Printing reprap parts/ help with delamination January 05, 2016 10:31AM |
Registered: 11 years ago Posts: 114 |
Re: Printing reprap parts/ help with delamination January 05, 2016 10:44AM |
Registered: 12 years ago Posts: 2,470 |
Re: Printing reprap parts/ help with delamination January 05, 2016 12:56PM |
Registered: 11 years ago Posts: 114 |
Re: Printing reprap parts/ help with delamination January 05, 2016 01:33PM |
Registered: 10 years ago Posts: 14,672 |
Re: Printing reprap parts/ help with delamination January 05, 2016 02:12PM |
Registered: 10 years ago Posts: 580 |
Re: Printing reprap parts/ help with delamination January 05, 2016 02:31PM |
Registered: 11 years ago Posts: 114 |
Quote
dc42
You need to enclose your printer in order to print ABS prints more than a few mm high, to increase the temperature of the air around the print and protect it from draughts. You don't necessarily need active heating of the chamber, the heat from the bed may be enough. I have a delta printer, and putting two plastic bags over it was enough for me to get good ABS prints.
Keep the electronics out of the warm chamber. Also make sure that the hot end fan is cooling only the hot end heatsink and not blowing air on the print. Check for backwash from the fan too and fit a fan inlet duct if necessary.
Alternatively, print in a less critical material such as PLA or PETG.
Re: Printing reprap parts/ help with delamination January 05, 2016 02:36PM |
Registered: 11 years ago Posts: 114 |
Quote
Paul Wanamaker
What DC42 said, and also:
What nozzle diameter, perimeter width, layer height, print speed?
These parameters, including what Shrek asked, together make a big difference in layer adhesion.
Make sure your extrusion width is > nozzle diameter x 1.05, (and less than 1.7x nozzle diameter). The wider you make the extrusion width the more it must squish onto the previous layer, making a better bond. 1.5 x nozzle diameter will be bonded much better than 1x. Printing at a lower speed will melt it into the previous layer more.
However much this might help, it won't fix the problem if you don't have some heat contained.
Don't be afraid to try a bit higher temperature, you may get more even extrusion.
There is also some perimeter offsetting from the start. You may need to lower acceleration or print speeds, tighten belts, etc. This may help.
Re: Printing reprap parts/ help with delamination January 05, 2016 04:22PM |
Registered: 10 years ago Posts: 580 |
Re: Printing reprap parts/ help with delamination January 05, 2016 11:07PM |
Registered: 10 years ago Posts: 239 |
Re: Printing reprap parts/ help with delamination January 06, 2016 09:05AM |
Registered: 11 years ago Posts: 114 |
Quote
Bill Clark
I have printed ABS as high as 280c resulting in a significant increase in layer bonding and no noticeable ill effects. Not recommending you bandaid the problem with high temps rather don't be afraid to pour some heat to it. There are a lot of other variables at play here as stated above
Re: Printing reprap parts/ help with delamination January 06, 2016 09:06AM |
Registered: 11 years ago Posts: 114 |
Quote
Paul Wanamaker
Temp is OK, you are in the range (about 135 to 160 depending on the filament). Speed is fine.
Lets concentrate on the layer adhesion issue.
Note that you are printing at just about the max sane layer height for that nozzle diameter.
.40 * .80 = .32. This is going to limit adhesion unless a wide perimeter is used.
Have you tried a lower layer height, say .20? That will also take a big load off your extruder.
Other than that, I'm not sure how Skeinforge sets perimeter width. I use Slic3r and can set the width for each kind of feature...
Have you tried printing with plastic bags over the printer? If it's cold you could even warm it up inside a bit with a hair dryer, not too hot if electronics are enclosed...
Re: Printing reprap parts/ help with delamination January 06, 2016 12:27PM |
Registered: 10 years ago Posts: 580 |
Re: Printing reprap parts/ help with delamination January 06, 2016 02:01PM |
Registered: 11 years ago Posts: 114 |
Quote
Paul Wanamaker
eried,
I wasn't recommending going to .32, was recommending smaller, like .20 and wider extrusion width.
But by all means do test!
Re: Printing reprap parts/ help with delamination January 06, 2016 08:14PM |
Registered: 10 years ago Posts: 239 |
yes, back to back tests on a part and a single extrusion width wall test piece changing only temps. These particular test pieces looked identical. I have and normally do get excellent layer adhesion at 245 on my printer though.Quote
eried
Quote
Bill Clark
I have printed ABS as high as 280c resulting in a significant increase in layer bonding and no noticeable ill effects. Not recommending you bandaid the problem with high temps rather don't be afraid to pour some heat to it. There are a lot of other variables at play here as stated above
Hey Bill, have you tested the pieces empirically or it is just a perception about they increase layer bonding? I am not sure if my extruder can reach that temperature without breaking, is a MK6 without a fan
Re: Printing reprap parts/ help with delamination January 07, 2016 03:01AM |
Registered: 8 years ago Posts: 916 |
Re: Printing reprap parts/ help with delamination January 09, 2016 10:06AM |
Registered: 11 years ago Posts: 114 |