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Slow homing also helps rescue things. With delta printers , by their very nature, having so many "open" belts. arms & pulleys moving, its easy to get a tool or loose filament trapped somewhere which can cause a disaster.
At least with a slow home speed you stand a chance of taking action
As a side note i really quite like the Repetier firmware. I was ( i think like many others ) a bit wary
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bigfilsing
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Delta Machines
Oh yeah and before i forget
get a cable tie and strap the extruder wiring to the top of the extruder stepper motor.
as you have it now the stepper motor connector will take all the load from movement ( not good) and you stand a chance that the wires may go into the extruder drive gear ( definitely not good )
And how many teeth are on the extruder little and big gear ???
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bigfilsing
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Prusa i3 and variants
OK the Marlin version you have is a development version and can contain all kinds of stuff that may upset your printing . You really should either download a stable version ( but the link has problems as weve noticed ) or download from my link
Trust me. development version are for developers !! We have no way of knowing what they are experimenting with and the effects it may have !!!
SO when yo
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bigfilsing
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Prusa i3 and variants
In order to help you set up config.h we need to know some more about your machine
what drives the x and Y axis
what kind of belts and drive pulleys ( for example T2 belts on 16 teeth pulleys)
what kind of threaded rod drives the Z axis
what kind of extruder are you using
do you have a heated bed
what kind of hot end are you using
a few photos would help as well
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bigfilsing
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Prusa i3 and variants
I just checked and for some reason the stable links back to the development version ...strange and no idea whats going on there.
grab 1.0.1 stable here
Link valid for 24 hours
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bigfilsing
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Prusa i3 and variants
You're welcome Glad it worked.
I'm a believer in slow and steady. I see quite a few people ( on you tube) that have the homing rate way to high (IMO) and the carriages bang into the top end stops. Can't be good for frame or micro switches.
Ironically homing is the first part of printing and prints can run into many hours duration. So if a couple of seconds homing can protect frame and microswitch
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bigfilsing
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Delta Machines
Where did you get Marlin ?? the config h you posted looks like its for a very specific machine with 4 hotends !
I would recommend getting a clean new version of Marlin>
then replacing the config.h file with the one posted by vegasloki above.
( note : this configh assumes you are using full micro stepping ....all jumpers are installed on the ramps boards under the stepper drivers)
That would
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bigfilsing
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Prusa i3 and variants
well if you load Marlin then try again and if it stll doesnt work post your config.h file so we can take a look
you could also let us know your belt types / pulley teeth etc
also once Marlin is loaded send an M119 command in pronterface to check the endstop status . Should show triggered or open
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bigfilsing
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Prusa i3 and variants
OOZNEST easy winner
45 quid discount till 25 march
If i were you id order without the ABS and start your printing life the easy way with PLA
Also forget the kapton tape ...just use UHU stick on the glass bed ...nothing beats it
Good luck
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bigfilsing
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Prusa i3 and variants
QuoteKT1986
Ok so after doing the comparison between the config files and all that I still have nothing, sort of. I accidentally hit one of the home buttons and it tried to home, which cause the bed to move to the end of its travel. Did the same thing with the x axis and it did the same thing. But if I click any of the move buttons to move it in either direction it just makes noise and does nothi
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bigfilsing
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Prusa i3 and variants
I have mixed feelings on "budget" stuff Ive had some good experiences with it on the whole, but of course occasionally theres a dud.
Its worth while checking the Ramps board over when they arrive . Quite often the solder work isnt as good as it should be.
Ive recently had a brand new Arduino mega with a bad digital out pin that wont play nice ( Extruder channel wont reverse/ retract) so expensiv
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bigfilsing
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Delta Machines
Ok managed to organise some 16 teeth drive pulleys.
Much better prints but i can tell the issue is still there just masked now by the better resolution .
Anyway at least now i have a delta printer that will produce reasonable prints.
Thanks for sticking with this guys ...much appreciated and if you do have any further ideas as to cause id love to hear from you.
Cheers
Phil
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bigfilsing
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Delta Machines
Well i tried the 40 steps but no joy. Same jitter
if i really slow the print down and lightly touch one of the carriages while in motion i can feel the "pulses" in the carriage.
next step is with smaller ( less teeth) drive pulleys but i already have a feeling this will just scale the problem down ..report back soon
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bigfilsing
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Delta Machines
i recently had to install repetier while investigating a problem on my machine and had the same speed issues
when you open repetier host and connect to your printer go to the config tab menu and 3rd one down is " Firmware Eeprom configuration" click that
( it will be greyed out if your not connected to the printer)
There you can adjust all the settings you need . You have to click OK to have
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bigfilsing
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Delta Machines
thats not good
anyway
if youre lucky the automatic fuses saved the board . Its unlikely thou as they seem to work when they feel like it rather than when its needed
Separate the 2 PCBs and try the arduino mega on its own. See if you can connect to pronterface or upload a simple sketch. You may have blown the voltage regulator on the mega
which can be fixed but its a tricky job
maybe take a l
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bigfilsing
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Delta Machines
Quotedougal1957
Quotebigfilsing
well i retraced my research and found the reference to the 36 tooth timing pulley / drive cog here >
so that cant be it either.
