Swaying prints.

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SIMONZ
Posts: 9
Joined: Wed May 09, 2018 9:11 pm

Swaying prints.

Post by SIMONZ » Wed May 09, 2018 9:28 pm

I have a Geeetech M201 printer. First one I have owned so be kind!

After various issues with the kit I finally got it up and running with a lot of help from a friend who has a couple of printers. The problem I have is that when printing anything over a few millimetres high the prints start to move. The best way to describe it is like a beach, ripples front to rear, very slight side to side but worst front to back. Hopefully if I've got it right there should be a picture of a small block. Dimension wise it's spot on.

What's been done so far, removed the metal plate and fitted glass print bed (weight reduction/reduced inertia), changed the Y axis (front to back) motor for a bigger one, replaced all the 8mm rods (some arrived as much as 0.8mm bent!), adjusted the stepper drivers to 1.2 volts.

Help?
Attachments
20180421_223445.jpg
Wavey lines visible.
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Stefan
Posts: 223
Joined: Thu Jun 15, 2017 12:46 am

Re: Swaying prints.

Post by Stefan » Thu May 10, 2018 5:44 am

Check your belts. They may be loose.

SIMONZ
Posts: 9
Joined: Wed May 09, 2018 9:11 pm

Re: Swaying prints.

Post by SIMONZ » Thu May 10, 2018 8:49 am

They seem tight to me but what tension? Played around a bit with the tension whilst running, blackened it until you could see and feel slight play then kept tightening until there was no free play in the tensioner then added a bit more. From a very slight bit of give to what I would class as a bit too tight it didn't seem to affect it.

This is why I'm at a loss!

Next is swapping the motor drivers for TMC 2100, these are what geeetech have suggested?

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Moorviper
Posts: 232
Joined: Wed May 24, 2017 1:19 pm
Location: Hessen/Rhön - Germany
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Re: Swaying prints.

Post by Moorviper » Thu May 10, 2018 12:38 pm

check if the layer heights are evenly.
maybe a Z axsis problem

SIMONZ
Posts: 9
Joined: Wed May 09, 2018 9:11 pm

Re: Swaying prints.

Post by SIMONZ » Thu May 10, 2018 3:31 pm

The guy that helped set it up initially drilled it hard home that the first layer is very important so spent ages making sure the bed is level even to the extent of bolting the printer to a perfectly flat surface so no movement of the printer and the first layer looks even colour no thick areas. Presume that's what you mean?

Using Cura as slicer through Repetier.

Stefan
Posts: 223
Joined: Thu Jun 15, 2017 12:46 am

Re: Swaying prints.

Post by Stefan » Thu May 10, 2018 7:35 pm

Let's see if we can take some variables out of the equation. Try printing at a lower speed (30 or less). Hopefully this would exclude inertia issues with the hotend carriage. If it's mechanical, we will likely still see the waves

-S

SIMONZ
Posts: 9
Joined: Wed May 09, 2018 9:11 pm

Re: Swaying prints.

Post by SIMONZ » Fri May 11, 2018 11:34 pm

Right, if I got it right you should see a 15 x 15 x 20mm cube that's just come off the printer. Printed at 25mm/s print speed, 20mm/s outer perimeter speed and 15mm/s infil speed. Bed temp 65 and extruder 200 with PLA. X motor 32 deg C, Y motor 31 deg C.

Still showing ripples.
Attachments
20180511_223331.jpg
20180511_223331.jpg (2.37 MiB) Viewed 350 times

Stefan
Posts: 223
Joined: Thu Jun 15, 2017 12:46 am

Re: Swaying prints.

Post by Stefan » Sat May 12, 2018 2:23 am

Ok, let's go back to what Moorviper mentioned. Do your z-axis lead screws remain perfectly centered? ANY wobble? We are looking for a run-out of half the width of the ripple.

-Stefan

SIMONZ
Posts: 9
Joined: Wed May 09, 2018 9:11 pm

Re: Swaying prints.

Post by SIMONZ » Sat May 12, 2018 9:07 pm

Ok, on to the printer. The Z axis are looking like their going round an oval dog track! Probably a slight exaggeration but at least 1mm of run out in each side! Going to strip it and see what I can do or if not it's new screws!

Hopefully this might resolve the problem?...........

SIMONZ
Posts: 9
Joined: Wed May 09, 2018 9:11 pm

Re: Swaying prints.

Post by SIMONZ » Sun May 13, 2018 12:38 am

Been messin for a while now, it appears that the threaded rods are not that bad but the alloy joints between the rod and the motor seem to be sending the rods out of line? Is this a common problem, the connector blocks not in line? I've lined them up as well as I can and sure the test block is much straighter than before, but because of all the probls I've had it could be me wanting it to be sorted!

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