is the effect the same when the layer height is 1/2 or 2x?by jamesdanielv - General
is the latest print spiral? if it has improved quality then there may be backlash in gear reduction. spiral prints in one direction for motors at a time, there should be a little part on each layer that has a bulge, this would be from where the motors switch direction.by jamesdanielv - General
to me that tower looks over extruded, or there may be backlash. have you removed all slop from x/y gantry? (and can you try it without gear reduction added to motors)by jamesdanielv - General
the issue: something is causing the feedstock to appear change color. what can cause color change? particles, or a break down in feedstock thru temp, or an uneven deposited layer, or possibly something else. is your print head clean? does printing part at a lower temp change effect? does printing part slower change banding effect? are the layers all the same height? can you print part ouby jamesdanielv - General
also limits in how fast the motors steps, vs how much power can be reached can be an issue. there may be issues in how the inductance vs resistance effects the motor at the steps speed you are after. there is only so much current that can overcome the resistance of a charged coil. more voltage allows motor to step faster because as step rate increases so does the coil resistance increase. atby jamesdanielv - General
just posting code for canned motors. here is the linkby jamesdanielv - General
i think the print looks pretty good as well. the only things i would suggest would be to reduce print speed and use a raft. the layers will be a little bit uneven if support area is small. this is most likely do to flexing of the part from a narrow support, and flexing between cooling layers that are still at glass transition temp. part is basically moving while you are printing. reduce the speedby jamesdanielv - General
raise your heated bed temp to 80 deg celsius if your heated bed can go that high. the convection of heat rising will help keep heat on the abs and it will cool slower. this will reduce curling effect. you can also skirt layers around the object as it prints, this protective skirt can also help keep plastic warm until print finishes. also with abs you want to reduce air flow from fan. you wantby jamesdanielv - General
just a quick comment here. i would think the best method to reduce concerns of fire would be a mechanism that is not tied to the firmware. the firmware in theory could crash and that could be a possible cause. you want something also that relates to the direct issue. excessive heat, i would think that by the time smoke is detected damage is already done and a fire potentially started. I have alwaby jamesdanielv - General
it depends on precision of cnc home built equipment and on backlash. if you have a lot of backlash then it is not likely. cnc can compensate for backlash easily, because it can stop cutting at any point in time. it is different when you are laying down plastic constantly with an extruder.. also speed should be high enough to move at 50 mm or more a second. if the z axis tool head is heavy this miby jamesdanielv - General
insulate the hot end.by jamesdanielv - General
what kind of plastic are you using as feedstock? if you are using pla then the temp needs to be lower.by jamesdanielv - General
thats life. get better bushings, bearings. find out why they wore out so soon. keep spare parts available if possible. parts that last adds cost. how much did you invest in your printer? is it worth it to work on it so often? what can you change in it that would make it last longer? can you slow the printer down and reduce wear? did bearings rust out or were they installed in a way thatby jamesdanielv - General
first you should talk to your vendor before making firmware settings, as i think the board may need to be updated with a firmware that has the eeprom settings enabled. i think you need to look at repetier host printer setup. this is a start config-> printer settings->printer and then change z axis feed rate to less than 100 mm/m are you able to get into the eeprom settings? since i thiby jamesdanielv - Prusa i3 and variants
4.3.6 G91: Set to Relative Positioning 4.3.7 G92: Set Position would you want to change g28 and g29 comands? 4.2.3 G28: Move to Origin (Home) 4.2.4 G29: Detailed Z-Probeby jamesdanielv - General
no and in my experience this is the max range you want. you don't want neighbors devices trying to connect to the bt device. your serial communication with get messed up even if the device eventually is rejected for false pairing. items such as cellphones and pdas are constantly searching and trying to pair with specific bt devices.by jamesdanielv - General
Bluetooth has serial protocol. there are several instructions on how to use Bluetooth. some people it takes minutes, others it takes a day or so to configure. there are sections on several boards for how to attach Bluetooth adapters. for wifi that involves some serious protocols and different processes that are not already in firmware and hardware. most likely you would need custom firmware orby jamesdanielv - General
is the microsteps set correctly? what kind of printer is this? if the microsteps are set incorrectly the motors will move too fast and too much. found this from google search if using ramps look hereby jamesdanielv - General
do you know much about electronics? you could either purchase a voltage regulator that brings voltage down to 5v, or make one using a 7805. not much should be powered from the arduino 5v regulator, at least with out a fan facing the circuit board and a heat sink on the voltage regulator on the arduino board. although for genuine arduino boards i guess people have been doing it without issues forby jamesdanielv - General
I'm not trying to burst bubbles or burn bridges, but state facts. quote 'Uh I work in a very large machine shop and we program everything in decimal inch and every other shop I have worked at used decimal inch. Using metric fasteners does not mean the item was produced with a metric print. Anything we share with other countries is done with dual dimensions.' but not in a machine shop outside oby jamesdanielv - General
I'm sure there are beneficial reasons for USA still using inches. However for the original question why does reprap use mm? I think it is a matter of people in numbers. Especially because that is how the opensource reprap project is designed to run. More people understand metric. It makes sense from a prospective of a collaboration that involves communities throughout the entire metric world. Thiby jamesdanielv - General
different software packages have different benefits, if you are talking about host software. i would start out using repetier host, because it has an easy to understand jog menu. after your printer test is complete and you've done a few prints give cura a try. as for ide and use of serial monitor in arduino serial, it is too easy to mistype characters. so cut and paste them to assure commands arby jamesdanielv - General
also you can verify z height after calibration by reading echo response of command M114, from error log. also one characteristic of z height calibration is that the z axis should constantly move.by jamesdanielv - General
reality no. there needs to be controlled gas air mixture and proper laser focus as well as advancements in timing and algorithm software to control deposits, if we are talking about laser sintering, also dlp has issues with quality control of layers, and resolution. also cost and consistency of materials used. all designs have issues. FFF is currently the most robust method, although at any timby jamesdanielv - General
half your infill speed for top layers. the current speed may be pushing the flow limit of your extruder design, and decrease pla temp. higher pla temp may make it flow faster because it reaches melting temp equilibrium faster, but it also will not cool fast enough for the bridging to not sag on its own weight. if possible turn up cooling fan, lower temp to 190c, and see your results. if at 190 yoby jamesdanielv - Printing
check the resistance of the wires -a, a, and -b, b my guess is the current was too high for this motor and the winding melted, reducing torque. you could also have a driver issue, you will be better off testing with a multiplier the ohm resistance, rather than hooking another driver to that motor, with power off, you can quickly try connecting the driver to another motor under load just to see ifby jamesdanielv - Reprappers
there may be more appropriate topic area here as it is specific for mendel 90 motors are more likely to skip at higher speeds, as torque drops quickly as pulse rate increases, so also reduce travel feedrate.by jamesdanielv - General
seems to take a while. interesting why this would be a web based app? also controlling image intensity value and range for debth would be helpful. thresholds would be nice as well as blending to soften the curves so color variations don't have sharp edges. many sharp edges don't print that well, or look aesthetically pleasing.by jamesdanielv - General
Yoor accuracy may improve on larger diameter filiment if you drill into the tip with an oversized bit slightly so to concave the tip surface. This will help filiment from lumping and produce more even walls. Best of luck!by jamesdanielv - General
look in pins.h and scroll down to where your board is defined, for example motherboard == 34. somewhere in that section are buttons settings, you can zip and upload your firmware and someone here can help you with it!by jamesdanielv - General