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Re: max step rate - 9 years ago

But wouldn't that then mean I have the same old problem of the Drv8825 not being able to provide anywhere near the amps required? Or can the Drv8825 automatically adjust the volts to power two steppers on one channel? I know best solution is to replace the steppers with some decent 1.2A model but the old piggy bank is empty. Many thanks, Andrew

by friarfish - RAMPS Electronics

Re: max step rate - 9 years ago

Hi folks, thanks for the replies. The actual printer is a rework tweaked with a 12864 lcd. The current steps/mm is 4000 but I might increase it to 1/16 8000. The steppers are still very noisy. I seem to have problems especially in the z once I start playing with 4mm/s+. But I have another problem that has reappeared. It seems that once I start having xy moving above 120mm/s, actually figure is r

by friarfish - RAMPS Electronics

x endstop works when autohome but not manual move - 9 years ago

Hi folks, with the help from Olaf, I bumped off most probs but this one has appeared again. I have three makerbot clone endstops x min, y min, and z max, the red ones from eBay. If I movethe extruder away, when turned off, and then issue a autohome through the 12864 lcd everything works. If I manually issue a move that sends the extruder into the x min endstop, it doesn't stop. If I manually tri

by friarfish - Firmware - mainstream and related support

Re: EXTRUDER_0_AUTO_FAN_PIN function guidance - 9 years ago

Cool. I'll give it a try tomorrow. I guess if you hear a loud bang, well. :-( Thanks Olaf. Andrew

by friarfish - Firmware - mainstream and related support

Re: Modded marlin to use E1 as second Z driver??? - 9 years ago

Hi Dust, figured that one out. All the guides online said keep away from the config_adv.h, which I did. If I had ignored that advice, I would have found the solution. Many thanks, Andrew

by friarfish - Firmware - mainstream and related support

EXTRUDER_0_AUTO_FAN_PIN function guidance - 9 years ago

Hi all, after being introduced to the joys of config_adv.h i might have found what I want. My setup on a ramps 1.4 is pretty stock with the hotend wired to screw down D10 and the heated bed to D8. My extruder cooling fan is to be wired to screw down D9. If i enable in my config_adv.h #define EXTRUDER_0_AUTO_FAN_PIN xx #define EXTRUDER_AUTO_FAN_TEMPERATURE 50 #define EXTRUDER_AUTO_FAN_SPEED

by friarfish - Firmware - mainstream and related support

Re: Modded marlin to use E1 as second Z driver??? - 9 years ago

Hi Bruce, just slowed the Z back down to 2mm/s at 1/8step but haven't checked it out yet. I've pretty much maxed out the drv8825. I,as I have said elsewhere, stupidly brought 2.4A/coil steppers. I think you can see what two of those can do to a drv8825. At least, as you have shown, it can be done with a ramps 1.3. Suggests maybe I can do it with a ramps 1.4. Many thanks, Andrew

by friarfish - Firmware - mainstream and related support

Re: cacked steppers? Z axis working erratically - 9 years ago

Hi folks, I hope it isn't a wiring problem. Nightmare locating intermittent wiring issues. Olaf, not sure about the x belt binding the carriage on the z shaft. When I built the beast I replaced the x axis carriage parts with a design where the tension of the belt is braced against x axis shaft ends. I think it was mean't to address the very problem you raise. I don't know how good at this the

by friarfish - RAMPS Electronics

Re: max step rate - 9 years ago

Hi Olaf, yes, it is a page from the wiki on reprap. I keep losing it and refinding it. If the figure of 16KHz for max steps per second for a ramps/arduino r3 is correct then it is a handing fact to know. It also helps explain why running a 0.9/ 1/32 stepper at 10mm/s just don't work and gives me a reality check. Thanks for the info on internals Olaf, Andrew

by friarfish - RAMPS Electronics

Modded marlin to use E1 as second Z driver??? - 9 years ago

Hi folks, Does anyone know if any experiments have been using extruder E1 as a second driver for the Z axis? I wondering as, I'll admit it, messed when I bought my steppers and stupidly got 2.4A per coil models. Even running my Drv8825 at 1.8A I suspect the z steppers just aren't getting enough juice. Very flaky, going out of sync, freezing. I've tested at full step to 1/8 with max z velocity o

