Other Projects => 3D Printing => 3D Printers => Topic started by: Deity on October 24, 2017, 09:49:14 AM

Title: Anycubic Kossel (pulley)
Post by: Deity on October 24, 2017, 09:49:14 AM
So, independently of knowledge that Yahmez had one himself I decided to get a Anycubic Kossel delta 3D printer.
The decision process is chronicled on another post here [add link to it later]

After over a month (yay for the CN slow boat) since I originally ordered it, I finally got my kit!
Furthermore it arrived on a Friday, so that means I had a lovely tinkering weekend!

I spent most of Saturday assembling it, it was not difficult, the instructions that come with it are clear and illustrated
with pictures. I was probably too overzealous making sure I had everything assembled just right, that's why it took me
all that time.

I had previously decided to add auto-leveling to it, and for that effect I had already an inductive probe ready
to add to my kit, also that's why I coated the glass bed with foil tape (see attached picture).

However, I have been struggling with the firmware... to get auto-levelling working properly (it insists in trying to probe
out of the bed area) but it might be some stupid and simple error. More on that tonight!


Ok it's confirmed, my issues with the auto-leveling were arising from the lack of M502 and M500 following the
firmware update! Also I had my towers switched around which means that I was reporting the position of my
probe wrongly!

Just printed a test cube and from here I can start fine tuning until I get nice prints!

(http://[attachment id=1 msg=3786][/attachment])
(http://[attachment id=2 msg=3786][/attachment])
(http://[attachment id=3 msg=3786][/attachment])

Title: Re: Anycubic Kossel (pulley)
Post by: Bajdi on October 24, 2017, 03:52:24 PM
Looks like a good machine, it doesn't use noisy LM8UU bearings  >:D
Not a fan of those little extruders though, but it's probably good enough for moderate printing speeds (0.2mm layers @ +-60mm/s)
Title: Re: Anycubic Kossel (pulley)
Post by: Deity on October 30, 2017, 01:52:43 PM
Well yes, that speed and layer height has been my default as I debug/tweak been debugging my printer.

As you can see in the attachment, between each print I would find some screws I had not tighten up properly,
so I would tighten then and do the next print. The increase in print quality is quite noticeable from one to the next.
Although the vertical wavy lines is still noticeable on the newest (first in line) print.

*balls2.jpg (88.94 kB . 1024x765 - viewed 1080 times)

P.S. - These feet are really amazing, printer is super silent now! Kudos to Yahmez for designing and sharing them with the world!
Title: Re: Anycubic Kossel (pulley)
Post by: Deity on October 30, 2017, 01:58:24 PM
To get rid of most of the remaining gooey spots I reduced acceleration and jerk (to the actual Anycubic suggested defaults) and managed to get a noticeable improvement, as can be seen by the couple of tree frogs below (before, after)

*frogs.jpg (37.43 kB . 1024x765 - viewed 1084 times)

The newest one is looking quite nice for the used settings, and I now already happy with that quality as a baseline!
Title: Re: Anycubic Kossel (pulley)
Post by: Deity on October 30, 2017, 02:07:18 PM
So, now my only remaining current big issue is with leveling! Auto-leveling in itself, seems to be working ok, maybe?

I mean it runs, then prints an uneven first layer (correcting for the bed slant/deformities?) and if I rotate the bed around
auto-leveling correcting seems to apply to where the regions where rotated to.

The problem seems to be how it is correcting, printing a very thin layer on the "slanted up" part of bed leaves me with situations
like this:
*hexes.jpg (64.12 kB . 1024x765 - viewed 1099 times)

Which is not very desired, those holes where only supposed to be showing on one side, and those lost corners are because
the height of the model there isn't very high....