Running out of options
Actually you may have hit on something there cos at 44.44 steps there will be a lot more interpolation going on than if you have an even number of steps such as 80 in the case of 20 tooth pulley's
There is a th
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bigfilsing
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Delta Machines
well i retraced my research and found the reference to the 36 tooth timing pulley / drive cog here >
so that cant be it either.
Running out of options
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bigfilsing
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Delta Machines
QuoteAndrewBCN
Indeed it's a very strange problem. I am having a hard time understanding why the test program results in smooth motion of the steppers whereas all firmwares you have tried until now result in jittery motion.
it still seems to be based around delta motion ...when an XY position at Z height is produced. Very confusing
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bigfilsing
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Delta Machines
well it isnt the stepper motors either ...just swapped em out and exactly the same. beautiful basket weave
This is getting to me. I must have missed somethign somewhere
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bigfilsing
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Delta Machines
While contemplating swapping out my stepper motors i realised that i am running 36 teeth T2 drive cogs ...hence the 44.44 steps/ mm
May not be the root cause of the issue but it isnt helping thats for sure.
I seem to recall them being listed in one of the online BOM's that i looked at prior to building. I wonder if i can find smaller ones , i should have a some somewhere
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bigfilsing
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Delta Machines
QuoteAndrewBCN
Pardon my ignorance, but what test software is that?
Its a simple arduino sketch for ramps that runs the steppers and cycles the heater and extruder outputs. Quite useful for bench testing
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bigfilsing
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Delta Machines
QuoteAndrewBCN
The voltage specified for the steppers usually does not matter, because the drivers take care of regulating the current in any case.
What microstepping rate are you using: 1/4, 1/8, 1/16?
1/16 and my steps/mm and size / scale of objects printed seems to confirm that
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bigfilsing
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Delta Machines
QuoteAndrewBCN
From this early post of yours it seems that when the steppers move individually there is no jitter, is that correct?
Can we assume there is jitter only when two or three steppers move simultaneously?
there doesnt appear to be but of course other than the test software its hard to determine with a delta where all axis move
Edit ...just ran the test software again ( with the extr
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bigfilsing
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Delta Machines
QuoteAndrewBCN
Yes, I agree about the heatsinks on the stepper ICs. And I also agree that their overheat protection circuits are not tripping (the steppers would simply stop for a few seconds until the drivers cool down by 5 or 10C, there is a hysteresis). However to eliminate any weird effect of the heating you could add a small fan on a bracket on top of the RAMPS.
Yes it is my intention to co
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bigfilsing
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Delta Machines
QuoteAndrewBCN
Quotebigfilsing
Just tried Repetier and after some tweaking with homing and feed rates managed to print ... Same result
...
Good! We can eliminate the firmware as a source of the problem, and by the same token we are now absolutely certain it's not the "8-bitness" of the AVR either.
How are you cooling the RAMPS and stepper drivers? Any fan?
Not at all at this stage of the build
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bigfilsing
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Delta Machines
Just tried Repetier and after some tweaking with homing and feed rates managed to print ... Same result
SO thinking that all options have been explored it could only be the stepper motors !!!
Im using Wantai 42BYGHW609's purchased from E3D
Looked at the spec sheet on the wantai site and they are only rated at 3.4 volts !!!!
They have a 6 pin plug socket. Of which only 4 are attached ( wiring
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bigfilsing
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Delta Machines
QuoteAndrewBCN
How did you configure the jumpers for the microstepping in the RAMPS? What kind and model of Power Supply are you using? Is there any mechanical play in the arm linkages? Could you take a picture of the effector?
Yup tried all of that.
Jumpers all good
tried 3 different power supplies ( 1 converted PC & 2 proper power supplies)
no abnormal play in the linkages
pics attached
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bigfilsing
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Delta Machines
so i loaded the suggested T3P3 Marlin and
was very careful not to alter anything other than config.h
In config.h i changed the following to suit my set up
#define DELTA_DIAGONAL_ROD 217.0 // mm (T3P3, default 215)
#define DELTA_SMOOTH_ROD_OFFSET 141.1 // mm (T3P3, default 145) //145.1 = redkossel
#define DELTA_EFFECTOR_OFFSET 33 // mm (T3P3, default 19.9)
#define DELTA_CARRIAGE_OFFSET 22 /
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bigfilsing
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Delta Machines
HI
Before trying more FW options i also printed a cylinder to see what something other than straight lines would produce. Judder still visible
Cheers
Phil
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bigfilsing
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Delta Machines
Test pictures
E3D V6 hotend with stock 0.4 nozzel
Verbatim Black 1.75 PLA @ 195 DegC
test cube 20 X 20 X 10 mm
printed hollow with 0.8mm wall thickness
Print stopped at top when bridging starts
You can already see the judder in the brim thats laid down at 10mm/s
Other pics attached
Now going to try the dc42 suggested Marlin and then Repetier
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bigfilsing
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Delta Machines