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Zahnriemen und Pulleys, Lager und Schrauben, Gewindestangen und Muttern, ... Mechanik eben.
Re: DRV8825 tiny trouble - 10 Jahre zuvor
Sorry for confusing you, my main issue is E, i just thought that the sound my X made is somehow related because my assumption was that the timing would be wrong. Since I lowered the speed, XYZ are fine, but the extruder issue is still there. I used about every stepper driver I had on that axis, and the only ones that work are the A4498s. Neiter the GE tech 8825s of the other axes nor the one othevon Yellobello - Controllers
Re: DRV8825 tiny trouble - 10 Jahre zuvor
Ok, but again my problem is only for the E axis. XYZ behaves mostly fine. I just did a 10 hour test print with 3 DRV8825s for XYZ and one A4998 for E since i can't get any of my spare 8825s working with E. In all arrays that get defined it goes like this : #define variable {X,Y,Z,E}, so the last value is for E. In all cases, for Max feedrate and Steps per unit, my E value is between my XY and Z vvon Yellobello - Controllers
Re: DRV8825 tiny trouble - 10 Jahre zuvor
Yeah, the fault follows, even when i swap the stepper driver. Also when I swap the stepper motor. My settings are: #define DEFAULT_AXIS_STEPS_PER_UNIT {133.67,133.67,5120,254} // for DRV8825; for A4998: {66.83,66.83,2560,254} #define DEFAULT_MAX_FEEDRATE {500, 500, 4, 25} #define DEFAULT_MAX_ACCELERATION {500,500,25,100} #define DEFAULT_ACCELERATION 250 #devon Yellobello - Controllers
Re: DRV8825 tiny trouble - 10 Jahre zuvor
But in this case, i´ll get an cold extrusion prevented error, right? Maybe I still have to tune step width... I noticed when homing, my x axis makes a very fast move and in the middle of this move it looks it skips alot of steps.. at least it makes this sound. I don´t know if any real steps are lost, but its definitely the very fast move. It occurs on no other part of any print. Where can I tunevon Yellobello - Controllers
Re: Cheapest effect board? - 10 Jahre zuvor
I think the cheapest board around is Sanguish, I just learned that today, a few posts below. Its pretty basic but does the job of a XYZE printer with heatbed. Another cheap option is RAMPS1.4 with an arduino mega clone and A4998s. You get them very cheap from china or ebay or dx.comvon Yellobello - Controllers
Re: Servo wobbling, basic electronics question inside .. Help needed - 10 Jahre zuvor
Ok, first off, i did not manage to solve the problem in a traditional way. All the good hints did not change a thing. Strange, right? What I did not do yet is using another pin, maybe that will help. Also I got a digital servo for trying, I'll let you know if that helped. However, I found a way around this. Marlin has an option to shut off servos after some miliseconds. Fiddling arround with thatvon Yellobello - Controllers
DRV8825 tiny trouble - 10 Jahre zuvor
Hi, since I got 5 Getech drv8825 chips for free, i thought i´ll give it a try. XYZ works great, torque is still good even with 32/microstepping and the whole thing is a lot less loud. What not works is my extruder. I can´t get it moving,any idea why? Firmware-wise all I changed is doubling the steps per unit value from #define DEFAULT_AXIS_STEPS_PER_UNIT {66.83,66.83,2560,254} // A4988 to #von Yellobello - Controllers
Re: Marlin Babystepping - 10 Jahre zuvor
I tried babystepping together with autobed leveling.. it seems not to work, since the lcd shows no value except babystepping Z, no number or anything. Could this have to do with ABL?von Yellobello - Firmware - mainstream and related support
Re: RADDS First Impressions and Mini Review - 10 Jahre zuvor
Two questions arise when i read your thread: How does your stepper's torque behave when you use 128/th stepping? It should be close to zero using microsteps that small... I already noticed a huge drop using drv8825 32 microsteps compared to 16... Is the resolution gain worth it? Does the full graphic 12864 LCD also work with RADDS? Thanksvon Yellobello - General
MINTEMP triggered on both, bed and nozzle - 10 Jahre zuvor
Hi! In the middle of a couple hour print, MINTEMP got triggered on my prusa with RAMPS/marlin. The problem is, it does not seem to be thermistor related since both thermistors tell me they are at 0 degrees C and it does not seem to be wire related since bed and nozzle use different wires. strange, right? turning on and of as well as rewiring does not help, still mintemp triggers... yesterday Ivon Yellobello - General
Re: Marlin Babystepping - 10 Jahre zuvor
Very nice. I think that the two button solution is perfect, even when you have a lcd. The problem with babystepping is that it is mostly needed during the first layer, depending on model size and print speed, and so when you have to go through the menus to activate babystepping, the print is already halfway through the first layer. Would the two button solution also work when the lcd is active?von Yellobello - Firmware - mainstream and related support
Re: Servo wobbling, basic electronics question inside .. Help needed - 10 Jahre zuvor
There´s digital and analog servos around.... judging from the low cost my servos were, maybe it´s worth trying a digital servo?von Yellobello - Controllers
Re: Servo wobbling, basic electronics question inside .. Help needed - 10 Jahre zuvor
Ok, thanks for your hints, this is what I tried now: -Used a shielded USB Cable (cut the plugs off and soldered the mesh to GND) ----> No change -.Used 100uF and 470uF caps (10 and 35v) -----> No change in behaviour Grrrrrrr!1!111!!!! I doubt that clean 5V could fix the issue, but it´s worth a try.. i only have a 7905 around, which makes -5V, but that´s ok, right?? If i just swap the polvon Yellobello - Controllers
Re: Servo wobbling, basic electronics question inside .. Help needed - 10 Jahre zuvor
Hi, what do you mean by shielding? And by local regulator you mean a 5v source that has nothing to do with the ramps at all? I could use a USB power supply for that... Another option would be using a 7805 or similar... What would a good sized decoupling cap be? Still in the uF range? Thanks!von Yellobello - Controllers
Re: Servo wobbling, basic electronics question inside .. Help needed - 10 Jahre zuvor
Just learned that servos are pwm driven, so maybe the capacitor is not a good idea, I thought they are voltage driven. Any othe thoughts?von Yellobello - Controllers
Servo wobbling, basic electronics question inside .. Help needed - 10 Jahre zuvor
Hi! I just set up auto bed leveling and it could work much better. The problem is that my servo is wobbling a couple of degrees back and forth, especially during stepper movements (z-axis). It seems to me that some current is leaking somewhere on my RAMPS board and so the servo is inaccurate during movement. If you wish, i could measure a bit with a scope and post pictures. Do you need a videovon Yellobello - Controllers