Show all posts by user
http://reprap.org/wiki/CoreXY
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
Hi guys. Unfortunately I am not getting a sucessful print with a larger nozzle. I have recalibrated my extrusion, decreased the extrusion width, and recalibrated my bed leveling. I have also verified z-steps per mm (by putting the nozzle at bed level, then lowering the bed by 100mm and measuring). The first layer looks pretty good but the second layer is terrible. It looks like it is too higby Qdeathstar - CoreXY Machines
Re: New Printer Design - 8 years ago
The other isssue with glass beds is if there is variation, many z-sensors like the duet ir or induction sensors won’t detect it because they don’t probe the glass...by Qdeathstar - CoreXY Machines
Re: My coreXY design is progressing to the build stage - 8 years ago
Gotta make it worth the dudes time..... he is probably making about $15 for 20 minutes of work, not crazy.by Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
Ok, so on XZ plane and YZ plane, both horizontals measure 141mm on each plane. On the xy plane, one measures 141mm and the other measures 140mm. So those are a little off. What is a realistic margin of error for a reasonable well built machine? That looks like a decent tolerance over the size of the object, but I have no idea really. Also, assuming the x and y axis was square before the belts, isby Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
It’s still printing, got about 2hours left on it, but it’s looking good while it’s printing.by Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
I am not exactly sure by what you mean “are the diagonals matched”... do you mean between the stepper motors and idler pulleys? Step/mm are set to the same value x/yby Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
The Digital Dentist, I noticed in this topic: You have a calibration object that you designed to help calibrate the printer. My question is do you still recommend it it? And, also, you said to calibrate the E-steps before using it. Im not sure that makes sense and so i wanted to double check with you. Right now, I am using the large multi-stepped triangular object and it looks like while thby Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
no, i am essentially back where i started when i posted that. That suggestion was made with the corrrct xy steps. I changed them to the wrong steps before calibrating using the tool in the calibration guide. I am going through that calibration guide the digital dentist linked to now with the correct steps/mmby Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
nevermind, my x-y steps actually were 106.67 not 100mm. I was going through my purchase history to determine the pulley teeth, and used the right one originally but the wrong one when use DC49s configuration over the weekend. Now i am able to print at least several layers of the calibration item without it skipping at a steps per mm that makes sense, so on to fine tuning the calibrationby Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
Didn’t really help. At all.by Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
NO LONGER RELEVANT. This is the top down look at one of the failed prints that had a layer shift. To me, it looks like there is a lot of over lap and that the groves made into the plastic are from the hot-end digging through rather than plastic being layed down. Here is the bottom. Im kind of a crummy photo guy, but you can see the first layer prints OK, but once you get to the upper layerby Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
NO LONGER RELEVANT This does not make a lot of sense. I have been struggling to print that test option sense last night. What would happen is when it is printing the 45* angle infill (one stepper moving) it would skip steps and the layers would shift. I thought this was because the motors were straining so I lowered my print speed to 20mm/s and lowered my jerk to 50mm/min and then i noticedby Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
Thanks DC42. I used your calculator and found out that my steps per MM were off because i calculated with 30 teeth instead of 32 teeth. Oops. It also says the maximum speed: Speed at which torque starts to drop (low slip angle): 125.2 mm/s @ 17.7 kHz So, as long as all my speeds are less than that i should be good? TheDigitalDentist, thanks. That would explain why my steps/mm could be off buby Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
