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Rostock, Kossel, Simpson, 3DR, and more. See: http://reprap.org/wiki/Category:Delta. Previously named "Delta Robots and Stewart Platform"
Re: which firmware is popular for single motor dual extruders - 10 years ago
i'm also using a WRITE (servo0_power, HIGH) and a subsequent LOW. I create/define servo0_power as pin 5, which is next to the servo signal pin on EXT1 header on RAMBO. Kisslicer is back! and I'm handling drool by using M109 R170 at the beginning of the Tool change (Deselect script area). the nozzle sits on the last spot (usually infill) while cooling. The purge pillar primes the next nozzle. iby davew_tx - General
Re: How to disable servo movement between probing point ? - 10 years ago
if you mean, the servo has jitter, you can squelch the noise by putting a 220ohm resistor between the negative and signal line at the servo. That stops the jitters, which I found is caused by having the servo near the stepper motor. If I separate them by several inches, the jitters go away, but that is not a solution for me. You can also turn off the servo signal and try to park it, but if youby davew_tx - General
Re: FFC extruder / x carriage connectors idea (Flexible flat cables) - 10 years ago
check out Samtec ZF5S, in 30, 40 and 43 circuits. about $1.5 a connector, 2.5 amps per circuit. The cable is the cost, at around $4 per foot. Simple strain reliefs near each cable end keep forces off the connectors. The zero insertion force (ZIF) locking bar is tricky to get pushed in fully. This leaves the cable free to pull out, but if its pushed down all the way, there is a great grip. A pusby davew_tx - General
Re: Replicator - like reprap - 10 years ago
check out my first, overly built, ultimaker style printer, I called Mitus. It is built on a frame work of 80/20 and is beafy enough to be a cnc router, plasma etc. youtube Mitus Prints for a collection of videos chronicling the life and evolution. the first moves, showing the two moving bars, no head in that video. I found that having only 1 bearing on each bar, a 20mm VXB bar/bearing setuby davew_tx - General
Re: Uprint chip/dongle trading for cheap material reloads
- 10 years ago
from what we guess. different machines do not see the unfamiliar dongles as empty. they read them and log the serial number and the amount of use. the dongle stores the fact that it has been used a certain amount. we're guessing 10% over the 30 cubic inch. This is why you can use a dongle several cubic inches past the supply on the roll. I just use some scraps manually loaded. simple swapby davew_tx - General
Re: Thermal Putty for Thermistor/Thermocouple - 10 years ago
well, my PT100s are in the mail, and I just ran Marlin on RAMBO, with a pot resistor. The host returned temperatures as charted on the Omega chart, so I'm expecting similar results when they arrive. Also, i like the ohm correction I added, so tuning can be done at a few points in the chart, and the offset should be the same number. The typical Epcos 100k drops to a very similar range of resistaby davew_tx - General
Re: Thermal Putty for Thermistor/Thermocouple - 10 years ago
turns out that Marlin is amazing and can read the RTD using the onboard voltage divider setup with the 4.7k pullup resistor. Using a pot resistor, I measured a 12 ohm shift along all values, as reported by the host. This test measures the pot unhooked from the RAMBO, as it's affected by the pullup. This means the RTD characteristics/curvefit was shifted by this amount. I simply modified the mathby davew_tx - General
Re: POLL: Which nozzle size? - 10 years ago
.4 with 1.75 seems to offer good range of usageby davew_tx - General
Re: Thermal Putty for Thermistor/Thermocouple - 10 years ago
I'll create a new thread when I get the Omega RTD working as well. Should be a simple circuit that uses the Marlin lookup for PT1000, PT100 or that style. Our goal is to provide a voltage instead of a resistance, for the input of the voltage divider on the board. Should go straight through to the ADC, and be ranged as needed. This renders the hard to change pullup and Vref pretty much irrelevanby davew_tx - General
Re: Dual Extruder Pin Assignments - 10 years ago
Temp_1_pin was always assigned to 1, yet your display photo shows 0C. That is a clue. James advice was for the heater part. Look in Config.h, and define extruders as 2, and the sensors as a 1 for everything. (assuming you have Epcos 100k thermistors.) . . Might look into the firmware. // This defines the number of extruders #define EXTRUDERS 2 . . . #define TEMP_SENSOR_0 1 #define TEMP_SENby davew_tx - General
Re: Thermal Putty for Thermistor/Thermocouple - 10 years ago
Viktor, Using PT100 sensors causes some changes on the Vref, R2 and capacitor. OMEGA has cheap PT100 and PT1000 sensors, but the wiring change to my RAMBO keeps me from trying it. Did you just assign another pin and make a separate circuit off board? I've looked but can't find details and wonder how you solved this. Daveby davew_tx - General
Re: Any Micron E.M.E Extruders/Hotend Owner Reviews? - 10 years ago
I have to stop thinking that my machines are large.by davew_tx - General
Re: what are we really trying to acomplish with the cooling fan - 10 years ago
Last year, I used an iwata airbrush pump to put air where I needed it. on the cold end section right above the hotend. it was noisy, and didn't help eliminate jamming. I'll try to dig up a picture shortly, of the CAD image at least. I was thinking this would be a good way to bring cold air into a heated build chamber. not sure it's necessary to do this. I also tried a lumbar air pump from a Foby davew_tx - General
Re: A Promise is a Promise — Ultimaker - 10 years ago
translation of "immediate" hiding in a cave for 3 years waiting for your patent to be granted.by davew_tx - General
Re: Filament Knots on Spool - 10 years ago
I have this problem when I let the cut end of the filament free and it jumps back to the spool. It usually tucks under other wraps, and when i later grab the end to feed into the extruder, that knot like you've shown is the result. I've had long prints start off good, with me specifically looking at the spool for this issue. It then shows up later. I think it is a single overlap that is hard toby davew_tx - General
