This topic contains 65 replies, has 10 voices, and was last updated by 
BHudson 3 months, 1 week ago.
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Mmm that boat is looking very bad.
Hi Luis!
At first I would decrease temperature a little bit as well as the speed.
Good luck!
Stefan
Thanks for the suggestion @sausp. This was done with the default presets just to see what results I could get straight out of the box. I also thought of reducing temperature but speed also makes sense and I hadn’t thought of that.
I’ll start a print now with half the speed before I go to work and post the results later tonight.
If anyone has suggestions for available dual models please let me know. I’m looking for interesting things to test the DM system while I wait for HIPS filament to be re-stocked at my local shop. Then the real fun will begin!
There are quite a lot of dual material tests around but none of them represent a real world problem.
The little boat has tiny bits of the 2nd material on each layer, I’ve seen 1 good print of that model although we have some a bit neater than Luis’
https://www.flickr.com/photos/3dbenchy/sets/72157656105405782 (3d benchy flikr page)
Rather than trying the most difficult (and pointless) prints first I would suggest printing with automatic support turned on and use a different material for the support. This will use the DM kit as it is intended and most useful.
As with most complex models and tests designed for 3D printing the dual material samples are designed to show flaws. Try something that you can’t do with a single material printer but that you actually want to print 🙂
Most of our work with DM is now testing various combinations of materials to see which can be used together to get the best results.
A good example of a difficult print is an electronics case which requires support for internal surfaces. Some material, like Polymaker Polysupport will peel away with no residue.
Mmm the prints of other printers are even worse. Based on what I print with single material this model doesn’t seem to hard to print.
I am printing this little boat with the current single print head for cross reference. No support just to see if it works.
Hi Luis,
Thanks for pointing me at this thread! Good to see the details of your adventure and the initial prints.
Hopefully you have more to show us soon:-) keep us posted
Regarding the version 2.00. Is this already available for general consumption? I’d love to give it a try in anticipation of my DM kit.
Regards,
Bert
@bjrhaverkamp yes you can find it here.
Yeah, @pete, the main reason I bought the DM kit is to be able to print support in a different, easily removable material (and I’m waiting for sone HIPS filamnet to areive to do that), but still, I don’t see this application as ‘pointless’ or ‘something that I wouldn’t actually want to print’. I see a lot of applications for this type of detail and material separation, and a truly capable DM machine should be able to handle this with no problem.
Still, I’m quite sure that as you finesse the profiles and settings we will be able to achieve much better results.
Let me know if there’s any way I can help in that process.
Cheers!
@microcan, I have printed the single material 3DBenchy with excellent results in the past. I’ll share some pics when I get out of work.
Hi,
thanks for sharing the link to version 2.00.1 It seems I was completely out of the loop:-) Will play with it tonight.
Bert
@pete, @luis-bustamante
I general I like the idea of a benchmark model. For this model I have to agree with Pete, do not waist any filament on this model. I downloaded the model and took a look it, and saw that this it a bad model design to print without support. To show the problems with the model I printed it with AM 1.3 and the single filament print head. Filament used is NGEN.
The model actually was a little bit better than I expected. The problems are caused by the model design NOT by the printer. On the 3DBenchy website is the following text :
The 3D model is designed to print at 1:1 scale without support materials.
The 3DBenchy model has overhang errors by design. So I like to rename it to 3DBadly ;-).
The single print head has a 0.3 mm nozzle and I printed the model at a 0.1 mm layer height. If the printer moves to the next layer (0.1 mm up) and more that the the nozzle width in the x,y direction (0.3 mm) you are printing filament in somewhere in the air and expect that is stays there. In reality gravity ruins the result, little loops of filament hanging on you overhang . Every designer for 3D print should know this. I admit that it is easy to overlook.
The maximum overhang is determined by a lot of factors:
- filament
- print temperature
- nozzle diameter
- layer height
- etc
To be on the safe side 45 degrees works in most cases. This is what the auto support generator of AutoMaker does.
Feature request
It would be nice if AutoMaker highlights the overhang errors in your model, similar to the screen dump I made from Autodesk meshmixer, if you have autosupport switched off. This will warn the user that it is printing a model that needs support material for a better result.
The algorithm is easy: (in pseudo code)
for every triangle in the mesh
compute triangle normal (cross product of edge vectors)
compute projection of normal on the gravity vector (dot product, cosine of overhang)
if overhang is larger that threshold value
highlight the triangle in red
This is probably similar to the code in the autogenerator.
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