3D Printing Without Wi-Fi

Today I was unable to send a print job wirelessly from my Mac to my Bambu Lab A1 3D printer because our Spectrum internet service went down.

I am accustomed to sending print jobs wirelessly to my 3D printer, in fact I have never done it any other way. Because I can turn my iPhone into a hotspot with my Visible Wireless cellular plan, I connected both my laptop and 3D printer to my hotspot. The connection was slow partly because I have the basic plan with 5 Mbps hotspot speeds but also because my 3D printer is located on the first floor where cellular reception is somewhat spotty. It is good enough for phone calls but not so great when it comes to transmitting larger amounts of data.

I sliced my model in Bambu Studio as I normally do. I then sent the print job which normally occurs in 2 phases. First, Bambu Studio uploads the print job from my laptop to Bambu Lab’s cloud service. Second, it downloads the print job from the Bambu Lab cloud to the 3D printer. It slowly but successfully uploaded the 4.1 MB print job to the cloud. However, the 3D printer struggled for a while to download the print job from the cloud and eventually failed.

Therefore, I reverted to the tried and true local printing method via microSD card which bypasses the internet. After slicing my model in Bambu Studio, instead of sending the print job via the cloud, I chose the “Export plate sliced file” option. From there, a “Save sliced file as:” dialog box allowed me to save a .gcode.3mf file. I placed the .gcode.3mf file in the root directory of the microSD card that came with my Bambu Lab A1 3D printer and powered up the printer. After staring up, I pressed the “Print Files” option on the home screen and selected my .gcode.3mf file. From there, I was able to toggle options for AMS, dynamic flow calibration, and bed leveling, just as I would have done when sending a print job from Bambu Studio via cloud printing. It worked like a charm.

With my first 3D printer, a Creality Ender 3 V2 Neo, I printed exclusively via microSD card because it did not offer a wireless option (at least not natively). Although printing via microSD card is not complex, it certainly is more convenient for me to send print jobs wirelessly than to transfer my microSD card between my computer (2nd floor) and 3D printer (1st floor). Some folks have concerns about privacy when sending print jobs through Bambu Lab cloud services, but I have no such concerns because all my prints are for fun and entertainment, and I have nothing to hide. I like the convenience of cloud printing and will appreciate it even more after my Spectrum internet service is restored!

Spectrum Internet - Modem Activation

This morning we had experienced what seemed like yet another internet outage. Our Spectrum internet service has been spotty during the pandemic, and it came as no surprise that we lost internet again today. I decided to run through my typical troubleshooting steps to determine if the problem could have been due to my computer, the mesh router, modem, or ISP. When I attempted to reboot the NETGEAR C3000 cable modem/router, I discovered that all the lights were off, and despite toggling the power button and removing/inserting the power supply, I was unable to get the modem to work. Time to get a new modem.

Spectrum provides a list of authorized modems that are compatible with its network. Fortunately my local Costco warehouse had a NETGEAR CM1100 cable modem (modem only, no router; I don’t need a modem/router because I already have a mesh router) in stock, and it is listed by Spectrum as approved for internet speeds up to 1 Gbps.

I thought that replacing my modem should have been easy as plugging in the power supply, turning on the modem, and connecting the ethernet cable between my modem and mesh router. However, on my 2016 MacBook Pro running macOS 10.15.7 (Catalina), I was only getting speeds of 0.85 Mbps even though I subscribe to a 60 Mbps plan. On my mid-2007 iMac running Mac OS X 10.11.6 (El Capitan), I saw the following pop-up window:

Although clicking the “Get Started” button returned me to the same screen resulting in an infinite loop, fortunately it provided a link to https://activate.spectrum.net/ at the bottom of the window which I visited via a web browser. After logging in, it told me that my modem was offline.

Clicking the 3 dots to the right of the modem icon gave me an option to replace my modem. Upon selecting that option, I entered the MAC address listed on the new modem. A few minutes later, my new modem was successfully activated, and I am back to normal internet speeds.