Low Speed for 3d Printing application
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- tommylight
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I just had a thought about this. With the current linuxCNC trajectory planner the best way to configure a 3D printer is probably with X and Y as X and Y, Z as filament feed (to include it in the blending) and W as built plate height, as that only moves once per layer, and not (usually) while printing.
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This will really throw a wrench in getting this setup(LinuxCNC/Remora) generally accepted as a 3DP platform since all the 3DP slicers generate XYZA gcode for LinuxCNC/Machinekit and for all others it's XYZE.
I don't know how the look-ahead and blending was implemented but dang, it would have fit well had it been coded to take in the 3 axis to blend. But I get it, CNC standars are XYZ=linear motion, ABC=rotary motion.
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Only because it is conventionally a linear axis and used as a "second Z"why W instead of A?
You could use an input filter to automatically change XYZE code to XYWZ code at the time of loading.This will really throw a wrench in getting this setup(LinuxCNC/Remora) generally accepted as a 3DP platform since all the 3DP slicers generate XYZA gcode for LinuxCNC/Machinekit and for all others it's XYZE.
There is a version of LinuxCNC with blending between all motions. Pathpilot uses it. (Nor sure about Machinekit). I don't know how hard it would be to merge it in to LinuxCNC. The joints-axes changes might make it quite a challenge, or might not.I don't know how the look-ahead and blending was implemented but dang, it would have fit well had it been coded to take in the 3 axis to blend. But I get it, CNC standars are XYZ=linear motion, ABC=rotary motion.
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Should I create a new thread as I try to configure my machine this way and hit problems? ex: LinuxCNC is complaining about my joint_2/W axis having a MAX_LIMIT of 230 and wants +1e99
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So, would the segment look-ahead still drop to 1 segment if I move my extruder(A axis) to one of the 3 linear axis( UVW ) leaving standard coordinate system setup of X Y and Z motion?
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So, would the segment look-ahead still drop to 1 segment if I move my extruder(A axis) to one of the 3 linear axis( UVW ) leaving standard coordinate system setup of X Y and Z motion?
Unfortunately, AFAIK the new TP only works in XYZ.
As I mentioned, there is a newer one out there, the question is whether it can be integrated.
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- tommylight
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For now i have 4 and getting another 4 of the creality printers this week (some mess up with prices so i am still getting 700 to 1300$ printers for 250 to 460 euro a piece !
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So here I am with Scott Alford's Remora firmware on SKR v1.4 controller board in a Creality Ender3 3D printer with LinuxCNC on a Raspberry Pi and finding out there's no look-ahead path blending because I have an extruder motor on the A axis.
It works but it seems like it's being held back greatly because of the 1 segment fallback. So it'll be a tough road to get people excited about using LinuxCNC on 3D printers even though it can be done for less than $100 and the rPi box is tiny compared to the big gray PC box typically needed for LinuxCNC.
Sounds like it's going to need an on-the-fly file filter and swapping the extruder axis(A) for the motion axis(Z) and getting Z away from ABC and over to linear U, V or W axis.
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Yes, I think there should be, because it is a good potential use case for linuxcnc (best option for 3d printing but not the easiest) also, because it can hopefully centralize discussion related to 3dprinting into fewer sections, making it easier to find information for setup and about problems that might not exist in normal cnc operations. the extruder axis/tp lookahead being a good example.Sorry to hijack the topic, but what are the chances of having a 3D printing section of the forum and is anyone here interested in it?
not yet it isnt. Octoprint is great and all, but it seems kinda backwards way of doing it, now that the rpi4 is out and has some guts to it. With the increased availability of linuxcnc on a small, cheap platform, and the excellent work everyone has done from the rpi images, to the other embedded platforms like H3, to scott alfords work with the rpi and existing 3d printer boards, the shift is on its way, that much can be seen with how many more rpi4 related threads there have been in the past few years.not LinuxCNC related but it takes an afternoon to switch one to it !
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