Hi,
usually, I print mechanical prototypes and functional mechanical parts, who turn out quite nicely. But as I registered my printer here, I was up to a new challenge to print a Marvin. Six attempts later, mines don’t even look as good as those of other people complaining about low quality.
I use the following setup:
Hatchbox PLA 1.75mm
- Extruder at 190 degrees Celsius
- 200 um layers
- 4 shells
- 40% infill
- (Active Cooling Fan Duct v2), Fan on max allowed current with external lab supply
- Printbed at 40 degrees Celsius
- extruding at 30mm/s
I also print a sacrificial pole at one edge of the printbed so each layer should have enough time to cool. It seems almost like the cooling is not sufficient, but at least it was enough for most other parts I’ve done so far.
So any help is appreciated, thanks.
1 Like
Here are my thoughts.
Looks a bit hot, are the covers on the machine? Get some airflow! The extrusion temp and bed seem ok. The print is fundamentally good just needs tightening up!
1. Slow down a bit more, I was printing around 1000mm/min. It will help with heat also.
2. Try 2 shells and 20 on infill.
3. Maybe make your pole a bigger print to allow more time away from Marvin.
4. Possibly a slight over extrusion.
Try one thing at a time.
3 Likes
Try to print very slow: 20-30mm/s Printspeed gives nice prints. Take a layerheight about 0.1mm. Then your print would look nice 
I think your extruder temp-, shells- and infills- settings are fine.
2 Likes
Thank you very much for your suggestions. I’ll try to beef up the cooler with a radial fan soon. For now, I just slowed the print to 20mm/s, reduced to 2 shells and print them together with some other things I wanted to print anyways for now. This gives really more than enough time to cool down between the layers and the prints turn out a lot better. The only issue I noticed is that layer adhesion is a bit worse now that I’ve optimized the settings for best optic appearance.
Good to hear progress. Marvin is a tough one!
