What am I doing wrong

[Ambrose_A]

I keep getting these gaps/empty areas in the backside of my prints, the curves in the front of the hooks are rough too.

 

I know it's not humidity since I used brand new filament.

I've tried: slowing the print speed, upped the feed rate to 105%, adding several more  layers to the walls, rasing the bed, lowering the bed, rasing the tool temp.

 

I'm using a ender 3 pro with a 0.6mm steel nozzle and PLA+.

I've never had this happen before and I've been trying to fix this issue for over a month!

[Ambrose_A]

anyone have any ideas?

[ndesign.ie]

Pla+ is getting too cold too quick

you either need higher bed temp or case for the printer

 

Also looks like the flow rate is a bit high, too much extruding, lower feed speed, increase tip temp

 

see how that works, my one is a cobbled Prussia i3MK2 with really old controller(v1 board)

[Ambrose_A]

11 hours ago, ndesign.ie said:

Pla+ is getting too cold too quick

you either need higher bed temp or case for the printer

 

Also looks like the flow rate is a bit high, too much extruding, lower feed speed, increase tip temp

 

see how that works, my one is a cobbled Prussia i3MK2 with really old controller(v1 board)

Upped temp of tool to 220c and bed to 60c.

It still didn't come out. It always messes up in the back side of the bed.

[ndesign.ie]

8 hours ago, Ambrose_A said:

Upped temp of tool to 220c and bed to 60c.

It still didn't come out. It always messes up in the back side of the bed.

Any chance you can show the print bed after print?

Also bridge print speed could be increased, really need to see it just after print.

Is there a draft in behind the printer?

Have you tried using support?

[Ambrose_A]

10 hours ago, ndesign.ie said:

Any chance you can show the print bed after print?

Also bridge print speed could be increased, really need to see it just after print.

Is there a draft in behind the printer?

Have you tried using support?

the slicer put supports under the hooks and when printed they looked fine to me.

The left of the printer is a window. The window is double paned and the blinds are pretty much always closed. I tend to keep the door to the room closed.

I've had the printer there for several months and never had an issue like this before.

 

The screenshot is my printer from my Ocotoprint's point of view (I need to place the camera better). The edge of the window is a couple inches closer to the camera then the print head and just off screen like 2-3 inches to the left.

The backside of the print is the part that is furthest and to the right (where the hooks are pointing to)

This is the best picture I can do today, I'll leave the print in place and try to take more tomorrow.

[ColinLTT]

Post your print speed, extruder temp, bed temp, and even better if using Prusaslicer or otherwise, an export of your slicer build plate w/settings. 

[ndesign.ie]

theres is most definitly, a draft.

 

Colin has the know how and yes please post the settings.

Print movement speeds(Bridges, gap fill, infill(s)), perimeters, solid shell layers/thickness,  extrusion widths flow rate bridging(different to speeds), etc

[Ambrose_A]

19 hours ago, ColinLTT said:

Post your print speed, extruder temp, bed temp, and even better if using Prusaslicer or otherwise, an export of your slicer build plate w/settings. 

tool 220c

bed 70c

speed I think is 150

I'm using Ultimaker cura (can't beat the price of free)

 

I've attached the .3mf and gcode. I don't know if the 3mf was what you were looking for.

 

I'll try moving the printer somewhere else to see if that helps.

key_hookb.3mf key_hook.gcode

[Ambrose_A]

8 hours ago, ndesign.ie said:

theres is most definitly, a draft.

 

Colin has the know how and yes please post the settings.

Print movement speeds(Bridges, gap fill, infill(s)), perimeters, solid shell layers/thickness,  extrusion widths flow rate bridging(different to speeds), etc

Moving the printer helped a bit but it's still messing up.

[ndesign.ie]

On closer inspection, the print nozzle looks like main culprit.

That inconsistent pattern may be due to contaminate in filiment feeder possibly Z axis/feeder skipping/misalignment or both.

to be sure, place the printer in a box, try open topped first and repeat print.

reduce fiiment flow a small step, change the pattern of support material. Oil the Axis bars/rollers.

 

[Ambrose_A]

On 5/22/2021 at 7:53 AM, ndesign.ie said:

On closer inspection, the print nozzle looks like main culprit.

That inconsistent pattern may be due to contaminate in filiment feeder possibly Z axis/feeder skipping/misalignment or both.

to be sure, place the printer in a box, try open topped first and repeat print.

reduce fiiment flow a small step, change the pattern of support material. Oil the Axis bars/rollers.

 

I added a little lube to the Z axis screw and the wheels just to make sure that they would move freely, the lube was made for mechanical watches.

I'm a little wary of enclosing the printer with just anything due to the heat, but I've been wanting to build a cabinet for it, maybe when I've saved up I'll build a proper one.

I'll try the change in flow and support patterns.

[ndesign.ie]

Dont worry about the heat build up in an open topped box, it just creates a more stable air circulation and near constant temp around the bed, cardboard box for testing is ideal.