I've gotten this far, advice and questions

Vat designs and coatings etc..., Electronics and mods, Z stages and mechanisms to release the prints from Vats etc...
wesmain
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I've gotten this far, advice and questions

Postby wesmain » Mon Feb 09, 2015 10:45 am

http://imgur.com/cYgacTb link to photo

The build is less challenging than I thought. The guide is perfect except for the changes that have been made to the kit and the most difficult part was getting everything to be straight. I have some advice based on my bumps in the road.:

I straightened everything by loosening all of the bolts after the frame was put together then tightening each side simultaneously. (Left and right front bottom screws at the same time, then back bottom screws etc.)

Like the guide says, be careful not to over tighten the nuts and bolts. This was my worst mistake, I over tightened and changed the shape of some of the wood pieces on accident. I bent my motor mount and had to put 2 washers under the motor to make it sit straight to make my m5 rod parallel with the aluminum extrusion.

The bearings with the eccentric bushings might seems like they don't fit, but keep trying without forcing them and they will fit. Spin the eccentric bushings so that the smallest side is facing the extrusion, then spin them again after installing to tighten the carriage.

I have some questions as I get closer to the end.
Do I need to flash my arduino with firmware? Or is the firmware already on there?

Any advice on extending the build platform? My 1inch platform has a little nub in the center of it, I was going to slice off the nub, then glue a 2" or 3" aluminum disk to it.

What setting should I use or try in the Creation Workshop software to configure my machine?

Thanks

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Jimustanguitar
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Re: I've gotten this far, advice and questions

Postby Jimustanguitar » Mon Feb 09, 2015 11:06 am

wesmain wrote:The guide is perfect except for the changes that have been made to the kit


Welcome to the forum! Looks like a nice build so far.

If you've found differences between what you received and what's in the manual, make sure to report it in the thread for the manual: viewtopic.php?f=77&t=4372&start=225


*edit* Never mind, you're building a different machine than I thought you were. I'm not sure if there's a manual thread for the DropLit or not.

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Re: I've gotten this far, advice and questions

Postby Nylocke » Mon Feb 09, 2015 11:30 am

I almost did the same thing Jim :D

I think the Arduino is unflashed as it is.

Gene is/was working on Droplit manual, don't exactly know whats going on with that. If you need a good reference, check out Mhacney's droplit build in the build zone sub forum.

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Re: I've gotten this far, advice and questions

Postby wesmain » Mon Feb 09, 2015 3:04 pm

Thanks !
Yeah, I've been using this guide http://download.seemecnc.com/droplit/Dr ... -Guide.pdf

The only differences in the guide that I found were discussed here: viewtopic.php?f=89&t=7083#p57271
The only changes I can remember were the arduino hole locations, and the 4 cheapskate bearing holders that don't come apart.

I just found the hardware instructions: https://github.com/seemecnc/Droplit/blo ... ctions.txt

mhackney's Beta DropLit build: viewtopic.php?f=42&t=6190&start=75&hilit=droplit+build
Apparently, according to comments on the last page there are some problems with the droplit firmware.

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Re: I've gotten this far, advice and questions

Postby geneb » Tue Feb 10, 2015 10:19 am

I've never been able to get the firmware for mine to work - I can interrogate it and it replies, but the first G code causes it to become unresponsive. I haven't had the time to chase it down.

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Re: I've gotten this far, advice and questions

Postby wesmain » Tue Feb 10, 2015 5:33 pm

How did you get to that point? I just finished building the machine, now I can't make it move.

I downloaded Xloader and uploaded this from the firmware instructions:
https://github.com/grbl/grbl-builds/blo ... 131207.hex

I have Creation Workshop and tried to use their controls to move the stepper, but its not moving or registering.
Did I miss a step?

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Re: I've gotten this far, advice and questions

Postby wesmain » Thu Feb 12, 2015 1:40 pm

I got it to move by controlling it with Creation Workshop. At first the motor was super loud and chunky sounding so I adjusted the trim pot. It still doesn't turn smoothly, but its not as loud. Trying to figure out why its no turning smoothly.
Also, I tell it to move 10mm, and it moves atleast 20mm. More to do

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Re: I've gotten this far, advice and questions

Postby mhackney » Sat Feb 14, 2015 9:44 pm

I posted my firmware for the grbl and config in my droplit build thread. You should be able to upload it and as long as you connect things the same as mine, it will work.

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Re: I've gotten this far, advice and questions

Postby wesmain » Sun Feb 15, 2015 11:54 am

mhackney wrote:I posted my firmware for the grbl and config in my droplit build thread. You should be able to upload it and as long as you connect things the same as mine, it will work.


Thank mhackney, I actually got the machine to do a dry run. It looks like fine, but maybe the distance its traveling is still too much. I'll check out your thread.

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Re: I've gotten this far, advice and questions

Postby wesmain » Mon Feb 16, 2015 10:22 pm

mhackney, I removed the jumper that was making the z move the wrong distance. I think its moving the right distance now, thanks.

I tried to flash the board with the grbl.hex.txt file you uploaded. I changed it to a hex file instead of a txt file, it would upload, but the machine wouldn't move, so I went back to the hex file in the Droplit_master on github and it started working again.

