[Resolved] Bowden Tube connection

[andrew moss @amoss125 UK]

The Bowden tube keeps popping out from the push fit connector.

I have tried trimming the tube and replacing with a new tube but no luck so i guess the pneumatic push fit connector has failed.

These are out of stock so what size are the BSP / push-fit ends so i can source a replacement.

• This topic was modified 2 days, 1 hour ago by  Pete. Reason: resolved

[Dave @dodgydave80 My Robox is a Blue Commercial Version]

@amoss125,

They are a metric M5 thread at the X Carriage end.

https://store.camozzi.co.uk/Catalogue/Connection/Super-Rapid-Fittings/Micro-Super-Rapid-Push-In-Fittings/6512-Male-Stud—Parallel

 

[BHudson @bhudson I have both RoboxDual and other Robox versions Arizona, USA]

@amoss125 It is highly unlikely that the pneumatic connector has failed. Please try this method of inserting the tube.

1. Examine the end of the tube for marks. If you see a line about 2mm from the end, trim the tube straight at this line.
2. Insert a 100 mm section of filament into the end of the tube, leaving about half its length exposed.
3. Insert the tube and filament together into the connector but do not seat it.
4. Wrap the tube with one layer of thin cloth or paper towel to provide better grip.
5. Grip the tube tightly where it is supported by the filament inside.
6. Pry the locking collar on the connector out to its fullest out position and hold it.
7. Push the tube and filament into the connector until fully seated. A properly seated connection will not display movement between the collar and the body of the connector.
8. Remove the filament from the Bowden tube.

If the connection fails again at this point you are looking at a problem with the print head and you should open a support ticket.

I operate two Betas and four 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

[andrew moss @amoss125 UK]

Already tried this and the print head is new, tested with on 2 other robox printers, temperature is maintained no temperature drops during purge and the tube pops off randomly between 1 to 3 lines of a material purge.

Swapped the connector and doesn’t have a problem, did find some strands of plastic caught in the old connector so i guess these were stopping the push fit fully gripping the tube, who knows ??? problem now resolved.

 

Just a quick note for future model of printer

Add a rear access hatch or something!!! its a bloody pain if you have to work behind the print carriage, it would make swapping the print head easier plus give easy access to the tube and wired connections.

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