help with supports setting pls  

Please save your project as a .3mf file

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Zip the .3mf and post it here. It will contain both your part and your settings for us to diagnose.

Cheerio,

RE: help with supports setting pls

Not sure from the picture. Did it not print ANY supports? As Diem said, post the 3mf so we can see the settings. 

RE:

i tried to get the supports working on a second go, but although they at least printed the supports this time, the supports did not work well, one falling off.

RE: help with supports setting pls

This is with the second try.

RE: help with supports setting pls

I've added some pics. It looks like your brim is interfering with the support base and causing adhesion issues.. So some things you can try.

1. Clean your print sheet well with soap & water. (especially for PLA.. not alcohol) . If you want a bit more adhesion you can add a bit of glue stick in that area of the support.

2. You can move the brim inside, instead of outside

3. You can paint on the support, and you'll get a bit wider support up that steep, sharp edge.. shown in one of the pics. 

4. If you created the model, you should not have that sharp an edge, if you can prevent it.. a bit of fillet will make it stronger.. That sharp edge and the layer lines oriented this way will make the edge liable to peel off. 

5. You can add, in the slicer, a separate box under each edge. The boxes print as separate objects and so the brim goes around them and you get a better base. 

6. If you did the model you could build in support, but I'm assuming this is not an option.

I've included 3 hopper files with modified support options. Basically it looks like you have weakness in the base adhesion and the structure is a simple one width structure, which is also a bit weak. In the support options you can choose RECTILINEAR GRID and you get a denser structure as shown in upper left pic. I might move the brim inside, unless the outer dovetail needs the brim on the build plate.. don't think it should. In one option, I painted on the support and changed it to ORGANIC and it might work a bit better than SNUG in this case. Supports are a whole learning experiences. You will need to experiment and just watch the first few layers to see what works best. Maybe even create a test piece, or slice up that large piece into one tiny part to test the support under the dovetail. 

RE: help with supports setting pls

Somehow I can't edit my post.. so will add this separately.. lately this forum won't support editing for my Safari browser. I'm no support expert and so diem and others can add, likely better, support options.. I always like to use the slicer to move up and down the layers and see how it will print to see if it looks stable and strong.. Then I manually tweak the options. (I only use the expert mode of the slicer) .. not that I'm an expert.. but it gives you more control.  On this model, you can almost have the support touch the model edge, but since it is only one width... it will likely peel off.. You have 0.1 and that might be fine. Your layer height is 0.3.. so I'd recommend that 0.2 or 0.3 for the gap. But you almost need to do some tests so see what will work before committing to a large model.. You can slice up that model, get just one wall with that dovetail and shorten its height.. something that prints in less than 30 minutes.. Save/export that STL and then try various support options until you get one that is reliable with that sharp edge.

RE: help with supports setting pls

Grin.. one more.. just looked at your last pic.. see with layer lines horizontal with a thin structure, they peel off. You might need a bit more temp to get better layer adhesion.. Painting on your support on those edges causes a wider line than just the edge and you get some support along the sides as you can see in the top right and bottom left pics above. Might help. I'd add 5-10F to your PLA to see if that helps.. I use 215-217 on my MK3S+, but each printer is slightly different in their absolute temps.

RE: help with supports setting pls

Thanks for the advice. I will bump the temperature up a few c. Is this nozzle temperature? The issue doesn’t seem to be plate adhesion, but the supports are fragile. I see a setting with an angle option, I suppose I can lower that too to make the support wider in my case?

RE: help with supports setting pls

I don't know why you need a brim at all for this. 

I think the main culprit in your model is—as also pointed out by Mr Crab—the sharp overhang.

As you see in the preview, you have these three tiny lines on top of each other, which are bound to collapse. Add a fillet to the edge, and I'm sure you will be fine.

RE: help with supports setting pls

Brilliant! Thanks!

Does this have to interact with other pre-existing parts?

It's not well designed for 3D printing, it looks like something designed for metal fabrication..?

The chamfered interlocks are far too shallow an angle - for FDM a 45° angle would allow most strength on both sides.

Support will fail as designed because the first supported layer is a single strand and then many more expanding layers must balance on this before any lateral, stabilising, connection.

 Instead, change the angle of the interlock, truncate the edge so it's squared off and wide enough not to twist:

Then instead of using the programmatic supports make your own tailored support by putting a one layer thick bridge between two legs.

Then peel off the support post printing.

Cheerio,

RE: help with supports setting pls

Yea it is a hopper for hops, in my automated brewing system I built. There will be four of them attached to each other and slid on to a mounting plate to be fixed to the wall. Ops will drop into the boiler at certain times there is a lid on the top which I have designed and a trap door at the bottom which holds a solenoid the solenoid operates and the trap door drops open. I’m a newbie to 3-D printing but I have use ketchup for a long time as a hobbyist so I like to use it. I will make the changes you suggested. Thanks for your help:-)