I have printed a few things with my printer and im trying to get it calibrated. One issue that i am having is that it seems to be over extruding. However, if I tell the printed to extrude 20mm and measure it before the extruder, it appears dead-nuts on. I am calibrating the extrusion width using this method: And it says i should set my extrusion multiplier to .83 after initial testing. My qby Qdeathstar - CoreXY Machines
Re: Large CoreXY Z Lift - 8 years ago
The thing about the duet boards is that the developers are pretty good at taking good ideas, and making them work with their boards. They constant work on the software for the hardware and have new updates about once a month.by Qdeathstar - CoreXY Machines
Re: My coreXY design is progressing to the build stage - 8 years ago
Thanks! my steps/mm worked out to 1500by Qdeathstar - CoreXY Machines
Re: My coreXY design is progressing to the build stage - 8 years ago
The Digital Dentist, How did you figure out the steps per MM for the rhino gear?by Qdeathstar - CoreXY Machines
Re: Cable management to the X-Y carriage - how did you do it? - 8 years ago
i like it, it is self supporting, it your printer was very big i thing you could just add a hook,... I am not printing yet though and i haven’t tested it fully. It has 20awg wire in it which is good enough for the 40w heaters my set up is using.by Qdeathstar - CoreXY Machines
Re: Cable management to the X-Y carriage - how did you do it? - 8 years ago
I’m using a db25 cable and two breakout boardsby Qdeathstar - CoreXY Machines
Re: My coreXY design is progressing to the build stage - 8 years ago
Does a cpap pump move the air at low pressure? That’s a really big hose... takes up quite a bit of real estate. One of the advantages of a air pump is that it blows cool air instead of hot air in the build chamber..by Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
I did a little more research, and what ive found out is that PVC turns soft at around 90c..... hair dryers dont get hotter than 60c according to what i read because that is the temperature at which the scalp burns, so to protect the manufacturers from potential lawsuits, they limit the temperature to that amount. I want to get the heat chamber up to about 60c, so maybe it won't work... but, i thiby Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
The part cooler has worked excellent in my delta printer, so I have no reason to doubt it will work in the coreXY. As far as the pvc pipe I’m not sure how it will hold up, but I saw it on the internet so I decided to give it a try.... I don’t think it will be an issue, my target temp is around 60c. If worse comes to worse I can get some imc or maybe grey pvc that has a higher temperature tolerancby Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
Getting closer. I got the hot end together. I ended up using a dB-25 connector, plenty of wires for the dual hotends, stepper motors, thermistors, fans, and proximity sensor. I haven’t fully tested if the cable can handle the current, but worst case they do sell 20awg db12 cables that are a little more expensive that should be capable for 60w at 12v. A picture of what it looks like unpopulby Qdeathstar - CoreXY Machines
Re: My coreXY design is progressing to the build stage - 8 years ago
They do have similar bars available for purchase, I’m gonna get one for my printerby Qdeathstar - CoreXY Machines
Re: My coreXY design is progressing to the build stage - 8 years ago
Quotethe_digital_dentist On a slightly different subject, I recently pulled a CPAP machine from the hack-rack at the makerspace. I disassembled it and pulled the blower out of it. It's about 90mm in diameter, and has a 20k rpm (max), 3 phase BLDC motor. I also recently had some PCBs made for the MCP8063 3 phase BLDC motor driver chip with PWM input. I'll be testing the blower as a print cooliby Qdeathstar - CoreXY Machines
Re: Zasquatch's CoreXY Design/Build - 8 years ago
80 pound bed? Yikes! Your printer is very attractive looking. Those Rhinos and 2" aluminum tubing are beginning to get ubiquitous in the corexy world. A nod to the digital dentist!by Qdeathstar - CoreXY Machines
Re: Cyclonit's CoreXY - 8 years ago
Probably in them cheap MGN rails there is a lot of play, so the rails don't bind....by Qdeathstar - CoreXY Machines
Re: Witor's coreXY - 8 years ago
yeah, but they are made to a specific price, not to a specific performance. Y carriage is probably OK but m not sure testing for a static load is too accurate when determining the stresses encountered while 3d printingby Qdeathstar - CoreXY Machines
Re: Poor Man's Digital Dentist Core XY build - 8 years ago
hah! Making chips is fun. Too bad the tools don't make the printer.by Qdeathstar - CoreXY Machines
Re: Witor's coreXY - 8 years ago
have you considered that your loads aren't static, and there is also twisting loads and vibrational loads?by Qdeathstar - CoreXY Machines