kent (Kent Johnson)
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User Details

User Since
Jun 9 2015, 10:48 PM (131 w, 2 d)

Recent Activity

Today

kent edited the description of T1555: Unable to use full build volume on hibiscus.
Fri, Dec 15, 10:32 AM · Cura LulzBot Edition, Mini-Hibiscus
kent created T1555: Unable to use full build volume on hibiscus.
Fri, Dec 15, 10:32 AM · Cura LulzBot Edition, Mini-Hibiscus
kent closed T1542: Print artifacts on initial cluster prints as "Resolved".
Fri, Dec 15, 8:03 AM · Mini-Hibiscus
kent added a comment to T1542: Print artifacts on initial cluster prints.

print artifact from cubic subdivision.

Fri, Dec 15, 8:03 AM · Mini-Hibiscus
kent created T1552: Early verify on cluster machines.
Fri, Dec 15, 8:02 AM · Mini-Hibiscus

Yesterday

kent added a comment to T1547: Thermal Runaway.

I'm going to change the PID values and see if that helps.

Thu, Dec 14, 12:59 PM · Mini-Hibiscus
kent created T1547: Thermal Runaway.
Thu, Dec 14, 12:58 PM · Mini-Hibiscus
kent closed T1545: Gap between blower fan output and duct input as "Resolved".
Thu, Dec 14, 12:48 PM · Mini-Hibiscus
kent added a comment to T1545: Gap between blower fan output and duct input.

We just got another set of parts, and the fitment seems to be much better on these. Closing for now.

Thu, Dec 14, 12:48 PM · Mini-Hibiscus
kent created T1545: Gap between blower fan output and duct input.
Thu, Dec 14, 10:38 AM · Mini-Hibiscus
kent added a comment to T1441: Go no go gauge concetricity.

Ok I added some dimensions and tolerances to the gauge drawing as requested.

Thu, Dec 14, 10:10 AM · Yellowfin
kent committed rYELLOWFIN8f2fa0c31adc: Added dimensions and tolerances to concentricity gauge (authored by kent).
Added dimensions and tolerances to concentricity gauge
Thu, Dec 14, 9:55 AM
kent created T1543: Recent blower fan duct changes wire routing for zero sense line.
Thu, Dec 14, 9:25 AM · Mini-Hibiscus
kent edited the description of T1542: Print artifacts on initial cluster prints.
Thu, Dec 14, 9:11 AM · Mini-Hibiscus
kent edited the description of T1542: Print artifacts on initial cluster prints.
Thu, Dec 14, 9:09 AM · Mini-Hibiscus
kent edited the description of T1542: Print artifacts on initial cluster prints.
Thu, Dec 14, 9:08 AM · Mini-Hibiscus
kent edited the description of T1542: Print artifacts on initial cluster prints.
Thu, Dec 14, 9:07 AM · Mini-Hibiscus
kent created T1542: Print artifacts on initial cluster prints.
Thu, Dec 14, 9:06 AM · Mini-Hibiscus

Wed, Dec 13

kent added a comment to T1283: Hot End PID.

@west this was with the einseyretro 0.0b that markp gave us last week. They have green PCBs.

Wed, Dec 13, 8:05 AM · Mini-Hibiscus

Tue, Dec 12

kent added a comment to T1344: Tensioner mechanism affects belt path.

@west ok thanks

Tue, Dec 12, 2:51 PM · Mini-Hibiscus
kent added a comment to T1409: Once the x-belt is pulled out completely from the tensioner block it can't be put back in without removing the toolhead.

@Baldwin ok thx

Tue, Dec 12, 2:49 PM · Mini-Hibiscus

Wed, Dec 6

kent committed rTAZOLIVE34272b48e585: Fixed typo -- "16 pin" is actually a 6 pin (authored by kent).
Fixed typo -- "16 pin" is actually a 6 pin
Wed, Dec 6, 11:50 AM
kent reopened T1328: Wall thickness near insert as "Open".
Wed, Dec 6, 7:50 AM · Yellowfin
kent added a comment to T1283: Hot End PID.

