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I have a Tronxy P802M (very similar to the Anet A8, but using a Melzi2.0V5 board) that seems to work fine (I just finished building, and axes movement and the integrated display work) but when I try to connect to the printer from my Simplify3D on Windows 10, I get the following:

[...]
  Connected to machine!
SENT: T0
READ: ok 0
READ: wait
SENT: M105
READ: ok 0
READ: T:24.44 /0 B:23.33 /0 B@:0 @:0
  Connection failed.

My other printers all connect fine.

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  • $\begingroup$ Try doing this in Simplify3d and see if it works - Go to Tools --> Firmware Configuration and then click the Communication tab. Set the flow control to "Hardware flow control". $\endgroup$
    – tjb1
    Jan 26, 2017 at 15:10
  • $\begingroup$ Nope, did not change much, except now the initial connect does not work. I also tried a different USB cable and using a direct USB port as well as suing a USB2 hub... $\endgroup$
    – brandstaetter
    Jan 27, 2017 at 8:46
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    $\begingroup$ Okay have you set the Baud rate? I know thats an issue with slic3r. Can you see the printer under devices? $\endgroup$
    – StarWind0
    Jan 27, 2017 at 17:22
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    $\begingroup$ Yes, Baud rate is set the same on both sides (otherwise there are different errors). The COM port shows up under devices. $\endgroup$
    – brandstaetter
    Jan 28, 2017 at 20:42
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    $\begingroup$ This is more suited as a comment. Moreover, the fact that he's receiving something legible (like the "T:24.44" line), means the baud rate must be correct. $\endgroup$
    – Tom van der Zanden
    Jan 29, 2017 at 8:49

3 Answers 3

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If you are using a USB 3 port to connect the printer to your PC, try connecting via a USB 2 hub.

My Vector 3 will not work on a USB 3 port, only on a USB 2 or lower. The device correctly mounts and presents but serial communication fails. One of my laptops only has USB 3 ports on it, so to work around the limitation I connect via a cheap USB 2 hub.

I have heard that many 3D printers use a similar USB to UART / serial connector chip and that they suffer from similar limitations as a result.

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  • $\begingroup$ already tried that, did not change anything :( $\endgroup$
    – brandstaetter
    Feb 1, 2017 at 15:23
  • $\begingroup$ The cheapest, and common, USB to Serial IC (i.e. an FTDI clone) in use, seems to be the CH340g $\endgroup$
    – Greenonline ♦
    Feb 1, 2017 at 16:18
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    $\begingroup$ @Greenonline The CH340 is not an FTDI clone. Not every USB to Serial IC needs to be an FTDI clone. The CH340 happens to be an independent design. $\endgroup$
    – Tom van der Zanden
    Mar 12, 2017 at 13:00
  • $\begingroup$ @TomvanderZanden - OK, understood. :-) I guess I should have said substitute rather than clone. $\endgroup$
    – Greenonline ♦
    Mar 12, 2017 at 13:05
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The Simplify3D support site mentions to disable the "wait for startup command" option in the firmware configuration for S3D.

This allows me to make a rudimentary connection to control the printer, however e.g. during the bed levelling wizard of S3D, the connection still breaks off.

It works reliably with Octoprint. I'll consider that good enough.

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Try changing your port in the control menu. By default, mine is set to COM 1 and I have to change it to COM 3.

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  • $\begingroup$ I get a response from the printer: READ: T:24.44 /0 B:23.33 /0 B@:0 @:0. It just aborts the connection due to some timeouts. Looks like S3D is very strict when it comes to bad connections or slow boards $\endgroup$
    – brandstaetter
    May 5, 2017 at 12:07

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