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JG Maker Artist D

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  • JG Maker Artist D


    As mentioned in another thread, I recently received the pro version of this printer, yesterday in fact. I know Irv has 1 on order too, so I thought I would jot down some initial observations & impressions (please note, I wrote these down as I observed or thought of them, so no particular order of importance is implied):
    1. as with my Ender 5, the printer came very well packed; a fairly large, square box.
    2. it seems pretty well made. However, I did note that the gantry cross-member is made of plastic rather than aluminum extrusion.
    3. there are numbered dots on the ribbon cables. The numbers must face each other. IOW, when you look at the cables for #5, you can see both 5's at the same time.
    4. the printer includes to brass bristle brush pockets that clean off the nozzles. They are #9 & #10, not #6 and #10.
    5. there are 2 sets of wires running from the top to the bottom of the gantry that connect the 2 filament sensors. They're really a bit on the short side. 2 to 4 cm more wire would make them much easier to connect.
    6. like most Creality printers, the printbed surface is removeable (it's magnetized).
    7. on the printer I received, the spool holder spools are different: 1 is flanged at both ends & the other only at 1 end.
    8. the booklet shows the Z Axis Limit Switch as being on the right-hand side of the printer. Mine is on the left.
    9. the way the hotends are designed, the heat break cooling fan cannot blow air over the heater block. I noticed that it feels quite a bit hotter than my Ender 5, so I may need to use lower temps when printing.
    10. some of the pre-installed bolts on the base were a little loose, so I tightened them. It's a good practice to always check the fasteners on any new piece of equipment anyway.
    11. the USB connector on the printer is the original Type B (D shaped) one.
    12. the SD card reader takes normal SD cards, not microvSD cards. I for one, appreciate this, as micro SD cards can be difficult to handle.
    13. the supplied CIE AC cable is kind of short -- only 5 feet.
    14. the main hotend fans are pretty noisy, certainly compared to my Ender 5.
    15. WARNING!!! the Z Limit Switch & Filament Runout Sensor wires can be confused. On my printer there are 2 connectors on the left side: a white 1 (Z limit) & the other black (filament sensor). There are also 4 receptacle connectors: a white & a black on each side. The black ones can be hard to see as they're a bit hidden inside the metal blocks. The connectors are color co-ordinated: white into white, black into black. This means the white connector on the right side goes unused.
    16. the printer has a color touch screen, but please note that the screen requires quite a firm press, and there is no change in brightness or color to indicate whether you pressed hard enough or not.
    17. the manual does describe this, but I think it bears repeating. The Z Offset for Extruder 1 (left hand) is set using the Z Limit Switch. It's done by using the menu system to move the nozzle to the center of the bed (Point 1). I found it necessary to back out of the menu after each adjustment in order to get it to recognize the change in the adjustment screw. I also found it easier to get at the adjustment screw by using the ball-ended Allan key from my Ender 5.
      Once the Z Offset for Extruder 1 is set, then the corners are levelled using the typical adjustment wheels. Points 2 through 5 of the menu system correspond to the 4 corners of the bed.
      The Z Offset for Extruder 2 (right hand) is done through the T-offset of the menu system. This menu only works for Extruder 2. Please note: I found I could not set the Z Offset to values like 0.15. It would round up to 0.2. 0.05 would round up to 1.0. I did not see any point to adjusting the corners for Extruder 2. Any changes made would screw up Extruder 1.
    18. the metal actuator of my Z Limit Switch wasn't directly under the adjustment screw, so I bent it slightly to the right.
    19. there is a PDF copy of the manual on the supplied SD card, which can make it much easier see details in the images.
    20. the printer does accept g-code files, including ones produced by Cura. In fact it comes with Cura 4.4.
    21. the printer I received is v2.2.0. The firmware is something called Robin_Pro35. The board is an MKS Robin Pro.
    22. on the hotends, there are 2 silver 'buttons'. The top, larger button is used to open the extruder to permit feeding of filament. The bottom, smaller button is used to release the nozzle assembly. It's worth noting that this printer has its own, unique nozzle system. I think it might prove very useful in that it should be possible to dedicate nozzles to specific types of filament: i.e. this nozzle is for PLA, this 1 is for PETG, a 3rd 1 is for TPU, and so on. This should really help with avoiding clogs.
    23. my printer came with 2 pre-installed nozzles (I think they're 0.4mm), 4 more 0.4mm nozzles in a bag, plus 2 0.6mm nozzles in another bag, & 2 0.8mm nozzles in yet another bag. Not sure what I'll use them for, but I now have them.
    24. the paper version of the manual says there is a control knob on the front edge, below the display screen, but my printer doesn't have 1. The digital version on the SD card doesn't show it.
    25. there is a video on the SC card that shows how to assemble the printer. However, people who really dislike discrepancies between what manuals say & what they actually have are likely to be frustrated. There are a number of relatively small, but real differences between the 2. I put it down to the company's ongoing development of the printer.
    I've been able to level the bed but, so far, I can't print from the SD card. I select a file, tell it to print, it asks me to confirm, brings up a print progress screen, but nothing happens.... no movement at all.
    Last edited by Ender5r; 04-22-2021, 03:51 PM.

  • #2
    Just completed printing the money cat model that came with the printer. It's the same 1 I tried to print from the SD card, but this time I printed it from Cura on my Surface Tablet. That worked. Really not sure what's going on with the SD card issue. Will be interesting to see if Irv runs into it.

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    • #3
      That is a valuable document you are creating for anyone else that buys one. Like me perhaps. It will be interesting to see in the future how much the "out for sale" model will vary.

