My blown mosfet showed ZERO signs of failure and yet it was stuck in the on position meaning an internal short somehow. Swapping it out with a known good mosfet allowed the Ramps nozzle heater to work properly again further proving that the mosfet had blown.by umdpru - General
Quotetjb1 I'm pretty sure MINTEMP is just a thermistor initialization check and can not be used during printing because the printer would never start if this is within 5 degrees of extrusion temp. I think the feature you are thinking of is the min extrusion temp which just prevents extrusion and would not shut the printer off. You are right and I realized it. I admit my mistakes - most of themby umdpru - Safety & Best Practices
You could also power the board and check the temperature of the Mega chip with power applied. More often than not, when their blown, they get REALLY hot and just don't work. I fried an atmega 644 on some gen 3 electronics by accidentally putting 12V to the step/direction pin header. The chip got screaming hot and wouldn't work. I agree that you are much more likely to have fried your Atmega boarby umdpru - General
QuoteJust want to say that with 600W you will NOT need an external unit. You could run a 4x4 grid of beds and still be okay. That's not very clear. If he's using a 600W computer PSU then the 12V rail won't be able to supply adequate current to the nozzle and both beds. Additionally, the Ramps board will probably (not for sure, though) go up in smoke if you power two beds and a nozzle from it. Hby umdpru - General
Those mosfets are rated for higher than 50A. The only way to blow them is if something shorted. I had an issue with one Ramps board where I accidentally wired a MK5 Plastruder hot end resistors into a short instead of parallel wiring. When power was applied, the trace fro mthe mosfet to the screw terminal smoked up and blew like a fuse. I soldered in some wiring and found that the nozzle heater wby umdpru - General
QuoteCraigRK Quotebobc Stupid question, but if mintemp is set to 210, how does the heater ever turn on? Not so stupid. It is the one thing that I have been wondering about. A number of people have been talking about this, but none of them seem to really know how this feature works in the firmware. On my machine this is set to 5C and it means that in winter I can't get my printer (which livesby umdpru - Safety & Best Practices
Hi all, I spent a lot of time last night, unsuccessfully, trying to install a ramps board (the second one I own) onto a computer with no success. My first one installed on the same machine just fine so I was frustrated. The new ramps shows up in hardware manager as a "rumba atmega 2560 co". The first ramps, and all my other mega 2560s all show up properly as "arduino mega 2560". I have triedby umdpru - General
The overtemp limiters on the chips are for the chips, they aren't there to prevent motor wiring shorts causing fires. I think I will be adding inline fuses to the 11A and 5A lines as a start. Edited due to bad information, sorry.by umdpru - Safety & Best Practices
Edited to bad information. Sorry.by umdpru - Safety & Best Practices
John, what files should we be printing out for the top? There is a top mount file in the "simple parts" folder but then there is the whole top folder.by umdpru - Delta Machines
JohnSL, My need for files is no longer. I was having issues with some of the bosch profile pieces staying stuck down initially. I have since upgraded the Cupcake CNC I am using to a stepper extruder and I have successfully printed 5/6 corner (top and bottom) frame pieces. I have the bosch rails on order and I am looking at purchasing the rest of the major mechanical pieces. I do have a few quby umdpru - Delta Machines
No problem, let me know how you make out. I just now started printing out an extruder block as a backup! Always have extruder parts backups. I don't have the luxury of another local printer until I get my MakerFarm Prusa I3 in. I read on the forums, I can't find where now, that the Gen3+ board was for an even earlier version Gen3 motherboard that had the stepper drivers integrated directly ontoby umdpru - General
The gen 3+ board I'd only compatible with the old gen3 motherboard with integrated stepper drivers, from what I found out. Do you have that one or the the MakerBot red electronics? I believe you really need a 3g5d shield which I have been unable to find. Also is your dc motor really dead? Have you applied 12v directly to it. Mine"died" too until I realized that it wasn't dead it was just that theby umdpru - General
I have two of those 12V 30 amp supplies and they rock. My Cupcake had a 480W ATX PSU in it and when the heated bed and nozzle kicked on, the voltage would droop to under 11.5VDC. The 12V rail could only supply something like 11A which was entirely inadequate. The voltage doesn't sag at all now. I got mine on Amazon using Prime.by umdpru - General
First, there is no Greg's Hinged Extruder that will fit the stock cupcake/TOM dino's. I had to custom drill some holes to bolt things together. I didn't really feel like using Solidworks to remix an extruder to fit. Second, I am switching from a MK5 plastruder hot-end to a J-Head. With that said, I used the following parts: Extruder Body from this Thing: I am using the gears from that thing aby umdpru - General
I did not get far enough to get it working. I accidentally applied 12v to the motherboard on a stepper direction line and fried it. I ended up going to a ramps 1.4 board along with a greg's hinged steeper extruder and couldn't be happier. My cupcake is printing like a champ! I am going to replace the atmega 644 and get the gen3 board going again. I'll turn it into a hand held plastic welding gunby umdpru - General
John, Any chance you can post your files to Github as IGES or Step files? I have SW2010 and can't open your 2011 versions. I am having some issues printing and would like to modify your files slightly. Working with STL's in SW is a PIA and takes a LOT of time. I'd rather not remodel them from scratch. I'll post my modifications afterwards if you wish.by umdpru - Delta Machines
Thanks, All. I have bought some pololu 4988 stepper drivers with carrier to use. Hopefully they arrive quickly!by umdpru - General
Thanks for the pointers, guys. I've found various schematics around these forums detailing how to hook up the existing extruder to use the h-Bridges to drive an extruder. It requires alternate firmware. I am still doing a ton of reading and research on the subject. I was hesitant to even start the thread as I KNOW the information is out there to be had. Do you have any other pointers for me? Scby umdpru - General
I have borrowed a long neglected Cupcake CNC #1682. I'm trying to go through the machine and upgrade everything. My first priority is to get a stepper extruder on it, however, I have the 3 gen electronics. I realize my only options are the 3G5d shield route or an ugly cable hack. Since I can't find any 3G 5d shields for sale, I have decided to go the ugly cable hack route, unless anyone has a 3G5by umdpru - General
Thanks, Dust. This is a borrowed printer so I'm loathe to begin replacing and upgrading too much. I will definitely be using upgraded electronics on my printer when I get/build it. For now, I am buying the stepper IC from digikey along with some spares and also a few more 7805 regulators. Thanks for the recommendation on the pololu's. I will begin reading up on the alternatives.by umdpru - Controllers
Hi all. I'm new to 3D printing. I recently got my hands on a Makerbot Cupcake CNC with Gen 3 electronics on it. The person I got it from (on long term loan) also gave me a set of acme lead screws to install to rid the machine of it's Z-axis wobbling. Anyways, I installed the lead screws and experienced some binding. I am feeling a bit embarrassed at the moment because I should have known better bby umdpru - Controllers