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Printing issues ...
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Thanks again Nophead. I have other questions/thoughts on the change over like maybe I can make my heat bed work now I had done away with it on the Melzi. but this is the isn't the right thread. Is there a good general thread for that sort of thing?
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pmzielinski
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Mendel90
Well Z on the Melzi quit again while my son was trying to print something for school nice huh! So Dumb question if I replace the Melzi with MEGA 2560 R3 + RAMPS 1.4 + A4988 Stepper Drivers and upload the marlin set up just as I have it now on the melzi will I be back to where I was? I've been too busy with work lately can't get my head around it. Hoping you guys can help.
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pmzielinski
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Mendel90
Has anyone tried to print on a piece of aluminum storm window screen? Sort of like a permanent raft? my thought is it would give texture and possibly eliminate the need for heating the bed?
I plan to get a piece this weekend and give it a try. I'll let you all know what I find out.
by
pmzielinski
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General Mendel Topics
Unfortunately 2 years ago the first time I tried to "turn on" the heated bed it majorly fried the factory surface mount mosfet and the circuit traces to it which was why I used the HUF76423P3 as a replacement so I could bend the legs to make the connections. Then I epoxied the area of the board where the legs connect as the traces were fragile. So using the FDD8870 won't work but I could look for
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pmzielinski
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Mendel90
I used this one when I replaced it when it fried. Do you think it'll be ok? says its good for 85w and the Fairchild FDD8870 says 160W. Even if I have to set a limit on the heat I'd like to at least turn it on
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pmzielinski
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Mendel90
Nophead you're the best! Back up and running as before. found a trace to the stepper driver that was pulled up. I got it connected and we're as good as we were. Thank you!!!
Now if I could warm the bed up a little without fryin the mosfet any thoughts. (my previous post )
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pmzielinski
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Mendel90
Well I did make my way around the chip attempting to resolder but as you know they are tiny connections and my fear was bridging. it is possible that I missed something but does that make sense? or is it likely that I have more than one problem?
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pmzielinski
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Mendel90
Gave soldering the chip a try and gained something now the z motors buzz but don't turn and do stop when the endstop switch is triggered. Am I still looking for a bad solder joint or something else?
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pmzielinski
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Mendel90
last night while jogging Z with pronterface I gently pressed on the stepper chip for a moment I got some oscilation of the z motors, but aparently this didn't get a good enough connection to get actual movement. So now I know what it is thanks nophead. Tonight I'll sharpen up the tip on my soldering iron and give it a shot at soldering those little connections.
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pmzielinski
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Mendel90
I'll take a look at solder joints when I get home, but the motors remain free. Thanks for the input nophead. I will let you know.
by
pmzielinski
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Mendel90
my Z axis stopped working for no aparent reason after completeing a print on Friday night. won't home can't jog with pronterface. it finished that last run just fine. checked endstop its operational, and flipped y and z and motors are fine on y. Original geeetech melzi. buying a new board isn't in my budget right now so I'm hoping there's an easy fix.
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pmzielinski
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Mendel90
not sure how to do that on the melzi. There is volage at the trimmer pot for z.
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pmzielinski
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Printing
Good thought JamesK, but yep I checked that even replaced it just because. Still no Z
by
pmzielinski
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Printing
I ran a print last night on my i2 it printed fine. When I went to home the z axis before shutting everything down it wouldn't move. I've tried everything I can think of since and nothing I try works. I flipped the y and z to check the motors and they are all fine.
Melzi v1 with Marlin firmware
desprate
by
pmzielinski
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Printing
Depends on the laser cutter in question I've seen 0.25mm holes put in as long as they are through holes
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pmzielinski
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Reprappers
Here's my configuration.h:
#ifndef CONFIGURATION_H
#define CONFIGURATION_H
// This configurtion file contains the basic settings.
// Advanced settings can be found in Configuration_adv.h
// BASIC SETTINGS: select your board type, temperature sensor type, axis scaling, and endstop configuration
//User specified version info of this build to display in terminal window during startup.
//Impleme
by
pmzielinski
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Reprappers
after picking at it and back burnuring off and on over 2 years my Prusa i2 has made a couple of parts in PLA. Since its an obsolete design now I don't want to put any more money into it, but I am not currently heating the bed. Last time I tried I fried the mosfet on the melzi v1 board (644p) I did replace it with a better mosfet but I'm afraid to power the MK2a bed heat. I got the temps reading c
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pmzielinski
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Reprappers
from your configuration .h
//// Endstop Settings
//#define ENDSTOPPULLUPS 1 // Comment this out (using // at the start of the line) to disable the endstop pullup resistors
// The pullups are needed if you directly connect a mechanical endswitch between the signal and ground pins.
const bool ENDSTOPS_INVERTING = true; //set to true to invert the logic of the endstops
//If your axes are only movin
by
pmzielinski
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Reprappers
2 thoughts based on some of the stuff I've been through with my Melzi v1.
Did you set the reference voltage?
do you have an issue with an end stop such as bad switch, inverted logic etc?
by
pmzielinski
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General
0backbone0 you were right on the jumpers afterall there was a trace on x axis jumper that was fractured, and 2 on the y finall found them last night and they are fixed. movement is smooth and numbers are now similar to what seems to be the norm still tweaking a little but what an improvement. It looks like I will be back to working on heats maybe even this weekend.
thanks for the feed back
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pmzielinski
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Firmware - mainstream and related support
Hi
yes I checked microstepping is enabled. Sorry I'm just getting back to this family trouble. I'm wondering if it has anything to do with power supply voltage.
by
pmzielinski
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Firmware - mainstream and related support
Hi everyone,
my first post on my first project so definetly newbie on this.
Started building a Prusa i2 over a year ago but trying to keep it as cheap as possible so thats been part of my delays theoretically should be able to run now and have less that $100 in it.
Prusa i2 Wade Extruder
Melzi v1 board - I know its got issues
using a Dell laptop powersupply 19.5V 90w
geeetech heat bed
Loade
by
pmzielinski
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Firmware - mainstream and related support