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I've had some problems getting my prints to stay flat on the build plate and / or stick to the build plate with my Makerbot Replicator 1. I know that others have to and that solutions have been difficult to find. My solution is to create a custom slicing profile with these raft settings.
This method takes longer and uses more plastic for rafts but works consistently.
I have an updated version that works better: http://www.thingiverse.com/thing:102619
I use ReplicatorG.
In ReplicatorG go to "Edit Slicing Profiles..." in the "GCode" menu.
Select "Replicator slicing defaults" and click "Duplicate..."
Enter a name for your new profile and click "Ok"
The Skeinforge Settings window will open.
Select "Craft" and then "Raft".
Change all of your settings to match mine.
"Support Cross Hatch" is optional. Try this on or off and see which works better for the types of things you print.
When you are done changing your settings click "Save All" and close the window.
Click "Done" in the "Edit Profiles" window.
You can always edit your profile again later.
Open the file you want to print and position it on the platform.
Click "Generate GCode" and make sure that your slicing profile is selected.
Then enter your print settings.
Object infill: 8%
Layer Height: .25mm
Number of Shells: 2
Travel Feedrate: 55
Print Temperature: 225
Before you print click the "gcode" tab.
M109 S110 T0 (set HBP temperature)
M109 S115 T0 (set HBP temperature).
[T0 uses right extruder, T1 uses left extruder]
A great reference is http://wiki.bitsfrombytes.com/index.php?title=Skeinforge_Raft
Makerbot Replicator Custom Slicing Profile by emhughes is licensed under the Creative Commons - Attribution - Share Alike license.
So what's this mean?
We're sure emhughes would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!