Overhanging corners drooping/one corner rising
I'm trying to print an object where there are two parts that expand a bit after the first layers, then slowly rise and meet.
I'm having two problems. One is that the edges (especially corners) seem to want to sag. The larger problem is that there's a corner on each piece (and on in particular) that actually rises too much, and eventually it gets built up so much that the extruder hits the built up part and pulls the piece off.
I've been trying to mess with the live-z settings, as well as the extruder/bed temperatures (starting at 205/210215,50/60), but I'm just not having much luck.
Any suggestions?
Re: Overhanging corners drooping/one corner rising
Classic overhang problem- it takes experience and understanding of your printer to be able to do stuff like this.
1) Overhangs can be tough- they require excellent cooling- something the MK3 doesn't really have. Can be done, but requires a lot of finesse.
2) Make sure your fan is on full blast, and print slower throughout this part of the print.
3) Get that bed cooled down after the first layer- turn it off if you have to. Any heat you can get rid of will help.
4) Because of #3 above, make sure bed is uber clean and use a healthy brim to help hold the parts down.
5) Turn your extruder temps down another 5 degrees. It can do it if you print slowish. Maybe even yet another 5 degrees if it is still extruding ok.
6) Pray
Re: Overhanging corners drooping/one corner rising
With your temp, i guess you use pla. I think my pla don't rise that much even on tricky overhang. It is more an issue i could have with petg or abs. What is your filament brand?
You may also turn 90° your part for the part to be cold from a different angle. Perhaps the rise would be lower.
Re: Overhanging corners drooping/one corner rising
Classic overhang problem- it takes experience and understanding of your printer to be able to do stuff like this.
1) Overhangs can be tough- they require excellent cooling- something the MK3 doesn't really have. Can be done, but requires a lot of finesse.
2) Make sure your fan is on full blast, and print slower throughout this part of the print.
3) Get that bed cooled down after the first layer- turn it off if you have to. Any heat you can get rid of will help.
4) Because of #3 above, make sure bed is uber clean and use a healthy brim to help hold the parts down.
5) Turn your extruder temps down another 5 degrees. It can do it if you print slowish. Maybe even yet another 5 degrees if it is still extruding ok.
6) Pray
Reid, thanks for these pointers. How much of this can be done in Slic3r PE? I think I have a lead on slowing down the print speed and E temp. For the bed temp, can't quite grok if that knob is available or not to turn.
Re: Overhanging corners drooping/one corner rising
I don't use Slic3R, so I can't say- but I'm sure there are settings that allow you to modify your extruder or bed temp at any layer. That's what I do in Simplify3d.
Barring that, you can change the extruder or bed temp via the 'Tune' menu during a print.
Re: Overhanging corners drooping/one corner rising
Reid, thanks for these pointers. How much of this can be done in Slic3r PE? I think I have a lead on slowing down the print speed and E temp. For the bed temp, can't quite grok if that knob is available or not to turn.
I don't remember exactly what per-layer tweaks that Slic3r PE allows you to do (and my laptop isn't with me) but it does have an option to detect bridging ("Detect Bridging Parameters" under Print Settings, I believe--sounds like you might have already found it, but better safe than sorry :)) that will cause automatically detect bridges and overhangs and automatically slow the print down accordingly. I believe it defaults to 30mm/s for bridges in the PLA profile. I'm not sure why it's not enabled by default--it doesn't really add all that much time to the slicing process.
RE: Overhanging corners drooping/one corner rising
I had this problem as well. Finally I figured out that there was a seam at this point in the print. I change that to random in the slicer and it fixed the problem.