SS rods. Direct Drive Y-axis, BulldogXL
Thanks to all for your contributions

3

Re: Layer Shifts not due to Motor Skips

really weird its about the same level on all the cylinders. ill be interested in how you fix this, im sorry im not any help right now though sad

4

Re: Layer Shifts not due to Motor Skips

wardjr wrote:

Just out of curiosity is it shifted or indented all the way around?
If you can't figure it out where does that leave the rest of us?
unrelated to this issue I noticed on another post you have a spare chip you'd be willing to sell.
I'd be interested but I am unsure what that gains me? As I too am addicted to mods just not at your level yet.=D

It is shifted, where one side juts out the other side indents smile And there are plenty of smart people on here that can help out. I was hoping to find a resolution publicly so when this topic gets marked as solved, everyone profits smile


About the chip:

If you have a new board, the chip won't gain you anything because it is for the sanguinlolololululuo. If you do have the Sanguinololu then it will allow you to add the Panelolu LCD with SD card. The ATmega644P that comes with the old board has 64K memory limit. This isn't enough load the firmware that supports the LCD. In fact, the normal firmware is around 58K so you don't have a lot of room left in memory for many feature adds. The new boards have plenty of space so no worries there.

If you aren't looking to add a bunch of features to your stock motherboard then you don't need a new chip. If you buy a Panelolu, the additional upgrade chip is usually only $8-10 more. The only reason to buy the chip separately is if you need a new chip because the old one is blown or because you are looking to add a bunch of code.

SD3 w/ mods:
Glass bed with QU-BD heat pad upgrade, threadless ballscrew w/ 8mm smooth rod, spectra line belt replacement, lawsy MK5 extruder, Lawsy replacement carriage, E3D hotend, Ramps 1.4 w/ reprap discount controller, DRV8825 drivers, 12v 30A PS, Acrylic case, Overkill Y-idlers, Filament alarm, Extruder fan + more.

5

Re: Layer Shifts not due to Motor Skips

Did the bottom of those prints warp at all ?

6

Re: Layer Shifts not due to Motor Skips

Nope, dead flat and perfect adhesion.

SD3 w/ mods:
Glass bed with QU-BD heat pad upgrade, threadless ballscrew w/ 8mm smooth rod, spectra line belt replacement, lawsy MK5 extruder, Lawsy replacement carriage, E3D hotend, Ramps 1.4 w/ reprap discount controller, DRV8825 drivers, 12v 30A PS, Acrylic case, Overkill Y-idlers, Filament alarm, Extruder fan + more.

7

Re: Layer Shifts not due to Motor Skips

just to be thorough, did you check the GCode to see if the shift was there? 

If you were to print this code again, would it repeat the shift in the same spot (same layers)?

To print or, 3D print, that is the question...
SD3 printer w/too many mods,  Printrbot Simple Maker Ed.,  FormLabs Form 1+
AnyCubic Photon, Shining 3D EinScan-S & Atlas 3D scanners...
...and too much time on my hands.

8

Re: Layer Shifts not due to Motor Skips

pirvan wrote:

just to be thorough, did you check the GCode to see if the shift was there? 

If you were to print this code again, would it repeat the shift in the same spot (same layers)?

Good question! I was actually planning on running through the g-code and doing min and max y value search and seeing how many times each shows up. It it doesn't equal my layer count -1 then that could be my problem.

I an running the print again but I won't be back until later tonight to see the results.

SD3 w/ mods:
Glass bed with QU-BD heat pad upgrade, threadless ballscrew w/ 8mm smooth rod, spectra line belt replacement, lawsy MK5 extruder, Lawsy replacement carriage, E3D hotend, Ramps 1.4 w/ reprap discount controller, DRV8825 drivers, 12v 30A PS, Acrylic case, Overkill Y-idlers, Filament alarm, Extruder fan + more.

9

Re: Layer Shifts not due to Motor Skips

lol if you can look at the GCODE  and see the print thats like Neo seeing the Matrix  lol to me anyway ...

10 (edited by 2n2r5 2013-08-07 00:04:04)

Re: Layer Shifts not due to Motor Skips

Via IRC

adrian wrote:

MD_2n2r5 - lower your bed adjustment all the way down... it might be that you have got it adjusted high, and on the alu beds, that will allow it to actually rock a fair bit... Lower the bed against the alu bed, and the obviously readjust your z-tab

I figured I will post this here just in case this is the fix. Yes, I know this was an easy one. The simplest fixes are always the hardest. tongue

SD3 w/ mods:
Glass bed with QU-BD heat pad upgrade, threadless ballscrew w/ 8mm smooth rod, spectra line belt replacement, lawsy MK5 extruder, Lawsy replacement carriage, E3D hotend, Ramps 1.4 w/ reprap discount controller, DRV8825 drivers, 12v 30A PS, Acrylic case, Overkill Y-idlers, Filament alarm, Extruder fan + more.

11

Re: Layer Shifts not due to Motor Skips

Fixed, see above ^

http://2n2r5.com/pictures/printer/show-n-tell/happy_now.jpg

SD3 w/ mods:
Glass bed with QU-BD heat pad upgrade, threadless ballscrew w/ 8mm smooth rod, spectra line belt replacement, lawsy MK5 extruder, Lawsy replacement carriage, E3D hotend, Ramps 1.4 w/ reprap discount controller, DRV8825 drivers, 12v 30A PS, Acrylic case, Overkill Y-idlers, Filament alarm, Extruder fan + more.

12

Re: Layer Shifts not due to Motor Skips

Okay... Here is the full list of factors that were contributing to the layer offsets that would fix themselves.

1. Bed set too high and would shift as a result
2. The carriage upgrade had bit of slack around the bearings and it could shift in the Y direction
3. My extruder has ~1mm of wobble where it will shift and stay. If it catches an edge of an internal wall it will show on that layer.

Fixes:
1. Lowered bed to rest at lowest point. Upgraded springs to apply more pressure to bed.
2. Used U-mold plastic to hold edges of bearings and take up any slack.
3. Printed a new base for the MK5 that has less wobble when using the E3D.

SD3 w/ mods:
Glass bed with QU-BD heat pad upgrade, threadless ballscrew w/ 8mm smooth rod, spectra line belt replacement, lawsy MK5 extruder, Lawsy replacement carriage, E3D hotend, Ramps 1.4 w/ reprap discount controller, DRV8825 drivers, 12v 30A PS, Acrylic case, Overkill Y-idlers, Filament alarm, Extruder fan + more.

13

Re: Layer Shifts not due to Motor Skips

what did you use to slice that part for your test?

SD2 with E3D, SD Press, Form 1+
Filastruder
NYLON (taulman): http://www.soliforum.com/topic/466/nylon/

14

Re: Layer Shifts not due to Motor Skips

Slicer. I have since reprinted with success.

SD3 w/ mods:
Glass bed with QU-BD heat pad upgrade, threadless ballscrew w/ 8mm smooth rod, spectra line belt replacement, lawsy MK5 extruder, Lawsy replacement carriage, E3D hotend, Ramps 1.4 w/ reprap discount controller, DRV8825 drivers, 12v 30A PS, Acrylic case, Overkill Y-idlers, Filament alarm, Extruder fan + more.