Mini+ pushing printsheet away?!
Hi guys,
I'm desperate. As you can see my print sheet has been pushed away and I don't know the cause. As a result the Mini keeps printing the object with an off set. I don't know why the nozzle is stuck. Because the printer is in the basement and I don't have a camera installed I really don't see whats going on.
Things I've done:
- recently changed the hotend, heatbreak thermistor and heat cartridge
- new setup of the pinda sensor(as shown in the manual of prusa)
- did the zero off set of the print sheet (first layer looks great, even the print does look great until this happens)
- firmware update
- checked and setup the idler screw as shown in prusas manual
- cleaned the sheet with water and soap
- used the bgcode as attached
- it occurs whatever filament I'm using. currently PETG, but does also happen when using PLA
Used stock Generic PETG settings in Prusa slicer. The printer is in a housing with HEPA Filter fan(tukkari). I don't "feel" that there is any air flowing from the fan towards the print/nozzle.
Maybe someone has an idea because I'm done.. Very unsatisfying so far. What I don't know or didn't check if there are any faults in the X, Y and Z axis hardware components.
Thanks and best regards
Dennis
RE: Mini+ pushing printsheet away?!
>Because the printer is in the basement...
What's the ambient temperature inside the enclosure?
What kind of infill is this?
I had an issue with grid infill so I switched to rectilinear.
The issue was that if the ambient temperature was too low then the big prints were warping and this caused print head to hit the infill, but the print was so well attached to the bed that the whole bed with printed element moved to the side (about 5mm) until the nozzle slipped over and was released.
With your changes it may also be a corrupted pendrive because shifts are massive.
Other ideas, print one item at a time.
See my GitHub and printables.com for some 3d stuff that you may like.
RE: Mini+ pushing printsheet away?!
Hi! Temperature is actually ~18°C within my enclosure.
It's the grid infill pattern.
To prevent warping I already added brims to my petg prints. What you describe sounds logical to me, so definitely worth looking at.
I noticed something in a print today with PLA: Despite the print was sucessfull I found drips of melted filament on the nozzle and around the heatblock. I was sure that after the last incident I cleaned everything - so after a sucessfull print you might suggest that there shouldn't be anything wrong around the heatblock.
I pushed a bit on the hot heatblock and noticed that it would turn - but only turn and not move up or down. So I disassemblied everything again and noticed that the heatbreak wasn't all in and more or less lose inside the heatblock(Don't know how this happened to me).
I fixed it and now a print is running. Curious how it will turn out and if there will be drips of filament around everything again.
After that I'll try again with PETG.
I bought this one 4 years ago and the last two years I barely used it because we're using a MK4 and a Bambulab X1E at work for rapid prototyping. These machines are straight forward.. on the mini+ everything has to be right...
Thanks!
RE:
Yeah 18C will warp the printed part - I had a printer next to the window and cold air was causing some issues exactly like that.
You could just make sure the holes in he enclosure are really sealed so the air is not escaping and set bed to few Celsius degrees higher in the initial phase and then decrease it so it would heat up the enclosure and it should be good enough.
Instead of grid infill try rectilinear - it should give less collisions in the mid print.
The nozzle should not unscrew but unfortunately sometimes they are getting loose over time of operations due to the expansion differences especially if you have steel or more expensive nozzles - in that case I suggest checking the heater blok if the threading is okay, that stock aluminium just may be too soft for anything else than brass nozzles so it may be worth to replace it with a new one or with something better? It's quite easy to damage the threads in it if you don't use proper tools with torque control ( don't ask how I know 🙂 )
See my GitHub and printables.com for some 3d stuff that you may like.
Have you changed the nozzle recently (in printing hours)? Your pictures seem to show melted plastic running down from the top of the heatblock...
Pay particular attention to the diagrams at the bottom of this page:
https://help.prusa3d.com/article/changing-replacing-the-nozzle-mini_134235
Cheerio,