Show all posts by user

Re: Problem connecting with RAMBo - 10 years ago

I have only used one, but mine was not USB powered (your might come with a jumper or switch though). Till I provided power to the logic of the board (not to the motors) it refused to work.

by misan - Controllers

Re: help with SMPS - 10 years ago

Yes, next step is to scope both the good and the bad one, as primary inspection of current sensing resistor and related components render showed no error. Thanks again.

by misan - Controllers

Re: New Pololu DRV8825 Stepper Motor Driver: A4988-compatible with more power! - 10 years ago

According to this page: Current limit (A) = Vref x 2 so 0.5V will mean 1A and 1V will mean 2A (you do not want to go that far most likely, unless you have additional cooling). Max value could be 0.8V (or 1.6A) or a bit less (without a cooling fan).

by misan - For Sale

Re: help with SMPS - 10 years ago

I guess I should have been more specific (many LED stripes do include groups of serial leds plus resistors designed to be powered at 12V or 24V). This type of supplies is what I am dealing with for RepRap use. Most of them work ok for me, but from time to time I get a defective unit. When that happens I try to repair it if possible. If a component blows up then it is easy to spot, main switch

by misan - Controllers

help with SMPS - 10 years ago

I've got a couple of faulty power supplies, 12V/20A that are sold as power supplies for LED stripes. Both exhibit a similar failure but I cannot figure out how to fix it. Both provide 12V without load, but as soon as load if applied (even if only 100mA load) the power supply will cut down the power, it will to restart, and the cycle will repeat, as if it was overloaded (the led in the power supp

by misan - Controllers

Re: Moineau stepper extruder - 10 years ago

Some more testing was done and videos were attached to the thing Self-priming is quite limited to a few inches of height and only if the stator is lubricated with some liquid before. But for my project I am now testing an auger valve:

by misan - Paste Extrusion Working Group

Re: New Pololu DRV8825 Stepper Motor Driver: A4988-compatible with more power! - 10 years ago

You just need to add *2 in those axis you change the driver: #define DEFAULT_AXIS_STEPS_PER_UNIT {78.7402*2,78.7402*2,2*200.0*8/3,2*760*1.1} // default steps per unit for Ultimaker

by misan - For Sale

Re: New Pololu DRV8825 Stepper Motor Driver: A4988-compatible with more power! - 10 years ago

Plain and simple, just replace the A4988-based by the 8825-based one, touch no jumpers and you have it. Please note that because you now have 1/32 microstepping you will need to adjust this axis calibration value (times 2).

by misan - For Sale

Re: Calibracion motores - 10 years ago

¿Cómo ajustas la corriente? Te recomiendo el procedimiento descrito aquí:

by misan - RepRap en Español

Re: EJE z se descalibra - 10 years ago

La calibración dice cuantos pasos son necesarios para que el eje avance un milímetro. Los tornillos tienen un paso que no varía con el tiempo, así que imagino que tu problema es que el motor no gira como debe más que que pierda la calibración. Si el motor no hace el número de pasos ordenado el hotend no se eleva adecuadamente y la pieza sale más achatada de lo normal ¿es eso lo que te pasa?

by misan - RepRap en Español

Re: RepRap 3DR Delta printer Released - 10 years ago

Hi Alex, It is unclear to me whether your gears have a point where more force is needed and motor skips or if the driver is overheating and thermal shutdown is kicking in. You can rule out the latter by checking the chip temperature on your pololu. While a 2.5A motor can happily handle that current, our common electronics (A4988-based pololus) cannot deliver much more than 1A without additiona

by misan - Delta Machines

Re: Moineau stepper extruder - 10 years ago

I did the test, oogoo silicone worked wonders and the resulting pump can prime itself (I was testing with fabric softener).

by misan - Paste Extrusion Working Group

Re: Problemas imprimiendo en PLA - 10 years ago

El PLA se dilata al calentarse. Eso hace que roce más con el interior del hotend y que requiera más esfuerzo para seguir extruyendo. A veces esto interrumpe por completo la extrusión, otras la debilita, saliendo menos material del que debería. Y esto suele suceder al rato de comenzar a imprimir, que es cuando el calor va subiendo por el hotend. Para solucionarlo muchos hotends requiren refriger

by misan - RepRap en Español

Re: mi impresora no imprime circulos perfectos - 10 years ago

Parece que tienes las correas flojas (no suficientemente tensadas). Pero cuando están bien tensadas también puede pasar si alguna de las poleas está floja y patina sobre el eje del motor.

by misan - RepRap en Español

Re: Moineau stepper extruder - 10 years ago

Thanks a lot for the Oogoo tip. I'm just reading how to make it here: I will report back with my results. I really hope it will prime itself.

