PianoPrint! +Rep for this thread! I hope to be able to add some more knowledge when possible.
Im still tuning my gCreate to output a good quality for me. I've been into 3D printing since 2010, at first the powder typ printers from zCorp, and the last year I've been printing 24/7 with two Prusa i3 MK2 (BETA - testing the multi color upgrade on one of them), so I see myself as experienced with 3D printing, although there are four things with the gCreate gMax that I'm still struggling with, I would be extremely happy if you could give your short view on this matters.
1. First layer / Start of print
On the prusa my process are: Slicing with 80-100% first layer height for 0.2mm layers
When the printer starts i turn down the speed, and use a Live Adjust Z feature which gives me the possibility to change the Z offset, to get a good squeeze for PLA (or less squeeze for flexible filaments for example). When its set I can print prints after prints since the Live Z adjust is stored. If I switch filament type I might need to slightly adjust it.
When I got the gCreate I downloaded the profiles and I was chocked by the first layer settings in S3D, extreme over extrusion! The first tests looked like a mess honestly. I understood after contact with the support that it's a way to handle un-flat spots in the acrylic plate which is the default plate, so I started to tune the settings closer to what I'm used to.
I always need to adjust the Z offset with babystep Z at the start of the print, even though Im at 100-150% first layer height. Otherwise it will pretty much drag the nozzle. Also I still think the first layer is crazy over-extruded I'm not even close to the perfect, smooth first layer that the Prusa achieves. Also having some issues from time to time with adhesion, and if I print an object that covers either front-back or left-right side of the bed, it can be too squeezed in the front and not sticking in the back. Sometimes not sticking in the center, but squeezed in the back/front. Havnt been able to reproduce this, I'm just moving the print around, restart, adjust Babystep Z until I get a complete first layer.
I think I might need to lower my BLTouch just a bit (half of a turn on each screw?), so I will probably do that as the next step. I will also calibrate the extruder to see how off I am. I've settled on the Colorfabb Economy PLA and Colorfabb NGEN for 80% of my prints, so I'll calibrate for both of those.
If you have any other idea or tip regarding the first layer please let me know!
2. Surface finish
I cant say that I'm satisfied with the surface finish of the prints, it doesnt matter if I print at 0.2mm layers or 0.38mm layers, i see a lot of horizontal lines, ringing/ghosting etc. Attaching example image (0.2mm layers, speed 30mm/s)
I have adjusted my Z axis (had to loosen the bolts holding the X axis parts that connects the X axis to the Z rods to be able to move it all the way up without skipping) and X axis (had too adjust the eccentric bolts a bit to get a smooth X movement.) And I'm printing slow in general.
I'm printing a lot of 3D hubs orders, and I cannot use the gMax for that yet because of the poor surface finish I'm getting.
Groot printed with 0.36mm layers, the first image 0.2mm4. Nozzle drag / Vertical Lift not working?
Especially during the first layers I'm experiencing some heavy nozzle drag when the nozzle moves from one side to the other (typical retraction moves to me), but it seems like the Vertical Lift doesn't work like I'm used to. This problem is enhanced by the over extruded first layer but the nozzle does not lift when it should (imho). I've tried Vertical lift from 0.5mm to 2mm without any noticable difference. After about one month of printing, and many prints I've seen a Vertical lift ONCE, after finishing some supports, but that's the only time I've actually seen it. All I hear from the printer is the nozzle scraping when doing retraction moves. This brings us to the next issue:4. Layer shift / bad surface taller objects
I bought this printer mainly to print 500mm tall objects in a race car project I'm involved in, I've done some tests with the standing minigroot model and some other models, and at around 430-450 mm Z height I always get a massive layer shift. It looks like the nozzle crashes into the print because of lacking Vertical Lift. And the print moves/vibrates as well from the Y axis movements. Is it recommended to turn down the acceleration for the Y axis to get a more smooth movement? Thats the only thing I can think about, I'm NOT printing fast.. the last fail I turned the speed down to about 20mm/s just to be sure, took like 10 hours to finish 20cm of the model before it failed. If I dont get layer shifts, I get some heavy lines on the outside, like the outer outline misses the line pretty much (se photos).UPDATE:
Just checked my extruder, and it extruded 93mm when I sent the command to extrude 100mm, so I'm under extruding according to that, which is the opposite of what I was hoping for
Old steps 96, so my new steps is 102.7, trying to update it through OctoPrint terminal but it doesn't bite...Where do I find the configuration.h file?UPDATE 2:
Trying to print a 350mm x 20mm x10 mm long part now, tried to both print it on the left side of the bed along the Y axis and on the front side of the bed along X axis, but I have to adjust Babystep Z in a way that the one side is almost skipping since the nozzle is too close, to get the other side ok. And even then it warps...
My front left corner is aparently lower / leaning down. Shouldnt the Probing deal with that?
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