SLASH Pro multiple problems on brand new machine

Updated on November 14, 2018 in Hardware
20 on October 10, 2018

After receiving my brand new SLASH Pro from the Kickstarter campaign a couple days ago, I am VERY DISAPPOINTED that it does not work and has multiple issues:

  1. My first test print failed (It did not print, and did not cure any resin), and after further testing I have found that the LCD screen is not working properly. When I click “Show Logo” the fans start spinning, and the screen lights up for a second, but no logo is shown. I checked the LCD cable connection, re-connected it, but I still have the same problem. Please see video of the issue (https://youtu.be/EnZiLGf0CrA) for more detail.
  2. Also while running my initial test print I noticed that the resin level sensor does not stay in place. The sensor is very loose, and often pulls itself out of place. Please see video of the issue here: https://youtu.be/6UnFKUhB0EQ
  3. Also after emptying the resin tank I noticed some small droplets on the underside (LCD side) of the tank. This makes me worry that the tank was not manufactured properly and may not be sealed properly. Might be best to replace the resin tank that came with this Pro.
  4. Lastly I noticed that on UNIZ’s website and on the old SLASH there was supposed to be an area to rest the resin sensor for when the resin tank needs to be removed, but my new SLASH Pro only has this tiny useless little tab that sticks out. Because there is nowhere to rest the resin sensor, I have to let it hang loose or temporarily tape it to the back of the machine in order to keep it from touching the LCD screen. Below is a photo of my machine vs what UNIZ shows on their website:
    My SLASH Pro: 
    UNIZ’s website: 
 
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8 on October 11, 2018

Hi, I’m very sorry to hear that, I think the LCD is broken, need to be replaced and you can email our support to ask for help, as for the loose sensor, did you make sure it’s in place? for the 3rd question you mentioned, it’s the old one on our website, and the new printer is like what you own.

on October 11, 2018

I am 100% sure that the sensor is in place. Did you see the video I linked to? https://youtu.be/6UnFKUhB0EQ Please let me know if I am doing it wrong in the video, or if you have any recommendations. Otherwise it seems like there is a mismatch or design flaw here, and parts will likely need to be replaced… either the tank or the resin sensor holder should probably be re-designed.

Referring to question #4, could you provide a photo (or link, or manual page #) that shows how to hook the resin sensor onto this new design? I have not been able to figure it out, and as you can see from the photo… taping it to the machine.

Thanks for your help.

on October 11, 2018

Sorry for the defective printer, there is something wrong with that, and we’ll arrange a replacement unit for you, our support will contact you later.

Referring to question 4, there is a picture shows how to hook the resin sensor.

on October 11, 2018

Okay, I definitely tried this, but it is EXTREMELY tight. Are you guys sure that this is not too tight, and that it will not damage the cable over time? It is difficult to push the cable into that slot, and really seems like it is made for a thinner cable.

Here is what my cable looks like after inserting it as shown in your photo (it already looks like it is getting damaged):

on October 12, 2018

It’s ok, don’t worry. Or you can have a try with the tube like that way.

on October 12, 2018

I really do not think this is okay. The cable is going to become damaged over time. Seems like you guys made the design worse in this area, and maybe intentionally did this so that our printer’s resin sensor will break over time so that we can buy new ones from you. Why was this part of the design changed?

The tube is much thicker than the cable, and would be even more prone to damage. I expect UNIZ to replace this cable when it breaks from this poor design choice.

on October 12, 2018

I just tried it with the tube. While I think it is safer to use the tube, I still think this is a pretty odd design choice compared to the previous design. Definitely seems like the opposite of an improvement.  Perhaps this was an effort to save on production costs?

on October 12, 2018

I’ll feed it back to our design department.

on October 12, 2018

I also have the loose resin sensor problem.  The manufacturing tolerances must be messed up to have this poor of a fit.  A simple live hinge snap would have prevented this issue.

 

 

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2 on October 12, 2018

There still are several minor problems like loose sensor connection and not having proper tube hanger, however as long as the printer prints, we can get by with those small problems.

Now the LCD is a big problem. I used the machine little more than a year but already replaced it 2 times. 

I bought 2 extra LCD panel and keeping it just in case. I hope UNIZ improves this area in the future too.