I did a M303 test with the blower on and then the blower off. Here's what I found (the pictures are uploaded in reverse chronological order).

Wed, Dec 6, 7:44 AM · Mini-Hibiscus

Tue, Dec 5

kent closed T1350: z binding as "Resolved".

Ok, I rebuilt the machine with the new parts, and it's able to travel all through it's z range without binding. I think the issue originally had to do with misaligned bearings in the motor side causing too much drag.

Tue, Dec 5, 3:55 PM · Mini-Hibiscus
kent reopened T1409: Once the x-belt is pulled out completely from the tensioner block it can't be put back in without removing the toolhead as "Open".

So I think the slice on this new model will need updated, I just had one snap off while trying to tighten the x-belt @EricNugent

Tue, Dec 5, 2:33 PM · Mini-Hibiscus
kent created T1440: Specs on drawing for large gear are not tight enough to reject gears with damaged/missing teeth..
Tue, Dec 5, 11:58 AM · Yellowfin
kent reopened T1345: z-belt tension deforms z-tops as "Open".

Hey we are still seeing this on the PETG printer that logan is working on and to some degree on the ABS machines. I think there is a way to gusset that does not interfere with the spool arm see attached image.

Tue, Dec 5, 10:17 AM · Mini-Hibiscus
kent created T1427: Overhang on z-motor mounts not forming very well.
Tue, Dec 5, 10:05 AM · Mini-Hibiscus

Mon, Dec 4

kent added a comment to T1344: Tensioner mechanism affects belt path.
In T1344#24039, @tutley wrote:

@kent ive pushed a new x belt tensioner design (8817c8a8ad0a). This deflection still happens a bit but not as much as the old design. Let me know what you think. I will have cluster print some out for you to test

Mon, Dec 4, 3:13 PM · Mini-Hibiscus

Fri, Dec 1

kent added a comment to T1283: Hot End PID.

@Steven I ran my test with the mini RAMBo, not the Einsy. I agree, we should retest when the Alphas are updated next week. Something else to keep in mind is that the values the M303 spits out will depend on ambient conditions like how much draft there is in the room. It will also be different depending on how fast the part cooling fan is running during the test, and of course it will depend on the temperature parameter entered into the M303 command.

Fri, Dec 1, 2:59 PM · Mini-Hibiscus
kent added a comment to T1344: Tensioner mechanism affects belt path.

@tutley @Baldwin Rodger that, thanks.

Fri, Dec 1, 2:53 PM · Mini-Hibiscus
kent added a comment to T1328: Wall thickness near insert.

@Baldwin yeah we might. My hope is that we would see less due to more material there to bear the tensile loads.

Fri, Dec 1, 2:51 PM · Yellowfin
kent added a comment to T1328: Wall thickness near insert.

Adding thickness to this part will require revising the body plate printed part as well. If i were to add some thickness to the walls i would like to do so all the way around the part. The body plate would interfere doing this.

Fri, Dec 1, 2:25 PM · Yellowfin
kent added a comment to T1328: Wall thickness near insert.

@kent this is less than 4% fall out. Do you still wish to make this change?

Fri, Dec 1, 1:59 PM · Yellowfin
kent added a comment to T1328: Wall thickness near insert.

@Baldwin ^^

Fri, Dec 1, 11:54 AM · Yellowfin
kent added a comment to T1328: Wall thickness near insert.

We are seeing these still. I snapped a couple photos which I think might be informative.

Fri, Dec 1, 11:45 AM · Yellowfin
kent moved T1343: Tensioner mechanism only allows discrete tensions from Product Design to Engineering Development on the Mini-Hibiscus board.
Fri, Dec 1, 11:27 AM · Mini-Hibiscus
kent added a comment to T1343: Tensioner mechanism only allows discrete tensions.