Re: Big printer, any ideas for heat bed? - 10 years ago
large parts suffer a bit without the enclosure for the printer. Sure, your surface will be hot with a heated bed, but i'd guess that from 1" and up, the heat from the bed stops providing benefit at the print surface. Internal stresses build, and you can get part fracture, de-lamination, warping etc. It is so dependent on many variables, and some have had success proving this opinion wrong. I'vby davew_tx - General
Re: Need help building perhaps the biggest repstrap printer ever made! - 10 years ago
First, welcome to the club and get ready to be consumed for a while. There is no free lunch here, whether you're buying a machine and learning how to print, or designing and building from scratch, then programming the firmware, then learning to print. Your first chunk of time should be spent reading, researching, reading, and researching. +1 vote to buying a small kit. you would benefit greatlyby davew_tx - General
Re: which firmware is popular for single motor dual extruders - 10 years ago
Update: Putting a servo near a stepper causes the servo to jitter. The field strength of a running stepper induces current in the servo signal wire (orange), which is nearby. Maybe induces currents on the servo PCB, not sure. This is even if I attach, write, then detach the orange signal wire of the servo from the RAMBO, due to the +\- still powering it. I thought of two ways to solve it, onby davew_tx - General
Re: which firmware is popular for single motor dual extruders - 11 years ago
it seems the servo idea will work well except for the fact that it jitters when in a position. I've noticed that while moving cartesian steppers around, the servo jitters, which is undesirable and can cause heating in it. I then decided to wake it up, move it, and shut it off. I'm using this attach, write and detach section. The delay helps it have time to move. in Marlin Main still. elseby davew_tx - General
Re: Servos to Rambo 1.2 d - 11 years ago
just put the orange signal wire from the servo on pin 6 of the EXT1 header. Pin 1 is +5V Pin 2 is ground. in the pins.h file, you need to define the pin, under the 301 motherboard section. #define SERVO0_PIN 4 // RAMBO ext1 pin 6, verified to work this is 1x6 straight pin header, right above the Mega processor, when looking at the board with green connectors at the top. Pin 1 is the left pin, wiby davew_tx - Controllers
Re: which firmware is popular for single motor dual extruders - 11 years ago
On the Douglas3D design, their servo is not for extruder switching, but latching it firmly into position for either extruder. Their retraction command was causing premature shifting over, so they servo latch it until the retraction has been performed. So, I grabbed the latest Marlin and this is my solution, for both the servo extruder changing and the stepper motor reversing. I'm no programmeby davew_tx - General
Re: which firmware is popular for single motor dual extruders - 11 years ago
I guess I'm picturing a string of commands at each tool change, like a prefix or postfix code block that everyone uses. I think both Kisslicer and Simplify3D let you do that. so there could be a park G1 move, maybe over a trash can or off part a bit. Then a retract on the outgoing extruder. Then a servo command to change extruders. Somehow, know the stepper is reversed at this point. a special Mby davew_tx - General
which firmware is popular for single motor dual extruders - 11 years ago
I've been looking for a firmware that allows dual extruders with a single stepper. Of the two ways a single motor could work (same rotation versus reversed rotation) , I more curious about how reversing the stepper is accomplished. Anyone know where it's located on Github or how it's done?? Daveby davew_tx - General
Re: 3D Printer World Expo 2014 Burbank, California - 11 years ago
I guess embedding imgur albums is not good anymore?by davew_tx - General
Re: 3D Printer World Expo 2014 Burbank, California - 11 years ago
we work for a company that does enterprise class computer enclosures, like storage and servers etc. we've been piddling with 3D printer designs for almost one year. The show was interesting and somewhat busy with people. I did like the Airwolf a lot. Running high quality parts. had some great batmobile cars and a cool statue Johann was very nice and about 6'7", which I didn't expect. Nice Koby davew_tx - General
Re: 3D Printer World Expo 2014 Burbank, California - 11 years ago
my company is sending 3 people.by davew_tx - General
Re: Starting a Business in the 3D printing Industry. - 11 years ago
My pragmatic $0.02: Stay in school, become talented in your craft, work for a company and make yourself indispensable through over performance, earn money, have a family and commit to it, enjoy your time on earth. You owning a business = a business owning youby davew_tx - General
Re: Advice: Avoid this brass for your hobbed drive wheel - 11 years ago
my poor choice of words. I was meaning that I'll have 18 holes around the circumference. I would expect a single plunge or as you mention, 2 or 3.by davew_tx - General
Re: Advice: Avoid this brass for your hobbed drive wheel - 11 years ago
I think the chewed up bits are something to be avoided. I don't know if you ever saw one of those Bits for Bytes heads working. They had a bolt spinning and pressed the filament into bolts thread, nearly running parallel to each other. The one I saw looked liked it was heavily dusted with a fine powder, since the bolt thread was basically grinding into the filament to feed it. I bet the oil soby davew_tx - General
Re: Advice: Avoid this brass for your hobbed drive wheel - 11 years ago
it's funny. I have made several of these, using a scrap piece of brass I had laying around. Those had sharp teeth and have no issues. Might be a better grade or alloy of brass/bronze. The hobbing could be done less deep, and should create less sharps. I'm also thinking of using an endmill to cross cut a wheel. Not extremely sharp if I keep the number of teeth low. Credit due: that peck dby davew_tx - General