![Ultimaker Cura infill issues (weird vertical pillars due to underextrusion) - 3D Printing Stack Exchange Ultimaker Cura infill issues (weird vertical pillars due to underextrusion) - 3D Printing Stack Exchange](https://i.stack.imgur.com/RJPkN.jpg)
Ultimaker Cura infill issues (weird vertical pillars due to underextrusion) - 3D Printing Stack Exchange
![retraction blobs - how to minimize? - Improve your 3D prints - Ultimaker Community of 3D Printing Experts retraction blobs - how to minimize? - Improve your 3D prints - Ultimaker Community of 3D Printing Experts](https://content.invisioncic.com/ultimake/monthly_2015_07/5a330fab8505c_boxtopviews-4.jpg.0841c48209937d27705e9c823f0f0630.jpg)
retraction blobs - how to minimize? - Improve your 3D prints - Ultimaker Community of 3D Printing Experts
![What's wrong and how do I fix it? Random blobs of filament (on the same spots even on second and third attempt) and bands of what seems under extrusion. Details in comments : What's wrong and how do I fix it? Random blobs of filament (on the same spots even on second and third attempt) and bands of what seems under extrusion. Details in comments :](https://preview.redd.it/evnw8dgbr6c21.jpg?auto=webp&s=e7564d7a9580c3e01810531d5f80d32ccc64cc1f)
What's wrong and how do I fix it? Random blobs of filament (on the same spots even on second and third attempt) and bands of what seems under extrusion. Details in comments :
![retraction blobs - how to minimize? - Improve your 3D prints - Ultimaker Community of 3D Printing Experts retraction blobs - how to minimize? - Improve your 3D prints - Ultimaker Community of 3D Printing Experts](https://content.invisioncic.com/ultimake/monthly_2015_07/5a330fab09ed8_boxtopviews-2.jpg.5f14b7dbffe150505cde8c67409b10f0.jpg)