BIQU B1 by BigTreeTech - This things neat

Wilhelm02 · March 23, 2021, 5:07pm

The purge line was fine for the print that’s running now after I fiddled with some of the settings. Must have gotten lucky. Thanks for checking GitHub.

Glenn · March 23, 2021, 5:19pm

Ok here is it. Not really as much there as I though but there’s some helpful stuff there specific to B1’s I’ll post more f I find them again.

gist.github.com

https://gist.github.com/looxonline/808a204f4f881462403f2baeefc1f69b

biqu_b1_getting_started.md

# Getting started with your B1

Congratulations on getting a shiny, new B1. It is a great machine for beginners and experienced users alike but like all machines you will need to do some things just right to get the most out of it. This is a brief guide which explains how to put together your B1 to ensure that the mechanics will just work.

## Installing the uprights

When installing the uprights it is crucial that they be at 90 degrees to the **base** and not the bed. The bed will be sorted out later. If you fail to ensure this then you are likely to experience later issues with ABL and/or the nozzle scraping across the print.

In order to ensure that both uprights are at 90 degrees you will need to use a set square. Eyeballing it alone is not enough and relying on the provided brackets is also not enough since they include some play by design in order to allow you to manipulate the frame to overcome manufacturing tolerances. Place the set square up against the frame and the base as can be seen in the image below (note that it is not pushed all the way against the frame in the image but you should) and ensure that both sides of the frame are a perfect 90 degrees.

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Your purge line comes from your slicer are you using Cura to slice your files? the Start Gcode is in there and thats where the positioning comes from but not if the bed is in the wrong place, like it was not homed properly

Wilhelm02 · March 23, 2021, 10:57pm

Thank you Glenn!
Les

Wilhelm02 · March 31, 2021, 3:41pm

There’s been an amazing ‘AHA!’ with my BIQU lately. The Poltergesit that lives inside it must have heard me talking about boxing it up and relegating it to the cold and dark attic. Long story short; along with going back to simpler Cura profiles I’ve started using the Marlin Mode exclusively. A manual level is followed by the BLT and once completed, the file loaded and ‘tuned’ it does another BLT level and then goes to work. I’ve also discovered that the lights really do have a pupose. I thought they were just a nice sales add-on. But they really do tell you where the printer is at in terms of the prep process. It still makes mournful fan noises when starting up, even after loosening the screws to the fan housings, but that fades away after about a minute or so and it runs nice and quiet with very good print results.

Glenn · March 31, 2021, 5:02pm

I added the commands to my Start g-code for the lights to work like that, Did you do anything like that to make them work?

Wilhelm02 · March 31, 2021, 7:36pm

Hi Glenn,
Nope. I just started using Marlin Mode and it happened. At first I kept scrolling down and turning them off wondering why they were coming on. Then on one print I left them alone and as I watched them change colors along with the temp changes on the screen it dawned on me what they were doing. It’s actually a pretty nice feature.
Les

Glenn · March 31, 2021, 7:50pm

Oh thats interesting. What colour do you have and whe. Does it change? I used Marlin regularly before this new firmware and haven’t been there since but in mine it was the same. I could just select the colour and that’s what I would have.

Wilhelm02 · March 31, 2021, 9:44pm

Hi Glenn,
Once its gone through the second BLT round after I tell it what to print and ‘tune’ it, the blue light comes on telling me its cold. As the plate and nozzle heat up it changes to almost an indigo which starts to get red as the temp goes up. Once up to temp the light goes to white signaling it’s ready to print. I leave the white light on till after the left-side-purge and the first few brim/raft/skirt lines. That way I know it’s printing evenly all-the-way-around the build area. Then I turn off the light and leave it alone.
Les

Glenn · April 1, 2021, 12:17am

That’s great. I just restarted a print that failed and forgot to try it heh. next time, I wonder where that comes from?

Wilhelm02 · April 1, 2021, 12:42am

Hi Glenn,
I have no idea. But ever since I started using Marlin and figured out the lights and how to do the manual level before the BLT - I use a business card and adjust to where I can feel the nozzle just barely making contact when I slide it around - it’s been doing fine with very nice prints. So it’s gotten a repreive from the cold and dark attic. Now I need to figure out which internal fan is making the noise and why.
Les

Wilhelm02 · May 3, 2021, 3:48pm

The B1 Poltergeist has returned and has decided to no longer Auto Home and do the initial purge line on the bedplate. Otherwise it’s printing nicely using Marlin.

Glenn · May 3, 2021, 3:56pm

Did something change your start gcode in The slicer? That’s where those instructions come from.

Wilhelm02 · May 3, 2021, 4:17pm

I’ll have to check on the next print. It was working fine last night and saw it was off the plate starting up a new print this morning.

Glenn · May 3, 2021, 4:32pm

you can open the gcode files in notepad and compare a known good one to what you have now. under the lines that say something like “; BIQU B1 Start G-code”

Wilhelm02 · May 3, 2021, 4:51pm

Thanks! I’m not up on gcodes at all so this is very helpful!

Glenn · May 3, 2021, 5:19pm

Cool. If you go to

All the codes (or most) are there and you can search each one to see what it does and how it’s used.

Wilhelm02 · May 3, 2021, 6:29pm

I will check it out, thank you!

Ted · May 7, 2021, 3:52pm

Dude. I grab mine by the top rail, throw it in the car, use it on jobsites without relevelling.
I don’t know what went wrong with yours, but this is my first machine and it is bullet proof.
Absolutely gotta have bl touch, power through the spring and gender of wire issues.

Timolude · May 7, 2021, 4:08pm

Ya man it took alot of messing around and adding ABL to get it to be reliable. It is now pretty good however all the fans have been changed. They started to die within 2 weeks and went one by one until all had been changed.

Wilhelm02 · October 26, 2021, 3:07pm

The BIQU Poltergeist has returned. Everything was pretty much working fine except there’s now suddenly no filament when when printing. Extractor was cleaned, Bowden tube replaced, new nozzle, and still nothing comes out even when doing a purge via the printer. When it’s hot I’m able to insert and push a cleaning drill up and down into the nozzle without difficulty, yet still no flow. Seems the PLA is getting blocked somewhere along the line.