Hi, my new CoreXY build has two NEMA 23 motors running X and Y and even a NEMA 34 motor (since I had it laying around) on the Z axle. I have used external drivers and breakout boards on my RAMPS 1.4. Everything is on 24V with a better regulator soldered onto the Arduino Mega. So far, so good. I set the extruder driver, an A4988 on the RAMPS, to 1A. This works great, no clicking, good feed, me haby HugoW - General
Hi, I have my diy printer working and today I made my first 4-hour print. It all worked, I am happy. But on weekdays, making a 4 hour print would mean the printer sits idle for about 5 hours until I return from work. I would like to make something that switches the machine off when it's done. Maybe I am reinventing the wheel, and I have no real clue of the workings of Marlin, but here's my idea:by HugoW - Firmware - Marlin
Hmmmm, OK, thanks for the input. So there is no setting in Cura to cure this. I'll make a table of hole-sizes required in the CAD file for the desired holes and work with that. I could with smaller sizes run a drill through, but on this 12mm hole drilling out 0.5mm is drilling out half the inner layer, I don't like that. Cheers, Hugoby HugoW - Printing
Hi, I am new to 3D printing, my DIY CoreXY machine is funcional since last weekend. I did make a fairly decent 3DBenchy already so I am happy, but there is an issue I need help with. I printed some rings yesterday, 20mm external diameter, 12mm internal diameter, 10mm high. The products are nice and round, external diameters are fairly good, varying between 19.9 and 20.0mm. The height is OK, too.by HugoW - Printing
If not I'll rename this one and start it, but I think I am probably not the first to think of this... I am very good at looking for things, finding them usually proves a lot harder! Cheers, Hugoby HugoW - General
To get back to the innitial question; during operation the belt, one piece or two, will operate as two independent loops. But during tensioning that is not mandatory. You could make a system with one long belt, both ends and the middle of the belt running through the extruder carriage. Tension the lot without the middle of the belt clamped to the carriage, and clamp after you tensioned. This wayby HugoW - CoreXY Machines
It works and yes, I am pretty exited about that! And yes, I am aware the result sucks, but anyway... First attempt, too much opening between bed and nozzle: Second attempt, I call it a success! Part 1: Part 2: The print is not entirely done. Half way the second top layer it pulled loose from the bed and I retrieved it manually. I was going to shoot the third and final clip just when it hapby HugoW - CoreXY Machines
@0_lampe; yes, the belts are almost perfectly alligned. I still need to fit some shims under some pulleys but everything is set within 0,5mm. @cozmicray; they are all stepper motors, NEMA 23 for X and Y and 34 for the Z. 17 for the extruder. The extruder is an MK8 from which I cut off the base and put my own base / bearing block in place. The servo is for mounting a retractable Z-axis homing swiby HugoW - CoreXY Machines
I have, back in the '90s, made a fairly analogue system on my homebrew CNC wood mill that worked on a multiturn potentiometer. As the (stepper) motor spindle turned, so did the potentiometer spindle. 10mm / turn, 100 turns end to end, 1M potentiometer, 12V system. So, each mm gave 0.012V drop or raise, depending on the direction. Absolute, no homing required. But I never found a potentiometer accby HugoW - CoreXY Machines
It's a basic RAMPS 1.4 with three TB6560 drivers via extension boards for the axles. The extruder runs on a normal 4988 driver on the RAMPS. Hugoby HugoW - CoreXY Machines
Hi all, herewith I start my thread on my first 3D printer. I have little knowledge on the subject, what I know I learned on this forum and by googling. I started this project in my head end of last year (2016) and did the first purchases mid-February I think. I don’t really have a budget (not as in undefined, but as in non-existent), and I am very happy with the two second hand NEMA 23 motors anby HugoW - CoreXY Machines
If it sounds too good to be true it probably is; just found a piece on the Arduino forum the Marlin would require a major rewrite and the RAMPS would need some voltage mods to make it all work. No plug and play at all, hardly 'compatible'. Bummer.... Hugoby HugoW - RAMPS Electronics
Hi, I am setting up Marlin on my RAMPS 1.4 set-up and I try to read a lot about it. I have off board upgraded drivers (NEMA 23 motors) which can handle a lot smaller microsteps than 1/16th. Also I am looking into adding presicion with 0.9 degree stepper motors and I would like to speed things up once I have it printing decently. All this will ask a lot of the processing speed of the Arduino Megaby HugoW - RAMPS Electronics
Thanks. The bed is an 8 mm. slab of tooling plate, the switch sees it and the LED on the switch reacts. Whether I set the logic to true or false, it doesn't work. I tried both. In the meantime I think I might have fried the sensor. It only gives very low sens voltages, now. Maybe I used resistors too low in resistance to split the voltage, I used 1K and 220 ohm. The voltage split was nice, butby HugoW - Firmware - Marlin
