BIQU B1 wont print, just says "Print Finished"

[JonScores 0]

Hi everyone, 

 

I'm an absolute newbie to printing; about 72 hours to be exact. Any and all advice would be extremely appreciated!

I'm getting really discouraged to be honest.

 

I'm using Cura 5.8.0, and a BIQU B1 I picked up second hand.

I am able to print files I've download from Thingiverse no problem, but when I make my own designs using Tinkercad, export the STL, then slice and export it in Cura my printer takes a VERY long time to read the file from the SD Card, and then wont even begin the print process!

 

It goes straight from loading the file to saying "Print Finished!" without anything happening.

Attached below are the .3mf files of my design "BTCID Logo - [Not Printing].3mf and the file from thingiverse that is working. Thingiverse File -[Works] .3mf.

 

I have no idea what to do or where to start trouble shooting.

[GregValiant 1,342]

I sliced and created gcode of both those files.  I don't see any difference.  The StartUp is the same in both gcodes and then the nozzle moves to the Skirt.

Is the printer putting down the purge lines?  They are part of the StartUp gcode and should go down first thing, then the nozzle moves to the actual print.

One thing that can happen is that the SD cards can develop bad memory sectors and you can get weird things going on.  I would suggest you pull off the files you want to keep, and then re-format the SD card.  Then put your fresh sliced file on it and try again.  The way I set it up, this is a 5 hour print.  If the printer was actually reading the gcode it should take somewhere near 5 hours and the printer should be moving even if it isn't' extruding for some reason.  My guess would be that the gcode on the SD card is incomplete.

 

The BTCID model is a tough one.  I altered some of your settings and created the attached project file.  It would not surprise me if you had to print it a couple of times to get a good one.  The supports are tricky.

Remember that this project is MY idea of how it should be set up.  It's your printer and project so take do care.  This is not a "Ya gotta do it this way" thing.  "It's more like a guideline than a rule" - Capt Barbossa.

One thing for sure, your Print Temperature of 180 is really low.  For PLA that would typically be 200 - 215.  That's a big difference and the layer adhesion will be much better when printing hotter.

GV_BTCID Logo.3mf

This is a tough print to remove supports from.  In particular the "dots" over the "I"'s look to be darn easy to break off during support removal.

 

[ahoeben 1,985]

Looks like this would print much better "face down" (ie rotated by 90 degrees so the extrusion lays flat on the build plate)

[Slashee_the_Cow 410]

18 hours ago, ahoeben said:

Looks like this would print much better "face down" (ie rotated by 90 degrees so the extrusion lays flat on the build plate)

Seconded. Then about the only parts that would need support are the bits that hold up the dots over the "i"s and the connections between the letters:

 

Although there's a simple reason that you'd need to print it standing up:

Since those last three letters aren't actually connected to anything it needs some support to actually stay in place 😄

 

Though even if when you fixed that, personally I wouldn't even try printing this in PLA.

Those are all the points where it's reliant on a small connection (not only thin, but not the whole depth of the letter, so it's only supported at the back to hold up the weight of the rest of the word, with the centre of weight well in front of the centre of connection.

#1 probably isn't too bad. #2 is a disaster waiting to happen. That's a connection ~2.4mm wide and ~0.4mm high (and 10mm deep with ~8mm in front of it). Even if you could remove the supports without destroying it (even if you laid it face down these parts need support) it's just going to be too weak to hold the weight.

(Cue someone successfully printing one just to prove me wrong)

 

Even PETG I doubt connections that thin are going to have enough give to hold up the weight without snapping.

My favourite material (TPU!) could probably pull it off, but even printed solid (which is a more solid than most people think when they think TPU) that could just be because it is flexible enough that the middle and end of the word end up resting on the base.