Good Morning all, i recently bought a repap i3 3D printer off of craigslist and i am unable to connect it to my computer. I feel like i have done everything and am out of ideas. It's a COM3 Port with 9600br. I have tried ponterface, cura, and repetier on both my PC and macbook. All help is appreciated, thank you. https://reprap.org/forum/read.php?1,771931,771931#msg-771931 Mon, 20 Apr 2026 18:46:02 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,771931,779216#msg-779216 https://reprap.org/forum/read.php?1,771931,779216#msg-779216 Wired_Bob General Thu, 20 Jul 2017 11:53:14 -0400 https://reprap.org/forum/read.php?1,771931,778596#msg-778596 https://reprap.org/forum/read.php?1,771931,778596#msg-778596
In the past when I have seen access denied to a serial port its been one of two reasons, that port is in use to something else or your have been blocked from accessing it administratively.

So to that,
Are you the system administrator with admin rights? If not ask your administrator to open access.

Make sure nothing else is using that port. You might try reassigning a new port to it.
If you are using a windows os you can access your Printers and Devices. Check the properties and make sure that the device is indicated as installed properly and that there are no conflicts.]]> eatumup General Mon, 17 Jul 2017 19:19:04 -0400 https://reprap.org/forum/read.php?1,771931,775413#msg-775413 https://reprap.org/forum/read.php?1,771931,775413#msg-775413 Wired_Bob General Wed, 28 Jun 2017 15:45:13 -0400 https://reprap.org/forum/read.php?1,771931,773627#msg-773627 https://reprap.org/forum/read.php?1,771931,773627#msg-773627
Do you know if you're connected to board?

if you unsure of what's occurring, look up how to output USB devices for example, (https://github.com/todbot/usbSearch/blob/master/usbSearch.vbs)

If there is no change between plugin device in and not, it means your USB device is fried on the Arduino board. If you have a multi-meter and time it's easy to fix. In my case I just buy another board as they are 5 bucks.

If you really want to see what might be occurring, but I do not suggest, get a UART cable connect and watch serial output.

If you're having this much trouble, from a distance it sounds like a blown USB port on board.]]> ebraiman General Fri, 16 Jun 2017 12:13:49 -0400 https://reprap.org/forum/read.php?1,771931,772153#msg-772153 https://reprap.org/forum/read.php?1,771931,772153#msg-772153
I have never had an issue with the "NON GENUINE DEVICE FOUND!" error that you were talking about, and as for fixing my "access is denied" error, i have rebooted my computer many times.

Thanks all.]]> tatelewis General Tue, 06 Jun 2017 16:53:18 -0400 https://reprap.org/forum/read.php?1,771931,772020#msg-772020 https://reprap.org/forum/read.php?1,771931,772020#msg-772020
"Access is denied." is a os error

reboot your computer and try again.

open up your device manager and take a screen shot of the device and post it here (making sure there are no device driver errors) Will also show us if its a ftdi232 or ch340 or what ever device this board has

Are you 100% sure its com3, ie it goes away when you remove the controller and comes back when you plug it back in?

