I've noticed a lot of beginners with the Ender 3 are getting blobby prints. The default nozzle temperature with the slicer and printer is 200 °C. The filament's manufacturer's suggested nozzle temperature is 215 °C. What're the best Slic3r settings to solve this?
Here are some examples. These are supposed to be shaped roughly like a human eye. After the bottom right failure I tried doubling the default retraction distance and adding glue stick to the bed, keeping the nozzle temperature at 200 °C. The bottom left print was next. There was no severe blobbing but the nozzle still seems to have dislodged the print while transitioning from infill to the next layer's perimeter. The next print was the top one, which had +1 mm Z distance for the nozzle and increased the nozzle temperature to 215 °C.
Support material options are turned off. These prints seem to go bad within the first few layers. I've tried watching the print carefully and saw that the nozzle kept bumping the perimeter during infill. I tried a print with double-sided tape, which held the print more firmly. I finished one of the double-sided tape prints. Although most of the print was fine the first three layers are extremely harsh with very different consistency from the rest of the print. Subsequent prints get to about two inches in height then consistently fail at the same height. At about two inches the nozzle side-swipes the top layer of the perimeter. This tips the model over. The results are much as seen above. I tried a smaller model and the printer made the harsh layers then started the model but failed for the same reason, though within only a few layers.