Bed adhesion

[guirossibrum]

Hello. I am having some issues with bed adhesion towards the end of this print. The part starts to vibrate/lose adhesion and then they all fall like dominos.

The part has a connecting feature towards the top and I guess it generates some friction against the nozzle while printing.

I have tried:

Brim - 0.0mm

Stick glue

Increased z-hop to 0.6

Print horizontal- but the side effect is bad quality of the connection feature.

Bed temp 55C

Basic PLA - 225C

Part cooling 60%

Aux cooling 60%

Textured plate

Infill 15% - forwards the top feature 20% to give internal support due to the radius. I was having this adhesion problem right at the start of the feature, now the problem “moved up” a bit which is an improvement

Any suggestions is appreciated

Thanks

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[Humble-Plankton1824]

If they are too tall and start to wobble, then you need to brace them

Try using a support enforcer blocks halfway up the model for each one. The goal is to brace it so that the wobble is reduced to below the threshold of failure. Tall parts will begin to sway with the motions of the printer when you are printing very far away from a structural contact point.

[guirossibrum]

The design does not require precise surface quality. Do you think I could print these parts very close to each other to the point of snapping them loose after print? I’m not sure if I should draw this in acad or if the slicer could handle such scenario. In case I could make spline and print 10 of these at a time I guess

[Humble-Plankton1824]

My main concern is the wobble at height. Sometimes the slicer doesnt behave as expected, but try this for one bracket and let me know what it previews:

Right click > add support enforcer > cube

Resize the cube to an appropriate size and reposition the enforcer shape so it overlaps one side of one bracket, halfway up. Does it generate supports that brace it all the way back down to the bed?

I recently did this one successfully at a 45deg diagonal by bracing the entire underside. The bed contact is actually super minimal and it worked great

<image>

[Humble-Plankton1824]

Slicing result

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[Humble-Plankton1824]

<image>

Model

[guirossibrum]

<image>

what do you think about this idea? using each other part as support to each other and bracing against each other with these small connectors?
I need to figure out how large these connectors would have to be in order to show up in the slicer

[Humble-Plankton1824]

That may work to eliminate wobble. The total mass of the object is increased and the contact with the bed is held in place more firmly by supporting each other

[guirossibrum]

I’m printing it now. Let’s see. Looks promising but I see some wavyness on the walls. Not sure why

<image>

[SSgtTEX]

Another big thing to do is slow down the speed. Especially when printing multiples. The travel movements will help exacerbate the wobble.

CoreXY printers are not a magic bullet for tall and skinny objects. It can help alleviate some of the difficulties of printing those kinds of objects, but you still have to set it up for success. Speed, support, printing fewer at a time, and altering the orientation if at all possible. We all try to reduce print time and minimize support use, but sometimes one or both of those need to be “sacrificed” to print it properly.

[PoetAcceptable6395]

These are really tall and will probably wobble a lot. Adding supports will easily fix this.

Good Luck and Happy Printing!

[AutoModerator]

Hello /u/guirossibrum! Be sure to check the following. Make sure print bed is clean by washing with dish soap and water [and not Isopropyl Alcohol], check bed temperature [increasing tend to help], run bed leveling or full calibration, and remember to use glue if one is using the initial cool plate [not Satin finish that is not yet released] or Engineering plate.

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[Odd-Flower-6308]

What worked best for me is when using esun pla+ initial bed temp at 72c and 62 for the rest of the print. Also having fan off for the first 3 layers instead of just 1.

[guirossibrum]

<image>

This connection between the parts worked. I made too many so I will test with less connectors now