I actually tried to raise the bed on the side that is detected as "slanted down" but strangely enough it doesn't seem to have made any difference!
Title: Re: Anycubic Kossel (pulley)
Post by: Deity on November 13, 2017, 04:08:05 PM
After fiddling and re-fiddling with leveling I've dropped auto-leveling altogether.
Had to spend more hours than I would like manual leveling (which is conceptually simple but in practice turned out to be a pain),
but managed to open the door for a lot of hours printing and this is what I been up to, for a friend:

*catan3.jpg (241.75 kB . 800x598 - viewed 1293 times)
Title: Re: Anycubic Kossel (pulley)
Post by: Bajdi on November 13, 2017, 04:48:04 PM
Oh la la, what a comeback  >:D
Title: Re: Anycubic Kossel (pulley)
Post by: Deity on December 21, 2017, 10:10:21 AM
Finally last week I received the alu bed mk3 and was able to implement the bed leveling setup I was looking for!
For the time being I will only use it as a cold bed, and as such I haven't even bother to wire it!

It still took me the whole Saturday afternoon to level it properly after I had installed it it, but since I only needed to do slight tweaks
once in a while and I've been printing galore practically all evenings since then.

I am quite happy now, this bed as far as I can see is flatter than the original glass plate, and for most prints I am being able
deposit the first layer at the right distance so that prints neither over-adhere (thus leading to me ruining the adhesion sticker
faster while prying pieces of it) for under-sticking (leading to.. well you know).

I also got a longer cable for the E-stepper and thus mounted the E stepper a bit higher up. I considered mounting it in the upper triangle
but so far haven't found any place where it looked pretty. Also, despite an horizontal spool holder probably looking prettier, I think as is now
it is working better. I had no issue so far with any spool and also I am able to use unspooled filament quite easily.

*anycubic-upgrades.png (720.84 kB . 890x586 - viewed 1200 times)
Title: Re: Anycubic Kossel (pulley)
Post by: jinx on December 22, 2017, 04:29:30 AM
looking rather finished that delta, does the bed really need 6 bolts? thought 3 point leveling do just fine.
how thick is the bed plate" like the sunken bolt heads
Title: Re: Anycubic Kossel (pulley)
Post by: Deity on December 22, 2017, 06:23:15 AM
Yeah it was finished a while ago... this is just better finished, lets say... you should know... there's always one more improvement one can make :P

3 of the bolts are just to make sure the spring doesn't bounce off place, only 3 points actively level the bed, the other 3 passively push the bed upwards with the spring, which is quite nice because previously I was noticing that inbetween leveling/fixing points the glass bad would sag.

The bed plate should be the standard alu bed mk3... let me fetch the calipers... calipers say 3 mm

And yeah that was another thing I wanted, nothing sticking above the plate surface, before I had plastic screw and nuts pots/fixing/leveling points that would stick above it, and kept getting in the way when it was time to pry prints off the bed.
Title: Re: Anycubic Kossel (pulley)
Post by: Deity on December 30, 2017, 06:43:18 PM
Well, soon after my last post of rejoicing... I started having recurrent jamming on the hot end, after quite many hours with only a very jams. At first I though the filament I just changed to was to blame, then trying with ones that were working flawless before I got the same jams, so I guess the problem was at the hot end... but long story short I ended up replacing the heat break (and the heat block just because I wanted to) -- that seemed to solve the problem (let's hope I am not jinxing it be writing it this time).

In any case I took the chance to print my actually first benchy, so here it is

*3Dbenchy.png (69.12 kB . 1024x717 - viewed 981 times)
Title: Re: Anycubic Kossel (pulley)
Post by: Deity on December 30, 2017, 06:54:32 PM
So, just before the aforementioned (already solved) clogging issues below is what I have been printing... and those are above 100 hours printing time

*catan5-6p.png (64.32 kB . 1024x532 - viewed 935 times)

*playerpieces.jpg (79.72 kB . 1024x704 - viewed 936 times)

*wheat_sheep_wood_ore.png (83.69 kB . 1024x712 - viewed 995 times)
Title: Re: Anycubic Kossel (pulley)
Post by: mogul on December 31, 2017, 01:24:41 AM
In any case I took the chance to print my actually first benchy, so here it is

Looking good. How did the text on the bottom and stern turn out? I rarely have much luck with those.
Also, what speed and layer height did you print her with?

Title: Re: Anycubic Kossel (pulley)
Post by: Deity on December 31, 2017, 09:04:23 AM
I can read the bottom perfectly, the only slightly issue was due to a piece of plastic from a previous aborted print that I still haven't managed to scrap off the bed.

As for settings 0.1mm layer height @ 60mm/s