Ok I'll be interested to see what sort of values we are seeing in the testing. If we can reliably hit our target range with this system then it may not be an issue. It might be ok to widen the tolerance, but I would only want to increase it on the top side, since loose belts causes flatlining. Hopefully with the new blind hole setup we can use higher tensions without having to worry about the set screws failing under belt tension and sliding on the rods and binding things up. If we widen the tension tolerance, and do see set screw sliding, then we might consider adding a printed retaining plate on the idler side to fully constrain those rods in the x axis.

Fri, Dec 1, 11:27 AM · Mini-Hibiscus
kent added a comment to T1409: Once the x-belt is pulled out completely from the tensioner block it can't be put back in without removing the toolhead.

Here's the part by ant0ny that we just looked at for reference:

Fri, Dec 1, 11:09 AM · Mini-Hibiscus
kent moved T1344: Tensioner mechanism affects belt path from Product Design to Engineering Development on the Mini-Hibiscus board.
Fri, Dec 1, 9:08 AM · Mini-Hibiscus
kent created T1409: Once the x-belt is pulled out completely from the tensioner block it can't be put back in without removing the toolhead.
Fri, Dec 1, 9:07 AM · Mini-Hibiscus

Thu, Nov 30

kent added a comment to T1344: Tensioner mechanism affects belt path.

My concern is that having a belt not parallel with the rods will make a tiny difference in dimensional accuracy due to the difference between the length of the leg vs the length of the hypotenuse of the triangle formed by the line of the belt and the line parallel to the rod. If you ask me, this is enough of a reason to change it to make it straight.

Thu, Nov 30, 1:30 PM · Mini-Hibiscus
kent added a comment to T1350: z binding.

@Steven yes we are waiting on the new x-ends with slightly wider rod spacing and blind holes which I believe Angie is slicing today. Once we get those parts into the machine and test I will update this ticket.

Thu, Nov 30, 12:54 PM · Mini-Hibiscus
kent claimed T1386: Feeding filament.

Hey probably the easiest way to feed filament into the v3 is by cutting the filament at a 45 (liek you suggested) then put it in as far as it will go, then use your thumb and/or fingers to manually advance the large extruder gear. Once the hobb teeth bite on the filament, you should be able to let go of the filament and just feed it the rest of the way through manually with the large gear.

Thu, Nov 30, 12:42 PM · Yellowfin

Wed, Nov 29

kent added a comment to T1379: Right Z guide rods misalignment.

Hey I was looking at the FreeCAD assembly in hibiscus repo and I think the left and right sides of the sheetmetal aren't lined up in Y by 64 microns, I noticed this because the hole for the motor mount lined up exactly in the blender scene i made and not in the FreeCAD assembly. @Baldwin, can you verify this before we use it to check alignment?

Wed, Nov 29, 8:30 AM · Mini-Hibiscus

Tue, Nov 28

kent added a comment to T1371: Number of teeth engaged by belt clamp is less than manufacturer recommendation.

@Baldwin I'm not as worried about the tensile loads from the belt tension as the impulse loads that might happen in a drop in shipping. The factors are how fast the box is moving when it hits, the mass of the carriage, how much the packaging compresses, and the time between the initial impact and the full compressing. If we can get an idea of those parameters, then I think we should be add the output of that calculation to the tension to find the worst case load on the clamp.

Tue, Nov 28, 2:40 PM · Mini-Hibiscus
kent added a comment to T1350: z binding.

@tutley I did get the x-motor parts in a bit ago and I need to update a hibiscus with an einsey to give to product planning real quick, then I should be able to get the binding machine taken a part so we can take a closer look.

Tue, Nov 28, 1:31 PM · Mini-Hibiscus

Mon, Nov 27

kent added a comment to T1348: z-motor mount on left side has a fastener covered by controller.

We should not change the sheet metal. I think this too much risk for too little reward in this case.

Mon, Nov 27, 3:39 PM · Mini-Hibiscus
kent created T1371: Number of teeth engaged by belt clamp is less than manufacturer recommendation.
Mon, Nov 27, 3:08 PM · Mini-Hibiscus
kent created T1370: Belt tensioning system does not adhere to manufacturer recommendations.
Mon, Nov 27, 2:48 PM · Mini-Hibiscus
kent updated subscribers of T1346: Belts clamped at an angle.