by friarfish - Firmware - mainstream and related support

max step rate - 9 years ago

Hi again all, Just seeking clarification regards the max step output on a ramps. I was just reading the wiki on step rates and it mentions the arduino ramps combo has a max step rate of 16KHz. Is that per output to each stepper or is that the total step rate of all steppers? This might be an obvious question but I haven't been able to locate this answer else where. Many thanks, Andrew

by friarfish - RAMPS Electronics

cacked steppers? Z axis working erratically - 9 years ago

Hi folks, the printer, a rework using a ramps 1.4, is assembled and I'm at the fine tuning the steppers stage. My steppers are 0.9^/2.4a per coil and they are being driven by DRV8825. I however are having problems with the z axis. I have run the DRV8825 in full step, 1/4 and 1/32. I have varied the DRV8825 to output between 1A to 1.8A. Multiple problems tend to occur. The most common when homi

by friarfish - RAMPS Electronics

how are thermistor tables created - 9 years ago

Hi all again, can someone explain to me how the thermistor tables are generated? I unfortunately have fitted thermistors, epoc B57560G104F, which appear to not be supported. I'm thinking of just entering the tables by hand but after looking at thermistortables.h I can't see how it relates to the corresponding temperature in the spec sheet. I know the obvious solution is to replace the thermisto

by friarfish - Firmware - mainstream and related support

Re: marlin compile error. too many initializers - 9 years ago

Hi enif, thanks for the info. about an hour after I posted this I realised myself I had set extruders to 0. I was just about to delete this post. I blame too many hours banging my head against the printer. Andrew

by friarfish - Firmware - mainstream and related support

marlin compile error. too many initializers - 9 years ago

Hi folks, just starting compiling marlin for the first time when I'm getting these rather esoteric errors. I've googled them and was only able get some answers on C/C++ sites that were rather "difficult" to understand. All help appreciated. Marlin_main.cpp:217: error: too many initializers for 'int [0]' }; ^ Marlin_main.cpp:226: error: too many initializers for 'float [0]' }; ^ Marlin_main.c

by friarfish - Firmware - mainstream and related support

amperage to hotend - 10 years ago

Hi folks, I know this has probably been answered elsewhere buy I have been unable to locate. What is the typical amps that are needed to run a hotend at ABS temps? Just curious because I want to tweak mine when it is finished and the amps needed obviously affect what grade components I have to buy. manu thanks, Andrew

by friarfish - Controllers

Re: no prusa frame dxf files working. please help - 10 years ago

Hi Vegasloki, figured out quickly just doing a SAVE AS caused problems. So I was just going to the github page and chosing the RAW format. I have no idea how but it appears the files have decided to start working. I'm just wondering if every single other time I was DL'ing them they were getting corrupted. Spot on about wanting to get the dimensions for the mounting holes. I was thinking of get

by friarfish - General Mendel Topics

Re: no prusa frame dxf files working. please help - 10 years ago

Hi John, Tried Inkscape and no joy. Also DL'd DWG Trueview, no joy. Tried on another laptop and was able get the sc10uu file to display but a dirty great triangle went across the middle. Grabbed the files from Josefs github and the einstein github twice and they still wont display on either machines. Can someone post their dxf's in an attached zip? I'm stumped to what is going one. Andrew

by friarfish - General Mendel Topics

no prusa frame dxf files working. please help - 10 years ago

Hi folks, new to the game and questions already. Obviously eyeing off the prusa i3, probably einstein variant, so I dl'd all the different frame dxfs to price etc. The files I have are, Prusa3_SC10UU-v1.dxf Prusa3ALU-FREZOVANY-v4.dxf Prusa3WOOD-v4.dxf Annoying none of them open to view. I have tried AutoDWG, AutoCAD 360 and Solidwork 2015 and none of them open or display anything on the screen

by friarfish - General Mendel Topics