Hi, I just replaced my microswitch Z-min switch (which was just on there for testing and it works) with a "SN04-N 4mm Inductive Proximity Sensor Detection Switch NPN NO DC 10-30V" from ebay. I wired the power to 24V, put in two resistors to split the signal voltage, I have 4.7V unactivated and 0.2V when activated. So I think that part should work. Next I commented out "#define ENDSTOPPULLUPS" aby HugoW - Firmware - Marlin
Hi, I tightened the locknut of my heat break against the housing of my MK8 extruder, and the heat break was torn in two. I used a small spanner and I don't think I used excessive force (and I am no Hulk, I am a nerd). Any tips and tricks on how to avoid this, other than: "Be careful!"? I already tried the 'turn until it breaks and then back off half a turn. No luck. Cheers, Hugoby HugoW - General
Maybe something like this could help: Keeps most of your current system in tact but introduces the required safety / brake to avoid the bed dropping. Keep posting, I will need to so something similar, soon... Cheers, Hugoby HugoW - CoreXY Machines
Hmmmm, now you're making too mucht sense... That might be a solution, although I wonder why I wouldn't be able to run my hotend at 256 PWM (half power) which should be the same, power-wise. But I'll give it a shot, for the price it doesn't hurt to try. Cheers, Hugoby HugoW - General
I tried a bit more but above 1/4 power, PWM 64, it runs out of control, overheats to the point the autotune gives up. Is this normal? I read about other people running a full set-up on 24V, do they all tune back the hotend PWM? Besides that, running at PWM 32 (very low power) gives +/- 2 degree fluctuation, 64 gives a +/- 5 degree variation. Is +/- 5 degrees acceptable? I think it is a bit muchby HugoW - General
OK, good tip. Didn't work at 50%, but made me get closer. I finally lowered the value from 255 (full blast) to 32 (1/8th blast...) and now autotune is running. I just got new settings and I will try them I will gradually up the pwm again and let autotune run again and again. Cheers, Hugoby HugoW - General
Hi, tonight I am trying to finalise my hotend settings and melt the first PLA. I heated the nozzle to 200C and overshot by about 70 degrees. Not good. I have a cheap Mk8 extruder from Ali Express which is made for 12V and I run it on 24V, so there is probably the issue; wrong p, i and d settings. So I tried Marlin's pid autotune: m303s200c10 and GO! It quite quickly shot to 270 degrees C and auby HugoW - General
I also found a driver for the motor in my shed, and I have a 24V 25A power supply so that should suffice. I found the 2mm pitch threads on aliexpress, I feel I need something to avoid the bed from dropping down when not powered (and reduce the need for putting power in to hold it up), like our dear dentist has got the worm reductor. I found a loop 1140 GT2 belt 10mm wide, some 40T pulleys to getby HugoW - CoreXY Machines
The plate is definately alloy, 4.4 x 4.4 x 0.1 dm makes 1.936 litre, aluminium weighs 2.7kg/l, so the plate is 5.2kg. Bit of overkill mounting plates, bearings, etc, makes 6.2. I could save half a kg on the mounting I guess. But I have a cunning plan... I found my HN200 3438 motor make a huge amount of torque. See the catalogue page 19/36: click 480 Nm holding torque, 13Nm Detent torque (still nby HugoW - CoreXY Machines
@lars.arvidson; thanks. Your system is about 9.6 times more powerfull than mine, not looking at the difference in friction in the set-ups. Wow. @dc42; thanks, I put in 4,5kg (per motor, including some printed material), I get 9N.cm. I guess that will be the required 'detent torque' of 1.6, as my holding torque is higher than that and it doesn't work right now. If I change lead screws to 1.5mm piby HugoW - CoreXY Machines
Thanks for the input. I have NEMA 23 motors on the X and Y axis with external drivers (as in not on the RAMPS), everything is on 24V. I just thought the Z axis doesn't require that much speed and I didn't consider that bed weight. I haven't spent a lot yet, most bits and bobs are second hand or dumpster dive finds. Like this plate, it was slightly larger when I got it, but too small for the purpoby HugoW - CoreXY Machines
A little digging learns my motors have a holding torque of 28N.cm and a Detent torque of 1.6N.cm. Not really sure what that last number means. What weight would two of those be able to lift, with an 8mm pitch as the current threads have, or a 1,5mm thread if I switch to M8 (basicaly reducing the load by over 80%)? I also wonder how far I can / should push the A4988 driver, it is set at 0,7V referby HugoW - CoreXY Machines
Hi, I have a basic RAMPS 1.4 setup with an A4988 driving the Z axis. I have two of these but with slightly smaller motors: Now I was given a nice piece of tooling plate to make the bed of my printer, 440x440x10mm. But with it's mounting stuff on it weighs a ton (about 8kg?) and the motors can hold it, lower it, but no way they can raise it. What are my options? I am considering to cut off theby HugoW - CoreXY Machines
Finally issue found, a bad driver. I replaced it with a similar one and now it all works. Cheers, Hugoby HugoW - CoreXY Machines
Finally issue found, one bad driver. I replaced it with a similar one and now it all works. Cheers, Hugoby HugoW - Firmware - Marlin
Issue found. Bad big driver. I replaced it with a similar one and now it all works, wired conform the diagram. Cheers, Hugoby HugoW - RAMPS Electronics