Over the last week or so, I’ve started with having issues with PLA shrinking on certain parts of a large model. I tried again with the same result. A third time was so bad that the PLA lifted from the bed and caused the front cover of the head to be dislodged!
I then tried with PETG with exact same issues, including dislodging the front head cover.
I’ve lost faith with the machine and simply can’t sit and watch it print in case of errors and failures again.
I have tried both Prusament PLA and PETG on the Bambu Cool Plate Supertack which is always cleaned with IPA.
No filament calibration or at least check the defaults work as advertised?
PLA should not shrink much…
Is the issue here really the machine or the operator being new to all this ?
Why mess with special plates - does the textured PEI plate work better?
start the right way by calibrating and by cleaning the plate with soapy water THEN IPA.
If it still won’t stick use the gluestick so you can calibrate the filament and once it is the problems should disappear…
I am also new to the community and from what I have noticed when and if that happens, there is usually a coloration to the humidity, or lack of heating on the plate. Is there one specific area that is more prone, i.e. the front or the rear of the plate.
Have you gotten your humidity as low as you can, how are the materials stored etc. Moisture has a lot to do with not only the quality, but how materials react to the process of print.
Here is a link to the model I’ve been trying to print first of all:-
It was the 5 x 4 x 6 derivative. I’ve tried printing the base and the lid. The base finished but was badly warped on one corner. The lid I’ve tried printing twice, once in PLA the other with PETG. I’ve used the default temps for everything that Bambu Studio suggests for Generic PLA and Generic PETG.
The room where the printer is located is part of our living room so ambient temperature is probably around 20 degrees Celsius.
My AMS reports total humidity of 10%. I use printed silica gel units installed at the front of the AMS.
I should add, that the first few layers stick without issue on both PLA and PETG it was only when around 15 layers of the 161 that printed did it warp badly and corners lifted which caused it to trap and flip the front tool head cover off.
When the printed part cool down too much, it shrinks more and pulls the corner off build plate.
First of all, try bed temp 60°C for PLA and 80°C for PETG, just a bit above crystalization temp of PLA and PETG. That should keep a few bottom layers warm enough so the shrinkage is minimum while printing.
Room temp 20°C is a bit low, Autumn in Sydney here is about the same. Try close the front door and top glass cover or turn down cooling (part fan and aux fan). You can buy a mini thermometer like mine to monitor the temperature inside the chamber, so that you can manually control the temperature a bit by closing front door or closing top cover.
If you see the temp gets a bit high above ~40°C chamber for PLA or ~50°C for PETG (while with door/top cover closed), it is in danger zone of extruder clog. The temp of extruder could be around chamber temp + 20°C. Try to manage filament temp inside extruder below softening temp to prevent extruder clog.
It’s best to have the printing part temperature closely to the crystalization point (while printing), but it’s hard or nearly impossible to do so especially for those engineering plastics.
I have a similar issue on my P1P. I have resorted to adding supports around the base on a print that deforms. It usually happens on small areas like chamfers or rounded bottom edges. Also use Vision Miner Nano Polymer Adhesive for extra stick down force.
