<![CDATA[SoliForum - 3D Printing Community — Lifting]]> 2015-02-12T21:15:08Z PunBB https://www.soliforum.com/topic/9902/lifting/ <![CDATA[Re: Lifting]]> Coin wrote:

I would try these:
<snip>
95 C bed temp
<snip>

Do this first (or 100C) - from the pic your bed is clearly too hot in that spot.

]]> https://www.soliforum.com/user/6045/ 2015-02-12T21:15:08Z https://www.soliforum.com/post/84950/#p84950 <![CDATA[Re: Lifting]]> I would try these;
-turn the model 90 degrees
-place it in the middle (center) of the bed
-95 C bed temp
-level the bed using the paper technique
-use glue stick

]]> https://www.soliforum.com/user/8363/ 2015-02-12T20:55:36Z https://www.soliforum.com/post/84944/#p84944 <![CDATA[Re: Lifting]]> Since I started using mine mid last year, when I print near the back of the bed I will get lifting like that occasionally, so I keep the prints more towards the front if I can. I use ABS and the normal temps all the time.

]]> https://www.soliforum.com/user/7052/ 2015-02-12T20:00:08Z https://www.soliforum.com/post/84933/#p84933 <![CDATA[Re: Lifting]]> lachupacabra wrote:

Also, what are your settings for the first layer thickness and extrusion width?

Thicker layer height will provide more flow, and consequently more heat, making the extrusion adhere to the bed more. It also gives the benefit of giving more tolerance for the levelness of the bed. It is recommended (for slic3r) to raise the first layer height to match the diameter of the nozzle, for example, first layer height is set to 0.4mm for a 0.4mm nozzle.

With increasing the extrusion width of the first layer there is more material touching the bed and object will better adhere to it.

A value of approximately 200% is usually recommended, but note that the value is calculated from the layer height and so the value should only be set if the layer height is the highest possible. For example, if the layer height is 0.1mm, and the extrusion width is set to 200%, then the actual extruded width will only be 0.2mm, which is smaller than the nozzle. This would cause poor flow and lead to a failed print. It is therefore highly recommended to combine the high first layer height technique recommended above with this one. Setting the first layer height to 0.35mm and the first extrusion width to 200% would result in a nice fat extrusion 0.65mm wide.

And yeah, everything written above.


I am not sure I agree to that. The squish affect and spread affect of the first layers is supposed to be dictated by your bed height. That is why the auto cal function on the Da Vinci is flawed in the fact it does not know what your desired layer height is and the bed is supposed to be adjusted to half or less of that desired height for proper adhesion.

If you over fill or over extrude then you will change the dimensions of your finished product that will require more post processing. If you have vertical holes that go through the object those holes will now have a ridge that will need to be sanded down. They will be a smaller diameter on the bed side then the top side. Also the bottom perimeter will now be slightly larger and will need to be sanded down.

The reason we go through all the trouble to makes sure esteps on the extruder and the steps per mm on all the axises are zeroed in is to assure that the printed object is the same as the object that was drawn with minimal adjustments. By compensating for bad calibration with over fill and over extrusion your are just defeating the purpose of proper machine calibration.

Now of course I know you can't calibrate this machine unless you take the jump and move to Repetier firmware. So until then I guess you may need to cheat with what you have available. But if you do change firmware then you really need to take the extra steps and make sure your machine is calibrated correctly so you can print what you see.

]]> https://www.soliforum.com/user/7731/ 2015-02-12T19:41:04Z https://www.soliforum.com/post/84929/#p84929 <![CDATA[Re: Lifting]]> Looks like your first layers shrunk.  This means your heat bed is too hot.  Drop the bed temp to 100C.

]]> https://www.soliforum.com/user/6045/ 2015-02-12T18:00:00Z https://www.soliforum.com/post/84912/#p84912 <![CDATA[Re: Lifting]]> Also, what are your settings for the first layer thickness and extrusion width?

Thicker layer height will provide more flow, and consequently more heat, making the extrusion adhere to the bed more. It also gives the benefit of giving more tolerance for the levelness of the bed. It is recommended (for slic3r) to raise the first layer height to match the diameter of the nozzle, for example, first layer height is set to 0.4mm for a 0.4mm nozzle.

With increasing the extrusion width of the first layer there is more material touching the bed and object will better adhere to it.

A value of approximately 200% is usually recommended, but note that the value is calculated from the layer height and so the value should only be set if the layer height is the highest possible. For example, if the layer height is 0.1mm, and the extrusion width is set to 200%, then the actual extruded width will only be 0.2mm, which is smaller than the nozzle. This would cause poor flow and lead to a failed print. It is therefore highly recommended to combine the high first layer height technique recommended above with this one. Setting the first layer height to 0.35mm and the first extrusion width to 200% would result in a nice fat extrusion 0.65mm wide.

And yeah, everything written above.

]]> https://www.soliforum.com/user/6954/ 2015-02-12T16:11:07Z https://www.soliforum.com/post/84884/#p84884 <![CDATA[Re: Lifting]]> I don't think your first layer looks bad at all. The ABS plastic simply tends to warp a lot when cooling, specially with high infill, and this is one of the main reasons people often prefer PLA over ABS, I think. Anyway, what you need to do to fight warping is obviously increase the adherence of the extruded material to the bed, which basically comes down to:

- Good bed leveling
- Use an additional element to improve adherence, such as kapton tape or glue or ABS slurry.
- Configure the slicer software to use a brim, which will help A LOT (but I'm not sure whether the ultra-crappy XYZWare has this option? edit: nvm, I see your print has a skirt so surely you are using a different slicer already). Also the so called "mouse ears" placed on the problematic corners can be used for the same purpose.
- Increasing the bed temperature can help also, but it might bring other problems too.

]]> https://www.soliforum.com/user/6962/ 2015-02-12T14:48:35Z https://www.soliforum.com/post/84868/#p84868 <![CDATA[Re: Lifting]]> Agree with the above, 1st layer not flat enough. You need to raise the bed a fraction to get a nice squished 1st layer which will stick much better.
Forget the auto calibration, that won't get you the correct bed to nozzle height. Follow the manual method in the stickies.

]]> https://www.soliforum.com/user/6872/ 2015-02-12T11:36:35Z https://www.soliforum.com/post/84853/#p84853 <![CDATA[Re: Lifting]]> Looking at the border for the model that does not look squished at all and that would suggest your initial gap is too big.  Calibrate the bed and see if it fixes.  If not try the UHU stick.

]]> https://www.soliforum.com/user/9227/ 2015-02-12T09:25:47Z https://www.soliforum.com/post/84849/#p84849 <![CDATA[Lifting]]> I know this is common, I have read about lots of test trials etc.  I just cant get it right.  Im using hatchbox white bed at 110, head at 220. Gone up and down and around, it seems it sticks but is getting pulled up by the layers above it.and its always seems to be on the right front corner.  Im going to check bed leveling but after that im lost.  Love this forum and all the info is amazing.

Thanks in advance for any tips.

]]> https://www.soliforum.com/user/9547/ 2015-02-12T07:40:10Z https://www.soliforum.com/post/84848/#p84848