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      • #4
        So today I addressed the task of extruder calibration. This proved to be problematic. Just like the creator of this video (https://www.youtube.com/watch?v=nQiY2gAVQpM) said, the firmware only has 1 setting for extruder steps/mm. It appears to apply to both extruders. Of course, manufacturing tolerances make it highly unlikely that both extruders are identical, so their steps/mm won't be the same. I thought about this, trying to figure a way around it. I decided, since the real issue is how much filament comes out of the nozzle in a given timeframe, that I could use Flow Rate, since it can be set separately for each extruder.

        After half a dozen trial extrusions, tt turned out the Flow Rate values for the 2 extruders are quite different: 118% for the left 1 & 106% for the right. Fortunately, unlike the creator of the video, my printer seems to have fairly consistent extrusion. His didn't, giving him different results each time, leading him to give up on reviewing the printer. To be fair, he was reviewing a beta version of the printer. JGMaker may have addressed that issue by the time they released the printer to production.

        In the process of testing the extrusion rates, I ran into another issue: how exactly does 1 tell Marlin which extruder to use for any given command? I searched online but didn't really find anything. Then I thought, "what if I take a really simply model, like the levelling squares I use to level printbeds, & assign 1 copy to the left extruder, and another to the right?". I did that, then sliced the models & saved the gcode. Upon editing the gcode file it because obvious: T0 selects the left extruder & T1 selects the right.

        I don't mean that T0 or T1 is added to other gcode commands. T0 is a command in & of itself or, rather, T is a command & 0, 1, 2, etc. are parameters to select specific extruders. Once an extruder is selected, then all following commands apply to that extruder. For example: a T0 command, following by G1 X50 would move the left extruder to the 50mm location. A T1 followed by a G1 X50 would move the right extruder. I don't know, but I kind of wonder of the T command stands for "Tool".

        It's very handy to know this info when using Pronterface
        Last edited by Ender5r; 04-22-2021, 07:17 PM.

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        • #5
          That was a clever way of finding out find the command to select the extruder. You must be ready to print. Good luck.

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          • #6
            Another thing I found relates to 2-color printing on the same model. It's pretty easy to damage the printer by not using the correct mode. In the menu system there is a button called X Mode. It brings up a page with 4 options: Full Control, Auto-park, Mirror, & Duplicate. If someone has the printer in Full Control mode (the default) and tries to print a 2-color model, it's almost certain that the 2nd extruder to start printing will crash into the 1st. Trust me, I know. The secret is simple: put the printer into Auto-park mode. When the 1st extruder is finished it's work on a layer it will move to the brush pocket at the edge of the printer before the 2nd extruder starts it work on that layer.

            I've only done 1 2-color print, a very simple 1. It's a top & bottom model, 1 extruder printing the entire lower portion before the other extruder prints the entire upper part. I do not yet know what happens if there are 2 colors on the same layer: i.e. does 1 extruder print all of its part of the layer and auto-park before the 2nd extruder starts, or do they go back & forth on a layer, following the path as dictated by the slicer?

            Click image for larger version

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            The left photo shows the issue I'm having with some roughness on the top surface. Look closely at the right photo, where the colors meet, & you will see a slight gap between the colors.
            Last edited by Ender5r; 04-25-2021, 04:15 PM.

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            • #7
              The removeable printbed surface is that black, textured stuff that makes it really hard to remove finished prints. And, if the nozzle is too close to the bed the really thin layer of filament is almost impossible to remove. Magigoo really helps, but it's still a pain. I wonder if using the bed unheated would help?

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              • #8
                It seems logical if a heated bed is used to increase adhesion.

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                • #9
                  Lowering bed temp to 40C has helped with releasing prints, even with PETG.

                  Did another 2-color print today. Another top/bottom print, bottom yellow, top red. The red is lettering.

                  Oh, & printing from SD card started working; don't know why.
                  Last edited by Ender5r; 04-23-2021, 08:15 PM.

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                  • #10
                    There is an evil spirit in my printer too.

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                    • #11
                      This printer comes with 2 brush pockets. The idea is they're parking places for the nozzles when not printing. The brass bristle brushes are supposed to clean oozing filament from the nozzles. It's a mixed blessing. The issue is that when a print is about to start, the printer tries to home the extruder assemblies, even before the nozzles are hot again. This has led to a few times where 1 of the extruders 'grinds' against the drive belt because it can't pull the extruder out of the brass brush -- because it's glued to the brush by the oozed filament. I've taken to manually moving the extruders off the brush once they've been wiped clean. That, or preheating the nozzle(s) before even starting the print, so the oozed filament will be soft enough to let the extruder move.

                      I've also found the brushes can build up with oozed filament fairly quickly. Removing the all-metal brush(es) from their plastic holder, grabbing them with pliers, & heating the oozed filament with a heat gun makes it possible to use a 2nd set of pliers to pull out 90% of the oozed filament.
                      Last edited by Ender5r; 04-24-2021, 10:37 AM.

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                      • #12
                        I bet there will be a lot of things to learn about this printer even if it works well.

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                        • #13
                          Discovered something pretty cool today. ! of the issues with dual extruder printers is getting the printer to switch extruders when printing models that weren't designed for multi-extruder printers.

                          I searched for ways of doing this in Cura; perhaps an extension, but what I found is perhaps even better: https://www.youtube.com/watch?v=YdNUDPJM-PI.

                          Last edited by Ender5r; 04-24-2021, 05:18 PM.

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                          • #14
                            I guess I'm old and certifiably brain dead but I didn't get the message.

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                            • #15
                              Irv Shapiro, I have a suggestion for you re: the Artist-D printer. On mine, the Z limit switch adjust screw was a little misaligned from the switch itself. Rather than try to bend the springy metal piece that triggers the switch, I recommend screwing an M4 nut onto the adjustment screw so it is flush with the bottom of the screw & then crazy glue it in place. That will create a much larger triggering surface, so it won't miss the metal trigger.

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