open up the ardunio serial monitor, try various baud rates, is it telling you anything eg "NON GENUINE DEVICE FOUND!" is a well known issue]]> Dust General Mon, 05 Jun 2017 23:27:24 -0400 https://reprap.org/forum/read.php?1,771931,772010#msg-772010 https://reprap.org/forum/read.php?1,771931,772010#msg-772010 tatelewis General Mon, 05 Jun 2017 20:21:52 -0400 https://reprap.org/forum/read.php?1,771931,771987#msg-771987 https://reprap.org/forum/read.php?1,771931,771987#msg-771987 DjDemonD General Mon, 05 Jun 2017 16:45:05 -0400 https://reprap.org/forum/read.php?1,771931,771986#msg-771986 https://reprap.org/forum/read.php?1,771931,771986#msg-771986
@DjDemonD I have been working for 6 hours straight on this trying to figure it out hahahah.]]> tatelewis General Mon, 05 Jun 2017 16:44:14 -0400 https://reprap.org/forum/read.php?1,771931,771983#msg-771983 https://reprap.org/forum/read.php?1,771931,771983#msg-771983 chris33 General Mon, 05 Jun 2017 16:26:38 -0400 https://reprap.org/forum/read.php?1,771931,771980#msg-771980 https://reprap.org/forum/read.php?1,771931,771980#msg-771980 DjDemonD General Mon, 05 Jun 2017 16:22:54 -0400 https://reprap.org/forum/read.php?1,771931,771977#msg-771977 https://reprap.org/forum/read.php?1,771931,771977#msg-771977 tatelewis General Mon, 05 Jun 2017 16:12:59 -0400 https://reprap.org/forum/read.php?1,771931,771973#msg-771973 https://reprap.org/forum/read.php?1,771931,771973#msg-771973
I started with a secondhand i3. Had to download marlin, work out how to configure it for my machine, upload it to the controller, then tune it and figure out the things that didn't work and fix them but it taught me 3d printing and it was pretty sweet when it made a decent object (after 20 total f*ck ups).

The difficulty with buying a secondhand printer like this is that you rarely get the configured firmware provided, so you can flash it back to the controller or replace the controller with known configured firmware.]]> DjDemonD General Mon, 05 Jun 2017 16:06:34 -0400 https://reprap.org/forum/read.php?1,771931,771969#msg-771969 https://reprap.org/forum/read.php?1,771931,771969#msg-771969
Connecting...
[ERROR] Could not connect to COM3 at baudrate 115200:
Serial error: could not open port COM3: [Error 5] Access is denied.

Connecting...
[ERROR] Could not connect to COM3 at baudrate 250000:
Serial error: could not open port COM3: [Error 5] Access is denied.

stupid question... is there like a power button on the printer itself? because there is no screen on it, and the only way that i can indicate that it is on is a green light in the power supply after i plug it in, and the face that i can find it in the device manager panel. I tried plugging in a microSD card into it with the file loaded with the correct "save as" name to try to have it start automatically that way, but no luck.

Thanks all, again for the help.]]> tatelewis General Mon, 05 Jun 2017 15:38:02 -0400 https://reprap.org/forum/read.php?1,771931,771967#msg-771967 https://reprap.org/forum/read.php?1,771931,771967#msg-771967
If the printer is using typical 8-bit electronics then the correct baud rate will be 115200 or 250000. If it's using 32-bit electronics (which is unlikely for an i3) then the baud rate setting probably won't matter.]]> dc42 General Mon, 05 Jun 2017 15:24:24 -0400 https://reprap.org/forum/read.php?1,771931,771966#msg-771966 https://reprap.org/forum/read.php?1,771931,771966#msg-771966 chris33 General Mon, 05 Jun 2017 15:20:33 -0400 https://reprap.org/forum/read.php?1,771931,771948#msg-771948 https://reprap.org/forum/read.php?1,771931,771948#msg-771948
The connection failed with the following error; access to the port 'COM3' is denied..
Make sure your printer is connected, enabled and connection data is set correct. open printer settings?]]> tatelewis General Mon, 05 Jun 2017 14:07:18 -0400 https://reprap.org/forum/read.php?1,771931,771946#msg-771946 https://reprap.org/forum/read.php?1,771931,771946#msg-771946
yes i see the COM3 inside of the device manager. The printer is plugged into the wall and is plugged into my computer via microUSB to USB. not really sure what i'm doing wrong but it's really frustrating:)o]]> tatelewis General Mon, 05 Jun 2017 13:54:11 -0400 https://reprap.org/forum/read.php?1,771931,771942#msg-771942 https://reprap.org/forum/read.php?1,771931,771942#msg-771942 DjDemonD General Mon, 05 Jun 2017 13:38:51 -0400 https://reprap.org/forum/read.php?1,771931,771931#msg-771931 https://reprap.org/forum/read.php?1,771931,771931#msg-771931 tatelewis General Mon, 05 Jun 2017 12:19:27 -0400