How to avoid having those ugly lines and difficult to remove thin support?
Hi, I was printing a model using PETG and the coarse build plate. There is some kind of thin support that is very difficult to remove. How do I avoid having it at the first place? I don't recall having it when printed using PLA. Also, I noticed that underneath of the top surface of my model (it was empty in the middle so there were lots of support), there are lots of thin ugly lines. Is there any way to avoid having them?
RE: How to avoid having those ugly lines and difficult to remove thin support?
Photo of ugly surface
RE: How to avoid having those ugly lines and difficult to remove thin support?
My experience is that you can easily get easy to remove supports by changing the default 'contact Z distance' to something like .2 or .25.
However, I have not figured out any consistent way of getting rid of ugly bottoms over the supports.
RE: How to avoid having those ugly lines and difficult to remove thin support?
@jsw
Thanks. I already set it to 0.2mm. Why this kind of thin and difficult to remove support showed up when using PETG rather than PLA? How come PrusaSlicer does not allow the user to put more support under the model? If I recall correctly, I was able to do that on the Up Plus 2 printer.
What caused those ugly thin line underneath the roof of my model? Can we ask the printer not to print those lines?
RE: How to avoid having those ugly lines and difficult to remove thin support?
Hmmmm ... I've never had issues removing supports that were .2 and .25 in Z distance, with either PLA, PETg, or ABS.
It looks to me like those ugly thin lines are just the 'normal' first layer above the support, which will have some of the same droop as bridged lines.
One trick I remember hearing (here?) was to print the supports in PETg and the model in PLA (or v/v) and keep the very low contact Z distance, as PETg and PLA (allegedly, I have not tried) don't like to stick to each other. I have not tried that yet.
RE: How to avoid having those ugly lines and difficult to remove thin support?
Isn't that just a "raft"? Check the Support tab to see if Raft is checked. If not needed, uncheck it and reslice.
Hear ye, Hear ye! Step right up folks and get your Government salvation here! Less than $.002 per word! Amazon.com/dp/B0B8XMMFP4
RE: How to avoid having those ugly lines and difficult to remove thin support?
Isn't that just a "raft"? Check the Support tab to see if Raft is checked. If not needed, uncheck it and reslice.
Thanks. Don't know if it is raft or not. Where can I uncheck Raft? Cannot find such option.
RE: How to avoid having those ugly lines and difficult to remove thin support?
@jsw
I have no issue in removing support from the build plate but from the model. It could be raft. How to tell the differences between support and raft?
RE: How to avoid having those ugly lines and difficult to remove thin support?
@peter-c20
I described raft selection incorrectly. Just set the number of raft layers as zero (which your picture of the support options shows). As to your other "ugly" picture, I can't tell what is going on there. If that's a first layer, I'd say the live height is way too high.
Hear ye, Hear ye! Step right up folks and get your Government salvation here! Less than $.002 per word! Amazon.com/dp/B0B8XMMFP4
RE: How to avoid having those ugly lines and difficult to remove thin support?
A support does just that, supports things like overhangs and bridges.
A raft is a printed plastic base that gets the lowest layer of of print off of the build plate.
In another thread, it was suggested to use a raft to strengthen supports that were breaking away on the lower layers.
RE: How to avoid having those ugly lines and difficult to remove thin support?
I tried to use a raft but when I was removing the model from the build plate, the surface of the model got sticked to the raft so strong that it got separated from the model leaving the internal of the model visible. Is there any good way to prevent this from happening?
RE: How to avoid having those ugly lines and difficult to remove thin support?
Here is a photo of the raft so sticky that when I removed the model, the model's surface stayed with the raft. What can I do to prevent this from happening?
RE: How to avoid having those ugly lines and difficult to remove thin support?
OUCH!
RE: How to avoid having those ugly lines and difficult to remove thin support?
Hmmmm ... I've never had issues removing supports that were .2 and .25 in Z distance, with either PLA, PETg, or ABS.
Quoting my own message here because I just **DID** have trouble removing supports with .25 Z distance.
This is a 'digger', kind of alike what we would call a Bobcat here in the States, that I thought would be a cool model railroad accessory. I think I got it here, but it may have been from That Other Place. The instructions said to lay it flat and don't use supports, but on printing it showed some artifact on the bridges so I reprinted it using the preset I made from the support parameters posted earlier.
Well, after about 10 minutes futzing around to try to remove the supports, I gave up, tossed it in the scrap box, and reclaimed the original from the scrap box to use.
Those supports refused to budge! Period. I tried to get a shot of this, but it's difficult to see. Hopefully you will get the idea.
Yes, there are some cases where these support settings do not work, although most of the time they break away with using only a thumbnail as a tool.
RE: How to avoid having those ugly lines and difficult to remove thin support?
Hmmmm ... I've never had issues removing supports that were .2 and .25 in Z distance, with either PLA, PETg, or ABS.
Quoting my own message here because I just **DID** have trouble removing supports with .25 Z distance.
This is a 'digger', kind of alike what we would call a Bobcat here in the States, that I thought would be a cool model railroad accessory. I think I got it here, but it may have been from That Other Place. The instructions said to lay it flat and don't use supports, but on printing it showed some artifact on the bridges so I reprinted it using the preset I made from the support parameters posted earlier.
Well, after about 10 minutes futzing around to try to remove the supports, I gave up, tossed it in the scrap box, and reclaimed the original from the scrap box to use.
Those supports refused to budge! Period. I tried to get a shot of this, but it's difficult to see. Hopefully you will get the idea.
Yes, there are some cases where these support settings do not work, although most of the time they break away with using only a thumbnail as a tool.
Is there any way to identify such issue with high certainty before spending hours to print it and then find out at the end?