I tried the new belt clamps, and they are better so we are making progress on addressing this issue, thanks.

Mon, Nov 27, 2:42 PM · Mini-Hibiscus
kent added a comment to T1313: X/Y Steps/mm.

If you have any other ideas for evaluation please let me know.

Mon, Nov 27, 1:13 PM · Mini-Hibiscus
kent added a comment to T1342: Set screws blocked by motor.
In T1342#22569, @west wrote:

If we did blind holes we would have to order custom smooth rods

Mon, Nov 27, 12:24 PM · Mini-Hibiscus
kent added a comment to T1348: z-motor mount on left side has a fastener covered by controller.

We could try just not putting a fastener in that hole. There are 3 other fasteners holding that part on, which might be sufficient. That said, this is not a part that needs to be replaced frequently, so we might just wait until the next rev to address this, or just deal with the fact that the controller needs to be removed anytime the z-motor mount needs to be removed.

Mon, Nov 27, 12:04 PM · Mini-Hibiscus

Wed, Nov 22

kent added a comment to T1350: z binding.

@tutley @west Yes, I am running the motors in series with the adapter. I'm seeing it on the way down near the bottom of the carriage. Here, I'll see if I can get a video (or you can engage the sneakernet and come check it out).

Wed, Nov 22, 12:52 PM · Mini-Hibiscus
kent reopened T1295: X-Carriage Cap cable pathway fitment as "Open".

@logan is working on this now again, we are still seeing issues here.

Wed, Nov 22, 12:23 PM · Mini-Hibiscus
kent added a comment to T1346: Belts clamped at an angle.

No, we can't be held accountable for what a user will do, including assembling it wrong. What we can do is do our best to make the design hard to break and easy to fix and not the other way around. It is in our best interest to make the products as serviceable as possible because this results in more up time for the user and consequently better reputation for us, not to mention, we will be doing a lot of the repair work ourselves through warranty and out of warranty repair so we should try to make it easy on ourselves. In general my experience tells me that even if a particular product is popular, if it is hard to fix correctly, it will usually have a much shorter overall service life.

Wed, Nov 22, 12:08 PM · Mini-Hibiscus
kent added a comment to T1342: Set screws blocked by motor.

wrt how much those set screws are holding, I'll have to think about it some more. There's usually some friction due to interference of the printed part and the rod that helps there too. The original issue was that those set screws are blocked by the motor, and it sounds like that's the trade-off we have to face to get the rods closer and max out the build volume. It seems worth it, but if there is another option I think it would be worth looking into, for example making those blind holes and removing the set screws. For the loads involved I don't see this being an issue, but I would be interested to test it out.

Wed, Nov 22, 11:47 AM · Mini-Hibiscus
kent added a comment to T1328: Wall thickness near insert.

I'm not sure it is 7 out of 144, it's just 7 that I know about. Like @logan said, it would be easy to miss if you were not looking for it specifically in direct light.

Wed, Nov 22, 11:22 AM · Yellowfin
kent added a comment to T1342: Set screws blocked by motor.

We are asking each of those M3 set screw in thermal inserts in a printed part to hold at least half of the tension of the belt, or about 12.5 newtons. It works, but I'm not sure if that setup has the reliability we are shooting for. We see a lot of those set screws get over tightened and pull the insert out (not in production, but on returned machines). If those set screws fail, and a certain percentage of them will, then the x-ends get torqued inwards by the x belt tension and this can put a lateral load on the z bushings increasing frictional drag and the likelihood of binding. This can also happen if a user tensions the x-belt before they tighten the set screws.

Wed, Nov 22, 9:31 AM · Mini-Hibiscus
kent updated subscribers of T1343: Tensioner mechanism only allows discrete tensions.

@tutley I know for the original mini we used 23-27 Newtons for the belts. Is this going to be the same for the z-axis on Mini 2? In one test, @logan found that he had 18 newtons on one tooth and 32 newtons on the next tooth, which puts us out of the 23-27 newton range we have used in the past. We can do some more testing to get more data if that would be useful.

