issue with DIY Kossel 3d Printer

[SummersideGuy]

I was actually considering trying this out a few times but unsure of the feature. I may give a go tonight on something I know fails to see how it goes.

[HooeyB]

Hey, first check to make sure all belts and pulleys are tight. Als make sure the print has isn’t wobbling then if that fails u may need to adjust the current to the stepper drivers

[edakmiller]

A shift like that is typically caused by the bed moving because parts are attached to it and being hit by the head. Secure the bed as best possible and use the zlift feature as previously mentioned. My kossel mini prints multiple objects like a champ, my only issue is stringing which I can’t eliminate.

[SummersideGuy]

My Glass bed is secured down and cannot shift side to side as I have tabs fixed to the 2020 fram with rads exactly matching the diameter of the glass bed. There is no play. I never have a problem with stringing unless I am printing in flexible filament. My printer has good days where it prints great and mediocre days where it prints soso. I have been into this now for about 5 weeks and had to do a lot of research and reading up to get it this far. It is a DIY kit that had no firmware when I got it. If I can get past this one last obstacle I’ll hopefully be fine

[edakmiller]

If your printer is homed, can you shift the head by Hans such that it doesn’t move back?

[SEngineering]

It definitely sounds like your move speed is too high (not your actual printing speed, but the speed for moving between parts) and/or your motor acceleration values are too high in firmware. To test lower acceleration speeds without having to reflash your firmware, go to control -> motion -> scroll down until you see acceleration and lower to 2000. Than scroll down further and change each of the individual motor (x, y, z) acceleration values down to 7000. Start there and see if it is improved.

[SummersideGuy]

I am not quite sure what you are asking here.

[SummersideGuy]

My acceleration is at 3000 and my x,y,z acceleration values are all set to 2000 already

[ImpulsiveJames]

You have a fan like this?

If it is warping, you’d see a ton of it on the bottom half of BB-8 (assuming you’re printing the whole sphere and not half at a time).

[SummersideGuy]

This is usually the quality of my prints, this is one of a bunch of parts I printed this past weekend for a new kossel project I want to start myself with a much larger printer area. As you can see I have no issues with quality, distortion or leveling, its just a lot of the time with multi separate rises I get the issue i originally described, now the PLA in the pic i have not had that issue with but I have not tried any of the usual problem parts I get this issue with with the PLA yet. When I get a moment I will attempt a problem part and upload the results for a better assessment

[MD3DDelta]

Hello i had the same issue , after doing all the things they mention here ,what is right ,

i came to dicover that 1 motor was bad ,

he skipt an step or 1-2 . i had lose him from the belt and turned it by hand ,at an piont turning with same force by hand the motor feeled like he had an skipping,and crackfeeling, after replace the motor all went good no problems anymore since then .

the motor was striped and the failure was 1 defect barrel in the tiny bearing. I think there was tomuch tension or force on the motor, in the past.

so if nothing works try this .

When it happens to me again i check the motors first, this is much faster then do all the settings and so on .

but till now i have no problems at all.

cheers . mike

[SummersideGuy]

My fans are exactly like that. The BB8 I am printing is 3 parts, center hub for mechanics and two side pieces. I get some curl up at bottom right on platform but no where else on him. I do not have a heated bed

[3dpk]

Such error during the print may be cause by few reasons

1- while you were printing the printing head encounter an obstacle which prevent the head to move correctly in the X Y dimension, probably cause by an over extrusion of the previous layers, an over extrusion may pile up ever several layer before it become an issues I suggest diminishing the over extrusion parameters or increase the layer hight

2- While you were printing a resistance may have been encounter in X or Y axis both at the same time is not probable which can have prevent the printing head to move to its proper position, for that check your assembly and grease the X and Y moving roads with a white grease for metal

3- The last probable cause is way more touchy to adjust, each motor you have in your printer is control by a step motor chip, these chip have a small calibration knobs which control the amount of power sent to the motor for each move, increase it and you will provide the motor with more power to surmount small obstacle if you give to much the motor will overheat and lose longevity, not enough power and you may encounter problem like your describing, But I repeat this is very tricky and such be done by expert 3D technicien.

Hope these will help you, Have 3D FUN

Yvan

[HooeyB]

Hey FYI adjusting the stepper drivers isn’t that hard but you do need a multi meter and another place you should check for help is the reprap mIRC channel. If you google reprap irc u’ll find a link that will take you to wiki and then another link to take you to the channel. If you need assistance adjusting the drivers send me a message and I can walk you thru it

[SummersideGuy]

I will do that as a last resort however I am leaning towards the the solution of raising Z on retraction to see if this solves the issue, as it only occurs when I run into the print repeatedly, which seems to occur when I have multiple rises and the PLA starts to curl upwards

[ImpulsiveJames]

You could try printing slower. If you put your fingers on the stepper drivers, do they burn you? Are the steppers themselves hot? The current on the stepper drivers may be up to high and letting the steppers lose steps. You can turn down the current, or add an electronics fan.

[AdonisPT]

Hello. I’m not familiar with delta printers but I think it hás to do with material warpage and maybe material to platformas adhesion. Do your prints stick to the platformas or do the wider ones end up with onde corner lifted up? I had that problemas with ABS And some times the print head just knocked the piece of the bed. And some other isue to pay attention, is you extruder over extruding? Check and calibrate your E-steps.

[benwfowler]

I’d try tightening your x belt as a first step

[glolines]

Try adjusting your z raise height that way it lifts a little most are set to zero but if you built it your self it might not be quite true and maybe slow your non print moves to be slower

[n23d]

Yes when printing multiple items the head has to cross the external border which is the most likely time for a crash to happen. Most of the curled edges happen when you are extending a wall in a nonvertical direction like 45 degrees. A flatter angle say 60 degrees to 90 degrees the extension sags. More vertical and the structure is solid so no curl however there is a range where the conditions are just right those edges curl. If they curl enough and they have time to fully cool and the head comes zooming in and trys to cross the border the stepper stalls any you loose sync.

Your slicer program probably has a setting that can help. In your slicer settings look for a settings called Z hop: or something like that. Set it to 1 to 2 mm. You may have to turn on retraction to get it to work. It will cause the head to move up in the Z everytime it does a non extruding move that crosses a border. Move inside the next border and drop back down to printing height. It will slow down the print a little, more if you have many separated islands of area being printed. However if your prints no longer fail its worth it.