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Update Achemon Z offset in Marlin
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Description

We may need to include directions for setting z offset on this tool head. Some users have had issues with having to re-calibrate the z offset before printing. We may need documentation to that effect with the tool head.

EDIT - After checking the numbers, we would like the default Z offset to be set to -1.24

Event Timeline

adam created this task.Aug 3 2018, 7:32 AM
adam triaged this task as Normal priority.
adam created this object with edit policy "LulzBot Hardware Products (Project)".
adam added a comment.Aug 3 2018, 7:35 AM

@DRobertson @benmalouf did you have to change your z offset before getting good prints with the achemon?

nathan added a subscriber: nathan.Aug 3 2018, 7:47 AM

A lot of the prints that I have done so far with the Achemon have required changing the z-offset. I have found that the best way to get the best z-offset is to use a brim and change it while watching for when it sticks best to the bed. I can't remember the point where it was the best, but it was usually pretty flat as far as first layers go.

I just adjusted mine from -1.35 to -1.30 and it seems to work fine.

I did have to do some fiddling with the offset when I was using the toolhead, getting a good first layer for more simple prints like the antler model I tried was pretty easy but when I upped the ante and tried doing a more complex model with gears that are supposed to mesh getting a good first layer that was well adhered but also allowed movement of the parts was much more of a trick (I haven't actually gotten a successful print of that model yet where it was movable). In fairness though the geared model I tried is also just difficulty to print in general so I was kind of pushing it. I just checked and right now it is set to -1.10.

anolen added a comment.Aug 3 2018, 8:31 AM

I print a skirt with at least 2 lines and watch those and adjust, the ranges I have seen work best on my 4 printers are -1.10 to -1.35. Its a bit of a wide range but assuming your probe and alignment are perfect, I like to start with -1.20 average, works most of the time. While the offset shouldn't need to be adjusted every print, I do think it is important to warn the customer that the beads for these slices are really small so watching and adjusting the 1st layer is going to be the best way to guarantee a decent start.

We have had to tweak the Z-Offset a bit while printing as well. We've been using a few different colors and I've been having to change it slightly to get prints to stick to the bed. It's all been polylite PLA, but yellow in particular seems to not stick quite as well as LulzBot Green and red so I've been moving it down for yellow, then back up a bit for other colors.

adam added a comment.EditedAug 8 2018, 10:55 AM

Z offset tracking:
Bobby = -1.3 PLA and Silk
Kyle = -1.41 PLA and NinjaFlex
Dani = -1.27 nGen
Adam = -1.25 PETg (IC3D)

adam added a comment.EditedAug 8 2018, 10:59 AM

Dave = -1.2 PLA

adam added a comment.EditedAug 8 2018, 11:26 AM

Nathan = -1.13 PLA

adam added a comment.Aug 8 2018, 12:39 PM

Josef = -1.2

karrad added a subscriber: karrad.Aug 8 2018, 1:37 PM
adam added a comment.Aug 17 2018, 8:41 AM

@karrad average of all reported Z offsets is -1.239

karrad reassigned this task from adam to marcio.Aug 17 2018, 8:43 AM
karrad raised the priority of this task from Normal to High.
karrad updated the task description. (Show Details)
karrad added a project: Marlin.
karrad renamed this task from Achemon Z Offset Change to Update Achemon Z offset in Marlin.
karrad moved this task from Backlog to Next Release on the Marlin board.
karrad closed this task as Resolved.Aug 21 2018, 11:27 AM