Wed, Nov 22, 9:19 AM · Mini-Hibiscus
kent added a comment to T1346: Belts clamped at an angle.

@tutley Yes it is an assembly issue, but I think even assembly issues can be addressed by creating a more error-tolerant design. We can make sure they are straight from the factory, but if a user works on their own machine, we can't make sure they re-assemble it with the belts straight which makes it a serviceability issue.

Wed, Nov 22, 9:14 AM · Mini-Hibiscus
kent updated subscribers of T1347: Y-belt tension flexes stepper damper.

@west Ok, If that doesn't work out, we could try putting that motor in dual shear, though, that might reduce the effectiveness of the damper.

Wed, Nov 22, 9:05 AM · Mini-Hibiscus
kent added a comment to T1350: z binding.

Yes, I am using full height NEMA 17's part number EL-MT0029 and the EINSY controller. The firmware I have been testing with uses a variable current I think, maybe via the cool step feature of the Einsy drivers(?). It is version 1.1.5.44{F1505596}

Wed, Nov 22, 9:03 AM · Mini-Hibiscus
kent triaged T1351: z-max endstop spade connections need to be bent as "Low" priority.

Ok, this one is sounding like it will be resolved when we switch to stall guard based endstops.

Wed, Nov 22, 8:59 AM · Mini-Hibiscus
kent added a comment to T1349: Inconsistent part orientations per axis.

I'm talking about the Y idler, the Y motor mount, the Z idlers, and the Z tops, so.... 6 parts total.

Wed, Nov 22, 8:57 AM · Mini-Hibiscus
kent added a comment to T1350: z binding.

I have Hibiscus 04 here on my desk and It's binding. I've tried a few standard binding troubleshooting things without too much luck yet. There may be an issue like misalignment between the two bushings on the front left z rod, but I haven't taken it apart yet to check. I think this issue is going to crop up more with the standard NEMA 17 than the gear reduced one because they make less torque. FWIW, this machine was not binding until I switched from the gear reduced motors to the standard size.

Wed, Nov 22, 8:51 AM · Mini-Hibiscus
kent moved T1342: Set screws blocked by motor from Product Design to Report Issues Here on the Mini-Hibiscus board.
Wed, Nov 22, 8:27 AM · Mini-Hibiscus
kent moved T1343: Tensioner mechanism only allows discrete tensions from Product Design to Report Issues Here on the Mini-Hibiscus board.
Wed, Nov 22, 8:27 AM · Mini-Hibiscus
kent moved T1344: Tensioner mechanism affects belt path from Product Design to Report Issues Here on the Mini-Hibiscus board.
Wed, Nov 22, 8:27 AM · Mini-Hibiscus
kent moved T1345: z-belt tension deforms z-tops from Product Design to Report Issues Here on the Mini-Hibiscus board.
Wed, Nov 22, 8:27 AM · Mini-Hibiscus
kent moved T1346: Belts clamped at an angle from Product Design to Report Issues Here on the Mini-Hibiscus board.
Wed, Nov 22, 8:27 AM · Mini-Hibiscus
kent moved T1347: Y-belt tension flexes stepper damper from Product Design to Report Issues Here on the Mini-Hibiscus board.
Wed, Nov 22, 8:27 AM · Mini-Hibiscus
kent moved T1348: z-motor mount on left side has a fastener covered by controller from Product Design to Report Issues Here on the Mini-Hibiscus board.
Wed, Nov 22, 8:27 AM · Mini-Hibiscus
kent moved T1349: Inconsistent part orientations per axis from Product Design to Report Issues Here on the Mini-Hibiscus board.
Wed, Nov 22, 8:27 AM · Mini-Hibiscus
kent moved T1350: z binding from Product Design to Report Issues Here on the Mini-Hibiscus board.
Wed, Nov 22, 8:27 AM · Mini-Hibiscus
kent moved T1351: z-max endstop spade connections need to be bent from Product Design to Report Issues Here on the Mini-Hibiscus board.
Wed, Nov 22, 8:27 AM · Mini-Hibiscus
kent created T1351: z-max endstop spade connections need to be bent.
Wed, Nov 22, 7:44 AM · Mini-Hibiscus
kent created T1350: z binding.
Wed, Nov 22, 7:41 AM · Mini-Hibiscus
kent created T1349: Inconsistent part orientations per axis.
Wed, Nov 22, 7:39 AM · Mini-Hibiscus
kent created T1348: z-motor mount on left side has a fastener covered by controller.
Wed, Nov 22, 7:36 AM · Mini-Hibiscus
kent created T1347: Y-belt tension flexes stepper damper.
Wed, Nov 22, 7:35 AM · Mini-Hibiscus
kent created T1346: Belts clamped at an angle.
Wed, Nov 22, 7:33 AM · Mini-Hibiscus
kent created T1345: z-belt tension deforms z-tops.
Wed, Nov 22, 7:31 AM · Mini-Hibiscus
kent created T1344: Tensioner mechanism affects belt path.
Wed, Nov 22, 7:25 AM · Mini-Hibiscus
kent created T1343: Tensioner mechanism only allows discrete tensions.
Wed, Nov 22, 7:23 AM · Mini-Hibiscus
kent created T1342: Set screws blocked by motor.
Wed, Nov 22, 7:21 AM · Mini-Hibiscus

