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Hi, i started the Marvin print with print temperature of 210 deg, print speed 40 mm/s, 200 microns resolution and infill of 20% using Cura. It seems that I am having trouble with the eyes and at the base. Any tips would be appreciated.

Regard

Patrik

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Do you have part cooling? I had similar problems to this, added a couple of part cooling fans and slowed down non print moves to about 30mm/s. You could also try printing more than one Marvin at once, allowing additional cooling time before the next layer is added.

Kind regards

Tom Hinkley

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Hi, thank you for the reply. Part cooling? Is that different from the normal cooling? Should i just turn up the cooling maybe? Good tip about the speed and multiple Marvin I will try that

/Patrik

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Hi Patrik, I think your hotend temp may be a little high, the PLA isn’t cooling quick enough to bridge across and it’s drooping. Try reducing it to nearer 200° and see if that makes an improvement? - also do you have a cooling fan on the print (not hotend fan) you could try pointing a desk fan at your printer to supply a cool breeze across the print (but would be better with a built in one as it would target the area just printed)

hope this helps

Simon.

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Hi Patrik!

Usually when people have trouble with the eyes and the bottom of Marvin, its because their printer has trouble with overhangs. So if I were you, I would up your cooling by AT LEAST 20-30%. And if you’re really desperate, you could even try adding more fans! You could also try turning your hot-end temperature down, to give your filament more time to cool (so it doesn’t droop). Printing more than one Marvin at a time can also help with this, as the filament waits for a longer time as the other Marvin is being printed.

I hope this helps! The overhangs on Marvin might be the most challenging part on the model, and I wish you luck in conquering them!

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Thank you! I will try and aexplore that

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I will do my best =)

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Oh, those eyes. Those frigging eyes. I’ve printed dozens of marvins trying to get those eyes right.

In your case you need to lower the rate at which plastic is extruded when bridging. I’m not sure how you do this in Cura, but in Slic3r it’s the “Bridge flow ratio”. Basically you need to stretch the filament between supports when bridging. What you’re doing is squirting it out too fast.

There’s quite a range at which it will stretch nicely – at one end of the range you’ll just get a tiny bit of droop, and at the other end you get a very thin spiderweb. You’re past that range into the overextrusion side of things.

Try downloading one of the many “bridge torture test” models on thingiverse, and tune from there. Once you get bridging correct, those eyes will work a lot better.

One thing that helped me was to print marvins just from the middle of the eye upwards. This means a result in a minute or two, instead of waiting for all the feet and chin to be printed.