Brandon
RRCRat Rig Community [Unofficial]
•Created by Brandon on 4/7/2024 in #fix-my-print
is this underextruding?
I've fixed all my under extrusion issues now. I'm seriously about to walk out the door to go on vacation for a week to the beach, but uping the current to the extruder driver from 0.35 -> 0.4 fixed everything.
14 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 4/7/2024 in #fix-my-print
is this underextruding?
Nope. I have to slow way down in order to avoid this. 60mm/s range
14 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 4/7/2024 in #fix-my-print
is this underextruding?
14 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
I got some EM cubes printing. Between the fan speeds and the sock change I think my original failure is fixed. It wasn't due to the nozzle dragging, though it is doing that still. But I can print PETG now which is a huge improvement. Thanks!
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
Interesting. I didn't realize they were different lengths. I thought it was just a spare 🤔. I'll have to play with that
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
Yeah it's the 4028 from the kit but I'm also running the beta 2 toolhead upgrade if that makes a difference.
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
I finally got all the way through a single cube. I had to set the fan speed to min 20% and max 60%. The outside edges don't look great so I'm going to try pushing the max up to 70% and maybe setting the min back to the default of 40%. At least I can get through EM calibration now hopefully. I can still see the nozzle dragging through the top surface a bit, but I thought that was related to this failure and it doesn't seem like they are related. I guess I need to play with my zhop settings more.
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
I just tried manually turning up the fan 20 percent at a time and hitting the extrude button in klipper. It's fine up until 80% and then it slows down a lot. At 100% it barely moves and I can hear the extruder grinding slightly (hard to hear over 100% fan though).
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
So I tightened the couplers, oiled the lead screws, etc. Thought about what you said about it not being all the z motors the same and decided I'd home, z tilt, send it to z = 395, then z tilt again, rinse and repeat. Thinking I'd see one get way off but that never seemed to be the case. I heated the bed and started all over and still nothing weird. But I noticed that the PETG settings had the fan off for the first 3 layers and my big failures are happening at layer 4. Printed a cube and saw the failure at layer 4, changed the fan to not come on till layer 5 and changed nothing else. It printed all the way to layer 6 before the failure. Why would the fan coming on make the extruder stop extruding?
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
Thanks for the thought work. I'll definitely double check some of this tomorrow. I'm pretty sure I tightened them but it wouldn't hurt to verify. I might also pick up a real dial indicator gauge and rule out any human error from my measurements.
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
I slowed it way down. Down to 50mm/s and I'm still getting the same failure with petg
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
I appreciate the response. I gotta say though that 0.87 sounds super low to me but if it works I guess it works. For the PETG that is failing, I'm literally doing em patches to figure out what em to use and I can't get those to print to even know if I'm in the right ballpark. And as far as zhop is concerned, hat's the crazy thing. I have zhop turned on now.
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
I hear what you are saying and I'm not saying your wrong. Take what I'm about to say and help me understand where I might be thinking about it wrong myself.
The default speed in prusa for normal printing on a vcore, for infill is 160mm/s, and for HF its 230mm/s. The default in OrcaSlicer is 200mm/s. I also ran max volumetric flow tests on the ABS filament and my conservative flow rate for that filament is 24mm^3/s. Given a 0.4mm nozzle and a 0.2mm line height, that's a max speed of 300mm/s conservative. I'm doing 2/3rds that speed.
For the ABS print you see above that "looks" over extruded, according to Ellis' guide "The best method I have found is purely visual/tactile." for tuning EM. This top is slick to the touch. Dragging a fingernail across it, it feels smooth. One angle is harsh and yeah it looks over extruded, but it looks slick in the other direction and it is smooth to the touch. I just took a nozzle cleaning needle and pushed it point first across the top, across the grain of the layer lines and it glides across the top like's it's been sanded.
And if the ABS is overextruded and doesn't fail with the same issue the PETG is does, then overextrusion isn't the reason the PETG is failing. And none of this explains why the nozzle is contacting the print surface.
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
And here is a much higher layer but you can clearly see when the layer is done, the line made in the layer as the nozzle drags across it
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
Just for fun I switched back to ABS and printed the exact same cube with all the same settings, just changing the filament to my settings for ABS. Here's after the last layer of infill, the first layer of internal bridging going down. Much cleaner.
66 replies
RRCRat Rig Community [Unofficial]
•Created by Brandon on 3/27/2024 in #fix-my-print
nozzle hitting print
Here's where it looks like it completely stops extruding. This should be a solid layer.
66 replies