Mon, Nov 20

kent added a comment to T1078: cura engine generating gcode to print the same line of infill multiple times.

I was using cubic subdivision. I have printed other parts with this infill type recently and did not see this issue. I think maybe it was resolved but I'm not sure.

Mon, Nov 20, 12:11 PM · Cura LulzBot Edition
kent added a comment to T1328: Wall thickness near insert.

For the sake of the ticket:

Mon, Nov 20, 12:08 PM · Yellowfin
kent added a comment to T1328: Wall thickness near insert.

This is the same problem we were having before. Evidently, our attempt to address the issue with a slice change was unsuccessful, independent of the test results we obtained at the time. @Baldwin I think a update to the geometry would be a reasonable next step. I looked into it in FreeCAD briefly and failed to come up with anything useful, but you are more familiar with the program and the design so hopefully you have some ideas. Thanks for looking into this.

Mon, Nov 20, 11:44 AM · Yellowfin

Nov 15 2017

kent committed rMINIHIBe3558aef3cf6: Added test geometries for dialing slices (authored by kent).
Added test geometries for dialing slices
Nov 15 2017, 8:39 AM

Nov 14 2017

kent committed rMINIHIBd159299cf38d: Adjusted two piece bed corner slice to reduce failure rate (authored by EricNugent).
Adjusted two piece bed corner slice to reduce failure rate
Nov 14 2017, 1:00 PM
kent committed rMINIHIB30e807ce04c7: Updated file names to have part numbers in them (authored by kent).
Updated file names to have part numbers in them
Nov 14 2017, 12:39 PM
kent committed rMINIHIBcb41bbf712ca: Updated part number on drawing (authored by kent).
Updated part number on drawing
Nov 14 2017, 12:32 PM
kent committed rMINIHIB27d4c057999e: Updated Molex connector housing part number (authored by kent).
Updated Molex connector housing part number
Nov 14 2017, 11:15 AM
kent committed rMINIHIB72481d780f64: Added z-top and z-motor mount for belt tensioner (authored by kent).
Added z-top and z-motor mount for belt tensioner
Nov 14 2017, 11:02 AM

Nov 10 2017

kent committed rYELLOWFIN614da326bae9: Updated prints to add bore locations and concentricity spec (authored by kent).
Updated prints to add bore locations and concentricity spec
Nov 10 2017, 3:29 PM
kent committed rMINIHIBed654579d868: Added motor stl and hibiscus blend file (authored by kent).
Added motor stl and hibiscus blend file
Nov 10 2017, 9:40 AM
kent committed rMINIHIBf1358f51551f: Added step files for the bottom and left side mini sheetmetal (authored by kent).
Added step files for the bottom and left side mini sheetmetal
Nov 10 2017, 9:30 AM