Poor print quality of gears October 26, 2017 09:41AM |
Registered: 6 years ago Posts: 15 |
Re: Poor print quality of gears October 26, 2017 01:47PM |
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Re: Poor print quality of gears October 26, 2017 06:08PM |
Registered: 7 years ago Posts: 619 |
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blueskiesresearch
Hi all,
I've been trying to print some gears with a new Reprap Prusa i3 printer. The nozzle orifice diameter is 0.4mm. The print quality is really bad - the gears don't mesh at all.
I am new to 3d printing so can anyone advise if I should be able to print working gears with my setup and if so, where to start improving the quality of my prints?
Attached are photos of the gears I printed, and the .stl file in case anyone wants to try doing it themselves.
Thanks.
Re: Poor print quality of gears October 29, 2017 04:34AM |
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Re: Poor print quality of gears October 29, 2017 08:08PM |
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Re: Poor print quality of gears October 29, 2017 10:25PM |
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Re: Poor print quality of gears October 31, 2017 08:37AM |
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Re: Poor print quality of gears October 31, 2017 10:47AM |
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Re: Poor print quality of gears October 31, 2017 02:01PM |
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Re: Poor print quality of gears October 31, 2017 02:02PM |
Registered: 7 years ago Posts: 619 |
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blueskiesresearch
Here's my second attempt. I've stopped using hairspray and instead am using high temperature tape on the glass bed.
Adhesion to the tape was very good (as you can see the bottom surface of the cube is green - some tape was stripped off while peeling off the cube from it)
Nevertheless there is still a visible slant to the cube.
I am not an expert so perhaps others can comment whether the print quality is up to your expectations.
Re: Poor print quality of gears November 01, 2017 06:32AM |
Registered: 6 years ago Posts: 15 |
Re: Poor print quality of gears November 01, 2017 06:39AM |
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Re: Poor print quality of gears November 01, 2017 07:15AM |
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Re: Poor print quality of gears November 01, 2017 07:19AM |
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Re: Poor print quality of gears November 01, 2017 09:45AM |
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Re: Poor print quality of gears November 01, 2017 11:52AM |
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Re: Poor print quality of gears November 01, 2017 11:41PM |
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Re: Poor print quality of gears November 02, 2017 12:40PM |
Registered: 7 years ago Posts: 619 |
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blueskiesresearch
Here's another attempt at printing. The quality is a bit better. Extruder temperature set at 175C, bed temperature set at 53C.
At room temperature after the printer has reached thermal equilibrium, the extruder reports 16C, the bed reports 26C. The truth is probably somewhere in between!
Re: Poor print quality of gears November 05, 2017 02:57AM |
Registered: 6 years ago Posts: 15 |
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SteveRoy
Printing PLA you need a part cooling fan - D9 on the RAMPs board
Under slic3r "Filament Settings", "Cooling" check the box for auto cooling
You can read the bed temp with one of these:
[www.amazon.com]
It won't read the nozzle temp though - something to do with the way it reflects the infrared?
I still think you need to re-calibrate the printer:
Is the frame rigid and square?
Are the smooth rods straight?
Are the belts tight and the axis run smoothly?
Have you adjusted the drivers properly with a voltmeter?
Does the "extrude 100mm of filament" test extrude 100mm of filament?
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Trakyan
Out of curiosity, something I'm seeing on the gear teeth and the cube, are they skewed or is it just me/camera angle? Also, I agree about comments about over extrusion. Your extruder seems a bit inconsistent, there is a lot of plastic laid down there but I swear I'm seeing some missed lines as well. Is the spool catching anywhere or jerking at the extruder? I've noticed this can happen on direct drive i3 designs as the x carriage moves left to right and gets further/closer from the spool. Otherwise belt tension might be a good one to check as there seems to be some issues at corners etc where there is a direction change.
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dlc60
Quote
blueskiesresearch
Here's another attempt at printing. The quality is a bit better. Extruder temperature set at 175C, bed temperature set at 53C.
At room temperature after the printer has reached thermal equilibrium, the extruder reports 16C, the bed reports 26C. The truth is probably somewhere in between!
What is your room temperature?
You say the head reads 16C and the bed 26C. Not good.
If your room is 22-26C then your head thermistor is reading low and you are overheating your filament. Drop that temperature down, or better yet, experiment with other thermistor settings until you find the one that gives the closest reading to the actual room temperature. Then do a PID calibration on the head and put those values into your firmware. Google to find the PID autotune for your firmware. Marlin is easy, dunno about repetier or others.
Experiment with your thermistor setting on your bed after removing the resistor you installed. Find the one that works best, test some temperatures and note any offsets, use that instead of the resistor hack. You can also PID tune the bed heater.
For PLA, you don't need bed heating at all, but it does help. Set your first layer down without a fan and then start the fan in the second or third layer.
Ditch the brim on your part and use a skirt to prime the filament so you can see how your corners lay down better.
DLC
Re: Poor print quality of gears November 07, 2017 01:16AM |
Registered: 9 years ago Posts: 483 |