by misan - Paste Extrusion Working Group

Re: Moineau stepper extruder - 10 years ago

I am modelling the cavity of the stator as a 3d part. Next I will make a silicone model out of it. That will become my rubbery stator. I hope this way I get a good sealing for the rotor, as I have not had much luck with my quite viscous paste till now.

by misan - Paste Extrusion Working Group

Using IMUs on moving carriages - 10 years ago

One of the bad things about most of our bot's design is the open-loop nature using stepper motors (without an encoder). It ocurred to me that an accelerometer on moving carriages could provide a feedback loop that might be used to detect and correct skipped steps (if I am watching my printer and the head bumps into something missing steps I can fix that by pausing and homing the head before res

by misan - Developers

Re: que pasa con los overhangs? - 10 years ago

PLA y ABS precisan diferente temperatura en la cama (70 frente a 110C) y dependiendo del filamento también diferente temperatura de extrusión (180 frente a 230C). No aprecio en la foto el problema que refieres. El que deposite más plástico en la primera capa es una opción de Slic3r que puedes modificar y que pretende propiciar una mejor adhesión a la cama.

by misan - RepRap en Español

Re: no funciona los motores - 10 years ago

Mide la tensión en los pololu (entre GND y VMOT). Si tienes también 12V sigue buscando, pero si no, se trata de un cortocircuito en la RAMPS (o bien un funcionamiento deficiente del limitador de corriente).

by misan - RepRap en Español

Re: My DIY printer - 10 years ago

Sometimes this happens because Z-axis feed rate is too-high. I would try with 1mm/sec or so. You can set that for the MAX_FEEDRATE of your axis or if using Pronterface you can set the proper value in the Z: textbox (60 mm/min). If you change to full step you need to divide the calibration you have for Z-axis by 16 (as x16 microstepping is what you get when you have all three jumpers in). Howev

by misan - Developers

Re: que pasa con los overhangs? - 10 years ago

La solución más simple es imprimir dos a la vez. El tiempo extra permite que las capas se enfríen bien antes de depositar la siguiente y al terminar tienes la polea que querías y una de recambio.

by misan - RepRap en Español

Re: Problemas con el ABS - 10 years ago

Es similar a este otro hilo: Las mismas soluciones te puede ayudar.

by misan - RepRap en Español

Re: MINITRONIC - 10 years ago

Necesitas conectar el thermistor. Si no cree que se ha desconectado por error y no permite mover los ejes o imprimir. Si no dispones del mismo, Configura el primer sensor de temperatura con el valor -1 para desactivarlo y el error ya no se produce aunque no tengas termistor.

by misan - RepRap en Español

Re: curling en esquinas? - 10 years ago

Si mejoras la adherencia de tu base el problema se reducirá. Puedes usar laca o solución de acetona con ABS sobre el cristal. También puedes colocar cinta Kapton sobre el cristal y trabajar entre 110 y 120C. También puedes emplear el "brim" de Slic3r que te crea un contorno adicional alrededor de la pieza de muy poco espesor para que tenga más agarre (y que luego se arranca). Con laca puede q

by misan - RepRap en Español

Re: Problemas del extrusor - 10 years ago

El atasco de PLA se produce en algunos casos porque se calienta la parte superior del hotend. Por eso en algunos recomiendan disponer de un ventilador que mantenga fría su parte superior. Me temo que es lo que te puede faltar. Respecto a la segunda cuestión, aquí puedes encontrar la respuest

by misan - RepRap en Español

Re: Want to buy a high-precision RepRap in Spain - 10 years ago

I think you should have a look at a reprap from someone in Madrid (you could ask in the Spanish forum). It may surprise you how well these machines can work (sometimes better than commercial ones).

by misan - Wanted

Re: Want to buy a high-precision RepRap in Spain - 10 years ago

High-precision is an elusive concept, almost any RepRap printer can do 0.1mm layers but printing times will go up as layer height is reduced. Cheapest ready-to-use commercial printer in Spain I'd say it is mini UP! 3D at around 850€ ($1150 taxes included). If you are looking for something below that price range you'll have to go DIY or find a used RepRap.

by misan - Wanted

Re: My DIY printer - 10 years ago

In microstepping you cannot de-energize the motors as they cannot hold statically any other than full step positions. You can configure your firmware to not put driver to sleep mode on Z axis. My advice is to keep all the axis energized if your are using microstepping on them.

by misan - Developers

Re: el motor del extrusor ha dejado de girar - 10 years ago

Los drivers se pueden romper, cuando eso pasa a veces el motor solo vibra pero sin girar. Prueba a cambiar el driver por el de uno de los ejes que funciona y mira si entonces el extrusor vuelve a funcionar. Si es asi la solución es comprar un nuevo pololo/stepstick.

by misan - RepRap en Español

Re: PRIIMERA IMPRESIÓN - 10 years ago

SI, aunque también puedes eliminar directamente esas líneas. También elimina las M109 S200.

by misan - RepRap en Español