I don't quite understand what you mean when you say you've remapped D9 to pin 44. The mapping of a name like D9 to a physical pin is fixed in hardware. If you do want to map a function to a different pin, you would change the value for that function. e.g. in pins.h #define HEATER_0_PIN 13by frankvdh - Laser Cutter Working Group
Is a 7805 going to be fast enough? I'd just take the 5V signal from the input to the MOSFET on the RAMPS.by frankvdh - Laser Cutter Working Group
So this is a problem with the hot-end, not the heated bed. And not thermal runway, per se. OK. Whilst many people have more experience, so I could be wrong, I've never seen a case where G-code directly causes loss of temperature control. There are various indirect ways it could happen, some of which I've tried to cover earlier. I'm kindof surprised that making walls thinner quadruples the printby frankvdh - General
Budget $1,000. If you spend less on the printer, you will pay for it in time and frustration. Having said that, the cheapest way would be to buy a Chinese 3D printer from eBay or AliExpress. Or, better yet, look for a secondhand printer on eBay. Don't be seduced by a large-scale 3D printer. The larger it is, the harder it is to get level. Printing costs and time approximately go up with the cubby frankvdh - General
Check for overheating of either the stepper or the driver. You should be able to hold your finger on both the motor and the driver heatsink.by frankvdh - General
QuoteLFG I am running 3 different printers that are home built I3 clones running Ramps 1.4s with Marin 1.1.7 firmware. I am having thermal runaway errors at exactly the same spot across different printers. I was using an older g-code slice with Cura 3.5 that I've printed 12 to 20 times but the last 7 tries have failed. I have re-sliced the g-code with Cura 3.6 a few times and although it has woby frankvdh - General
The +12 & GND on the laser are connected to the power supply. It looks like this software is for a CNC machine with a motor-driven spindle. I guess you could use the motor on/off signal to turn your laser on/off, in which case you would connect the laser ttl+ to D10 and the the ttl1 to GND. What wattage laser did you buy? Please post back how well it works.by frankvdh - Laser Cutter Working Group
I wouldn't expect that the thermistor contacting the heat bed would cause a short bad enough to cause smoke, except that you might get bad temperature readings from the bed, which might cause your controller to overheat the bed eventually. Even if some other wire was contacting the bed, the thermistor wires are so fine that even if they did burn out, you probably wouldn't even notice the smoke.by frankvdh - General
It sounds like the heater is disconnecting... your errors are low rather than high temperatures. If it was the thermistor disconnecting, I'd expect the temperature reading to go to 0 or some very high number. So I'd look for a loose connection or perhaps nearly-broken heater wire, perhaps inside the insulation. In particular, I'd be looking at places where the heater wires flex. NB that this isby frankvdh - Printing
I'm not an electronics expert, so hopefully someone knowledgable will jump in to confirm/deny my thoughts. I don't think that a 7805 power regulator would switch fast enough to handle the PWM of the fan speed. I think if you put a diode and resistor between the 12V out from the fan and 5V on the TTL supply, you could clamp the signal level to 0-5V. But you should be able to get 0-3.3V by takby frankvdh - Laser Cutter Working Group
19kW! I guess I'd have to upgrade to a 24V supply then.by frankvdh - General
QuoteVDX So - if not patented by the inventor but disclosed openly -- any other applicant could file his own patent on the same invention within a year Probably they wouldn't get the patent; if the patent office did some research and found the prior art (i.e. the real inventor's disclosure), they wouldn't award the patent. Even if the patent was awarded, the holder still has to defend it. Theyby frankvdh - General
I don't know the details of US patent law, but the principal is that a patent can only be given on a *new* invention. If it's not new, it can't be patented. If there is prior art, then it can't be patented. Otherwise I could search for a patent for e.g. the wheel, and if there wasn't actually a patent, I could patent it. And then try to force all the automobile makers to pay me a royalty.by frankvdh - General
Patents are legal mechanisms to allow you to profit from your inventions, by preventing others from using them. If you don't want to do that, then don't use a patent. To force a technology to be public domain, all you have to do is to be able to prove you invented the technology first. However, patents (and preventing people from patenting your invention) are only as strong as your ability to liby frankvdh - General
I also have some screws for the belt to go round, after the printed cylinders broke. I just use a zip tie to clamp the end of the belt back to the belt.by frankvdh - General
Quotejefbed but you would need to get a silicone heating pad powered by mains voltage and mount it below an aluminium plate, and clip glass above that. Out of curiosity, why do you need the aluminium plate? Why not mount the heating pad directly to the glass? Would you expect the glass to deform significantly under its own weight?by frankvdh - General
There seems to be some assumption that rod-ends don't have any play, which is completely contrary to my experience. One of the reasons I went to mag-ball was the play in the rod-ends.by frankvdh - Delta Machines
I agree with dc42. A 500mm printer needs to be twice as accurate in level as a 250mm printer. Printing time would be in the region of days rather than hours. You would probably need a large diameter nozzle to compensate for the inaccuracy of the mechanism. That would also reduce printing time a bit, but limit your ability to do fine detail. And printer cost will be more like exponential than linby frankvdh - General
Check that the motor and stepstick aren't overheating. Some more questions (apologies if these are a bit basic): It *is* skipping, right? The extruder motor making a clack-clack-clack sound, not a buzz or hum. Does it start skipping immediately, or does it work OK for a while before skipping? Anything time-related is probably originally heat-related. Can you remove the hotend so it just extby frankvdh - Printing
I've done a bit more thinking about magnetic joints (as well as backing the Zatsit ) and thought I'd share my methods and conclusions. Firstly, I searched around the Net for a magnetic field analysis program, and used QuickField Student, because it's free, gave me the analysis I wanted, and I was able to figure out how to drive it. I modelled a 90-degree countersunk magnet with a 10mm steel balby frankvdh - Delta Machines
Right. You want the nozzle as far into the heater block as possible, to get maximum thermal transfer to the nozzle. You want the heat break hard against the nozzle, to prevent leakage. Within those parameters, you want as little of the heat break inside the heater block as possible, to minimise thermal transfer. So here's the procedure: Get the heater block up to temperature (otherwise piecesby frankvdh - Reprappers
Disassemble and re-assemble correctly. Worked for me (after months of pain).by frankvdh - General
My feeling is that springs would be better than loose belts but worse than tight belts. Compared to tight belts, they would increase backlash, not decrease it. Think of the spring as mechanism for the belt to stretch and shrink, depending on acceleration of the carriage. Worst case, the motor is attempting to move the carriage to and fro over a short distance and the spring absorbs all the energyby frankvdh - Mechanics
Dang! Missed the Super Early Bird.by frankvdh - Delta Machines
I have an expensive name-brand printer which uses essentially a wirebrush as a wiper.by frankvdh - Reprappers
Given the current furore about plastic bags and oceans and non-biodegradability, I'm wondering if there's been any work on shopping bags made out of PLA, and, if not, why not? Although PLA won't degrade much in the ocean, it can at least be broken down in a composter. Or even re-used as *free* source material for 3D-printing. Although 3D-printing wouldn't be economic for large-scale production,by frankvdh - green talk
Broken link ???by frankvdh - Delta Machines