Printing a tall thin object that 'vibrates' - Possible slice settings
I have printed the following object:-
The filament is Prusa's PETG for PPE.
The thin stem is about 5 mm in width, and its length about 90 mm.
The slicer setting were pretty much default. 0.15 mm QUALITY MK3. Prusament PETG. 15% infill.
As the print got part way up the stem, I thought to myself "Oh dear, it's starting to vibrate, I didn't realize that would happen". Anyway I let it continue to print to see what the outcome would be. It finished the print and the printed object will be 'fit for purpose'. However, as you can imagine, the upper handle part is rather rough, with 'layer issues' presumably to do with vibration. I can't remember exactly now, but I seem to recall that the print head movement was circular for a while, and then a 'sudden transverse movement' that caused the vibration, this then repeated.
My question is what could I do to the slicer settings to reduce the problem at print time ?
RE: Printing a tall thin object that 'vibrates' - Possible slice settings
The issue I have found is related to Y axis acceleration of a moving bed.
- You can reduce the default XY axis acceleration in the slicer though this actually does more than you need since X axis acceleration is not producing the effect you want improved and will unnecessarily slow your print.
- You can embed a manual M201 in your G code starting or layer scripts.
- Or as I have done, set the Y axis acceleration on the printer itself (though I use custom firmware on a Wanhao I3plus and this may not be available in your printer).
In any case you will need to experiment to see what reduction is necessary. For reference I have set mine to 1500mm/s2 for X axis and 150mm/s2 for Y axis on extremely tall/narrow prints like yours. This is likely overkill but it works for me and I am more interested in quality than fast unsatisfactory prints.
RE: Printing a tall thin object that 'vibrates' - Possible slice settings
Slow the speed down.
Try different infill, some have higher lines crossing, and hitting the lines.
Use z-hop?
You could if your print is a little high, pause the print, glue a few sticks to the print and to the bed, so it is more stable.
Second problem could be, you are printing a small top object, it could be possible that it gets to hot at the top, there is no time to cool down, filament melts to much, print more then 1 object, to let the top cool down, before next layer.
RE: Printing a tall thin object that 'vibrates' - Possible slice settings
With petg being a pretty flexible material you can basically go really really slow or my preferred option would be to add 3-4 triangular breakaway supports into the model to stop the thin stem from flexing. If you make them 0.46 thick (basically just over your single wall thickness setting) then they should be fairly easy to remove with a sharp blade.
RE: Printing a tall thin object that 'vibrates' - Possible slice settings
@shane-d-finn
Thanks for that, useful information.
RE: Printing a tall thin object that 'vibrates' - Possible slice settings
@peter-m26
Thanks for the information
RE: Printing a tall thin object that 'vibrates' - Possible slice settings
@neophyl
Thanks