PTFE Tube on Hotend Assembly too long?  

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daniel.e24
(@daniel-e24)
Active Member

I was working on my MK3s upgrade when I tried installing my brand-new hotend assembly. My old one became terribly jammed until just recently I borrowed a friend's heatgun and cleared it. Because the old one was somewhat defective, I opted to use a new one. Sliding it into place during assembly, though, I noticed that the PTFE tube was way too long and gets in the way of the Bondtech gears. I am a university student with very limited access to tools that I could use to trim the tube down. I obviously don't need another destroyed hotend assembly. What should I do?

Posted : 05/03/2019 6:46 am
daniel.e24
(@daniel-e24)
Active Member

Well how silly of me! I figured out that if I unscrew the heat block, I can push it in a bit deeper. Problem solved!

Posted : 05/03/2019 7:25 am
toaf
 toaf
(@toaf)
Noble Member

seems the university is paying off... sorry.. glad you figured it out. did you put a clip on the top to hold it in?

I have a Prusa,therefore I research....
Posted : 05/03/2019 8:04 am
vintagepc
(@vintagepc)
Noble Member

Check the length. It should be 45mm. If it is 50 you have an R3 or earlier PTFE tube and need to cut it down.

I hope you don't mean you unscrewed the heatsink by 5mm to make it fit; that'll give you no end of problems.

Posted : 05/03/2019 2:05 pm
daniel.e24
(@daniel-e24)
Active Member


Check the length. It should be 45mm. If it is 50 you have an R3 or earlier PTFE tube and need to cut it down.

I hope you don't mean you unscrewed the heatsink by 5mm to make it fit; that'll give you no end of problems.

Nope. I was able to tighten it again after screwing it back.

Posted : 05/03/2019 4:52 pm
Grandpa Joe
(@grandpa-joe)
Eminent Member

How far past the hot end collet should the PTFE tube extend?

Posted : 05/04/2019 11:27 pm
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