Also when I move the z axis up or down with the commands in Creation Workshop, the top nut in the anti backlash assembly moves alot and the carriage shifts a little bit as it moves. Don't know if this will effect print quality, but I'll try to find a way to fix this

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Re: I've gotten this far, advice and questions

Postby mhackney » Mon Feb 16, 2015 10:37 pm

Did you get the hex file out of the zip package I posted in my DropLit build thread several days ago?

As for that anti-backlash nut, I noticed this too. In practice, backlash is not a problem since the build surface is always pushed into the vat to flash a new layer. The withdrawal simply needs to break the hardened resin free from the vat surface. However, you can either wrap a rubber band or even a small zip tie around the two upright arms of the anti-backlash print to squeeze the in against the top nut.

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Strategies for Resolving Print Artifacts

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Re: I've gotten this far, advice and questions

Postby wesmain » Tue Feb 17, 2015 12:07 am

mhackney wrote:Did you get the hex file out of the zip package I posted in my DropLit build thread several days ago?

As for that anti-backlash nut, I noticed this too. In practice, backlash is not a problem since the build surface is always pushed into the vat to flash a new layer. The withdrawal simply needs to break the hardened resin free from the vat surface. However, you can either wrap a rubber band or even a small zip tie around the two upright arms of the anti-backlash print to squeeze the in against the top nut.


Haha, thanks! the hex file I got was from August. I just downloaded the new zip.

I'll try the rubber band advice. When I saw my z-carriage twist a little bit my first thought was that it could almost be like a passive separation mechanism like a passive tilt, so maybe it could be a good thing.

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Re: I've gotten this far, advice and questions

Postby wesmain » Thu Feb 26, 2015 7:10 pm

I'll have a working Droplit if I can reverse the direction of the stepper motor, it goes the wrong way. Could I just switch the order of the wires?

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Re: I've gotten this far, advice and questions

Postby mhackney » Thu Feb 26, 2015 10:38 pm

Yes you could just change the wire order, that works fine.

Sublime Layers - my blog on Musings and Experiments in 3D Printing Technology and Art

Start Here:
A Strategy for Successful (and Great) Prints

Strategies for Resolving Print Artifacts

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wesmain
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Re: I've gotten this far, advice and questions

Postby wesmain » Fri Feb 27, 2015 11:26 am

mhackney wrote:Yes you could just change the wire order, that works fine.


Thanks I'll try today, and probably try my first print tonight!

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Re: I've gotten this far, advice and questions

Postby wesmain » Sun Mar 01, 2015 1:50 pm

mhackney wrote:Yes you could just change the wire order, that works fine.


Thanks again, the motor is going in the right direction now!
I'm doing some dry tests by focusing on a piece of paper and running the print, but it seems like the the Droplit and my projector aren't in synch. Like the projector flashes a photo at the wrong time, or the z-axis isn't in the right spot when the projector flashes.
Here's a video of the machine running
https://vid.me/zC8n

i'm almost there!

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Re: I've gotten this far, advice and questions

Postby wesmain » Sun Mar 01, 2015 3:31 pm

I tried to print a cylinder and I got about 5 layer printed, then nothing was building on to the print after that.
Then I tried to print a marvin and only the first layer of the feet printed. After I stopped the print and looked at the build plate, it looked as if the first layer had slipped across the build platform. The cylinder had also moved a little. It seems like I'm having trouble getting the prints to stick to the dumbell. Is this a common problem?

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Re: I've gotten this far, advice and questions

Postby mhackney » Sun Mar 01, 2015 4:20 pm

I didn't have any problems sticking. Make sure to set Z=0 so the dumbbell is touching your build surface. Also make sure it is clean. Your video timing does look a bit odd. Can you post your slicer configuration for us to look at?

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Start Here:
A Strategy for Successful (and Great) Prints

Strategies for Resolving Print Artifacts

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Re: I've gotten this far, advice and questions

Postby wesmain » Sun Mar 01, 2015 5:30 pm

mhackney wrote:I didn't have any problems sticking. Make sure to set Z=0 so the dumbbell is touching your build surface. Also make sure it is clean. Your video timing does look a bit odd. Can you post your slicer configuration for us to look at?


Hey mhackney, I just checked my thread on buildyourownsla and I saw that you replied there! I was suprised to see you there too haha,

Here's an album of my Creation Workshop settings http://imgur.com/a/GoT0A

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Re: I've gotten this far, advice and questions

Postby wesmain » Mon Mar 09, 2015 2:33 pm

I just completed my first print. Looks like i've still got a long way to go! Any suggestions on how to fix these artifacts? Or at least pinpointing the problem, I think it is either z-wobble or undercuring. Thanks!
Image
Image

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Re: I've gotten this far, advice and questions

Postby mhackney » Mon Mar 09, 2015 2:52 pm

That is some sort of Z axis artifact so concentrate on watching and feeling the Z axis move without printing. Something this big should be "painfully obvious".

Sublime Layers - my blog on Musings and Experiments in 3D Printing Technology and Art

Start Here:
A Strategy for Successful (and Great) Prints

Strategies for Resolving Print Artifacts

The Eclectic Angler

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Re: I've gotten this far, advice and questions

Postby carlsgems » Mon Apr 20, 2015 3:38 pm

found this thread, what wires are switched to correct the motor direction,

Thanks


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