 

on October 12, 2018

While I agree that a screen failure is a higher severity failure mode than a loose sensor connection, I respectfully disagree that we can get by with the latter.  Hearing a crunch at the start of print as the sensor is knocked loose does not inspire confidence in the machine or the diligence of the testing that went into it.  

My two cents.

on October 12, 2018

I’ll have to agree with DP here. The loose sensor will likely cause many SLASH screens to be broken. This defect is going to plague these machines until the design is corrected.

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1 on October 12, 2018

I totally feal yall. There are bunch more little problems and you don’t know what I had to go through.

I had to disassemble the machine several times to fix other problems. But after all, this is a cheep Kickstarter funded machine with no proven records so some problems you report to the company and live with it until they make an improvement. 

So I say ok, I don’t care how ugly the machine is, as long as it prints good, I can live with small problems.

Them sensors, they don’t even work accurately so I don’t even care hooks up or not. 

on October 12, 2018

Sorry to disagree, but this is UNIZ’s second Kickstarter (Unfortunately it appears as if they have learned very little from their first campaign). Their first KS campaign was for the original SLASH, which was basically the exact same machine, except it did not support UDP. I did not have any of these problems with my original SLASH… believe it or not… it just worked (that goes without saying it is definitely no Formlabs printer in terms of quality)

While my original SLASH’s resin sensor seemed to work just fine, the new SLASH OL/Pro/etc. sensor is definitely a problem in two areas:

  1. It does not stay in place while mounted into the resin tank, which can cause it to fall out at the beginning of a print, and thus crush the LCD screen.
  2. It is not as easy as it used to be on the original SLASH to keep it out of the tank/out of the way unless you want to potentially damage the sensor cable. In order to replace the resin tank, it is critical to be able to keep this dangly part out of the way so that it does not hit the LCD screen. We should not be having to clean the LCD screen off or risk cracking the LCD screen because the resin sensor refuses to stay out of the way. However it does seem to stay out of the way more safely when wedging the rubber resin tube into the holder instead of the cable.

Oh, and I don’t think I mentioned that the resin sensor on the new SLASH Pro did not seem to be reading anything. I have not tried to re-calibrate it, but it definitely did not work out of the box like the one in my original SLASH did.

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1 on October 20, 2018

Been trying to get mine to print for 3 weeks now. It still wont work, no resin is cured or anything. Support couldn’t solve the problem and have stopped responding to my ticket. I am not sure what to do. 

Also the wifi connection issues are a real pain.

on October 22, 2018

Hi, did you have a test with the function “show logo” without the tank and the platform to check if the LCD is working?

Can you post more details about the WIFI connection issues?

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2 on November 3, 2018

I received the replacement SLASH PRO (to replace the defective unit from my original post), which seems to be working better (LCD actually works)… but the resin level sensor is still extremely loose. Seems like the new tanks were not manufactured to spec, and so the resin level sensor does not seat firmly into place. UNIZ, please fix this issue, and replace these incorrectly manufactured tanks. Otherwise many users will suffer cracked LCD screens due to this design flaw.

on November 12, 2018

I just got my Slash Pro and have the similar issues and also VERY DISAPPOINTED.

1) First print;  nothing printed – except –  a few layers of material on my screen = brand new machine has just borked itself.  No response from Uniz so far . . .

2) Fixture to hold the level sensor is way too loose.  Too Uniz wants to ignore the issue and just ask if you are sure you installed it correctly.

3) Slotted tab to hold resin sensor while the tank is out is way too small to accept the sensor wire to hold it while the tank is out.  I suspect the tooling for the tab was finished, parts produced, and then Uniz had to swap in a larger sensor wire.  But again, they don’t seem to want to admit theres is a problem, just try to have you work around it.

I now regret having purchased this machine as I have grave doubts I will ever get anything approaching the price back out in printed value.

on November 14, 2018

@Art, I totally feel your pain. UNIZ treats its customers (us) like complete morons… but umm… WE ARE NOT STUPID! UNIZ needs to get their sh*t together if they want to be a successful company.

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0 on November 14, 2018

UNIZ sent me a full resin sensor replacement in order to fix the loose resin sensor issue…. but the replacement resin sensor has the exact same problem, and is extremely loose.

I hate repeating myself and others, but this is a serious problem and needs to be fixed. Once this issue has been addressed and fixed, UNIZ needs to provide their customers with the replacement parts necessary to resolve this issue once and for all!

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