This topic contains 10 replies, has 6 voices, and was last updated by 
Microcan 1 year, 6 months ago.
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I recently bought a CEL Robox. There is a problem with cleaning the tip at the start of the print.
I start with a clean nozzle before I print. Then at the start of the print the printer goes to the tip wipe blade. Then one or two things happen.
- a string of filament comes out the nozzle and drops into the mechanical parts of the machine. (90 % of the time)
- the string of filament sticks to the nozzle and completely ruins the print (10% of the time)
sometimes caused by the big nozzle that is not even used during the printI already did all the calibration procedures. But the problem persists.
The filament strings also cause a problem when printing multiple parts. At the end of the print a web of thin strings of filament connect the parts. Printing with the green ABS that comes with the printer.
So far I only had clean models when they are continues and print a single part at the time. However this is very time consuming since it takes a long time for heating up and cooling down.
Is it possible to print multiple part on after the other this will prevent the web of strings between the parts and prevents the cooling and heating between parts.
@microcan we have recently released an upgraded tip wiper that can be purchased here.
Material dropping down into the Robox should not cause an issue and it was designed with this in mind, however if it does cause an issue, please contact our support team who will be happy to help you here.
With regards to material being dragged into your prints, your tip wipe blade may not be quite high enough to catch and remove the material from the nozzle. I would recommend removing the tip wipe (it just pulls out) cutting a piece of filament the same length, and then dropping it in to the tip wipe slot before replacing the tip wipe.
I’m afraid it is not possible to print multiple parts on the print pad one after the other rather than simultaneously. Does the stringing ever occur in single parts where a travel is required? You may need to calibrate your nozzle opening, you can find this in the calibrate menu in Automaker, the software will guide you through this procedure step by step.
Let me know if you have any questions, I know there is a lot of information there!
S
As mentioned: I already did all the calibration procedures.
I did the calibration procedure again and set the nozzle opening to 0.65 instead of 0.70 the point where filament comes out of the nozzle. I will pull up the wipe blade a bit to see if this helps.
I am surprised that you intend to waste filament into the mechanics and jam the print bed. I does not look good to me and it sounds awful. Why was the Robox not shipped with the improved wipe blade. I received my printer last Thursday.
I will give multiple components another try and send you a picture.
On this print run the stringing is almost gone.
The fourth part is missing the Brim and some of the first layers on the right side. The leveling is not 100% correct yet. I noticed that the print bed is curved. Do you do a linear correction or a curved height correction?
Can I flip the print bed?
@microcan It is very possible that the Robox you received was manufactured before the new tip wiper was released and that is why you did not get it.
You have done the calibration, but have you stopped the nozzle opening at the first sign of any material coming out of the nozzle or did you stop the calibration when material actually flowed? You need to stop it at the very first sign of any material at all coming from the nozzle.
There is a chance that your print bed itself is not level or your PEI sheet is not flat. You can remove the sheet and flip it over - you should install it with the sheet oriented so that it makes a U shape - with the outer edges bending up slightly from the center. This will allow the clips to force the sheet tight against the heat bed.
On all of my printers without the new tip wiper the mini-purge material is caught by the edge of the bed the majority of the time. It is only rarely that any material will fall into the area below the bed. In all of my hundreds of prints and close to a thousand hours of printing on my three Robox units I have NEVER had a mini purge fall into the area below the bed and jam the bed. The stepper motor is strong enough to pull the bed out of my fingers. In addition, there is little to no place to catch the material and cause a jam. If you have seen this happen, I would love to see pictures of it.
The thinner first layer on the right side is caused by the Bowden tube pulling the head up a little on the left side. It happens on every Robox I have seen and all of my units. It hasn’t caused an issue with any of my prints.
I operate two Betas and one Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben@bhudson “In all of my hundreds of prints and close to a thousand hours of printing on my three Robox units I have NEVER had a mini purge fall into the area below the bed and jam the bed.”
And yet in a few tens of hours I used Robox, in total, it did fall in many times for me. As it did for many people here. Also, it falling in the chamber below the bed and got stuck in the grills and bed moving in and out caused table surface below the printer to get quite scratched.
Earlier advice from CEL was to regularly take the bottom front cover and take the debris out of it.
you can wedge a small piece of paper (3cm long by 1.cm deep) into the slot the wiper goes in and gently ned it out to a near horizontal catcher abut 8mm deep in front of the wiper - low tech but it works and how I have run my Robox since day 2 😉
Steve N | Creator of things both virtual and physical
Briljant idea instead of paper I used aluminium foil. First time the it vibrated off during print, so I made it a bit bigger and bended the sides.
I had the problem too, about 30% dropping down after the mini purge.
But this is a 3D Printer 🙂 , so I printed a few of these:
Remix of “Robox Filament Catcher (by nonzero)”
Fixed all those problems for me.
Thanks I am printing it now. Also a good time to test the finest resolution
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