I am trying to print a star tracker for a friend, but the accuracy of parts coming off the bed can’t be trusted. In addition, I’m switching filament from PLA+ to ABS or PETG, so I wanted to get as accurate as possible with a forgiving filament before I attempt that. I have been enjoying the Ender 3 since adding the CR Touch as detailed in the previous post. Leveling is a breeze, and I don’t have any more head crashes.But this last hurdle for print quality was really bugging me.
After troubleshooting for years to get level, I went back down the rabbit holes of forums and walkthroughs and YouTube videos. I emerged with novel Cura (5.12) settings that made my prints sharper, corners tighter, and top/bottom squish without crazy failures of tolerance. I changed one setting at a time, for the most part, and printed a new cube or partial cube, depending on what problem I was solving.
As you can see on the calibration cubes picture, there is still a little elephants foot left on the bottom, but I’m much closer to where I need to be, dimensionally, and closer to mechanical precision needed for future projects. This should give me the solid base I need for ABS as well.
Layer Dimensions & Elephant's Foot Fixes
- Initial Layer Horizontal Expansion: -0.2mm (and tested to -0.3 mm) to shrink the footprint of the first layer.
- Initial Layer Line Width: 95% / 90% to push less plastic into the base layer; more room for the squish, but can screw with adhesion.
- Top/Bottom Flow: 95% to reduce over-extrusion on the solid floor/roof layers without touching the rest of the model. Tried down to 80 which did not improve things and lead to spaghetti.
Corner Bulging & Pressure Relief
- Outer Wall Speed: Lowered to 25 to 30 mm/s to keep nozzle pressure steady as the printer slows down for turns.
- Enable Jerk Control: Checked. Also set Outer Wall Jerk set to 10mm/s; maintain clean momentum through 90-degree corners and prevent jitter and blobs
Seam Hiding & Blob Prevention
- Enable Coasting: Checked (using default values) to stop pushing filament right before a line ends, using up leftover nozzle pressure naturally instead of leaving a blob. Dramatically reduced visibility of seams.
- Outer Wall Wipe Distance: 0.3 mm to wipe the nozzle over the starting line and smooth out any seam bump.
- Retraction Speed / Prime Speed: Retraction Speed set to 45mm/s and Retraction Prime Speed lowered to 25mm/s; prevents filament from slamming back into the nozzle.
- Z Seam Alignment: Sharpest Corner and Corner Preference: Hide Seam; physically tucks the seam out of sight.
Temperature & Cooling
- Printing Temperature: Dropped down to 220°C (from 235°C) to male the PLA+ less fluid and reduce oozing pressure. This took care of almost all my blobbing.
- Build Plate Temperature: Dropped to 55°C (from 60°C) to hopefully reduce slouching.
- Regular Fan Speed at Layer: Set to Layer 2 to ensure cooling kicks on immediately after the base layer to freeze the plastic into shape.
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