Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...
 
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Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...  

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towlerg
(@towlerg)
Noble Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

So the Bondtech heat-break still has a piece of PTFE tube inside?

Posted : 29/03/2020 2:07 pm
Benji
(@benji)
Estimable Member
Topic starter answered:
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

@towlerg

Yes it does, but shorter. 35.3mm instead of the stock 43.4mm.

Prusa Mini Silicone Bed Leveling Mod: https://bbbenji.github.io/PMSBLM/...
Posted : 29/03/2020 2:18 pm
WouterV
(@wouterv)
Eminent Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

Regarding how tight the PTFE tube should be, I received this email from Bondtech:

Hi Wouter and thanks for your mail, as the PTFE in the Prusa heatbreak is in the hot-zone it is critical to tighten it down to avoid having a pocket for melted filament, as the PTFE sits in the cold zone on our heatbreak it is not as critical.

So that's great to hear! I also asked them if they had cheaper shipping (18 euro product + 18 euro shipping feels off for me), they don't, and if they could post some more thermal data of their heatbreak vs prusa heatbreak on their site, they'd look into it.

Posted : 29/03/2020 7:27 pm
SS220
(@ss220)
Estimable Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

I bit the bullet and ordered one.

Posted : 31/03/2020 4:56 am
WouterV
(@wouterv)
Eminent Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

I also ordered one. By the way, in the next days they're going to add a cheaper untracked shipping option (using Postnord, Sweden's main postal company). For me in the Netherlands shipping cost went down to ~€2.30 (iirc) instead of the tracked packet which costs ~€18.

Posted : 31/03/2020 10:47 am
BoatBuilder
(@boatbuilder)
Eminent Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...
Posted by: @wouterv

I've emailed Bondtech asking for clarification. They also have a chamfer in the PTFE tube whereas Prusa has a flat end.

Please post what you get for an answer. I bought the Mini to make parts based on Prusa’s reputation, not to spend my time as a beta tester. 

I too have ordered the BondTech heat break as well as their dual and a silicon carbide nozzle so I can do carbon fiber filled nylon. I’m am will to spend a little upgrade cash to have a small reliable printer. 

Posted : 01/04/2020 10:11 pm
Benji
(@benji)
Estimable Member
Topic starter answered:
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

Just got my Bondtech heatbreak in. Will be installing it later today.

Prusa Mini Silicone Bed Leveling Mod: https://bbbenji.github.io/PMSBLM/...
Posted : 02/04/2020 10:02 am
WouterV
(@wouterv)
Eminent Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...
Posted by: @vazovsky
Posted by: @wouterv

I've emailed Bondtech asking for clarification. They also have a chamfer in the PTFE tube whereas Prusa has a flat end.

Please post what you get for an answer. I bought the Mini to make parts based on Prusa’s reputation, not to spend my time as a beta tester. 

I too have ordered the BondTech heat break as well as their dual and a silicon carbide nozzle so I can do carbon fiber filled nylon. I’m am will to spend a little upgrade cash to have a small reliable printer. 

I posted it, look a few replies up for the answer.

Posted : 02/04/2020 10:50 am
BoatBuilder
(@boatbuilder)
Eminent Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...
Thanks. Is it worth it to get some Capricorn tubing to replace both the piece in the heat break and the Bowden tube? I understand that it is better quality with a higher temperature rating. 
Posted : 02/04/2020 3:28 pm
Benji
(@benji)
Estimable Member
Topic starter answered:
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...
Posted by: @marek-w6

Anybody knows what are dimensions of heatbreak?

This post was modified 2 years ago by Benji
Prusa Mini Silicone Bed Leveling Mod: https://bbbenji.github.io/PMSBLM/...
Posted : 02/04/2020 3:55 pm
mobile4you
(@mobile4you)
Active Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

@benji

What about your Bondtech heatbreak? Have you already tested something?

Posted : 05/04/2020 11:45 am
Benji
(@benji)
Estimable Member
Topic starter answered:
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

@marek-w6

First print after calibrating was a 6hr egg. Came out really nicely. I have been printing face shields for the past two days now and no problems yet. Too soon to say if this fixed my problems for good. For now I'm happy with my Mini and the Bondtech heatbreak.

Prusa Mini Silicone Bed Leveling Mod: https://bbbenji.github.io/PMSBLM/...
Posted : 05/04/2020 11:55 am
mobile4you
(@mobile4you)
Active Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

@benji

When I asked about the heatbreak dimensions, I wanted to check if it was possible to use the heatbreak with the i3 MK3. Of course after machining. Maybe even with heaterblock. This is the last chance solution. If you can attach some photos after the tests.

Posted : 05/04/2020 12:47 pm
SMMottershead
(@smmottershead)
Eminent Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...
Posted by: @benji

@marek-w6

First print after calibrating was a 6hr egg. Came out really nicely. I have been printing face shields for the past two days now and no problems yet. Too soon to say if this fixed my problems for good. For now I'm happy with my Mini and the Bondtech heatbreak.

Would be interesting to know his to when it has been used for a bit. Just wish they you could get them in the UK. It would come to £33 after shipping, fees, etc. 

Posted : 05/04/2020 12:58 pm
towlerg
(@towlerg)
Noble Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

@ste

Did you see wouterv's post above. What a pity this board doesn't have numbered posts.

Posted : 05/04/2020 1:43 pm
SMMottershead
(@smmottershead)
Eminent Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

@towlerg

Ohhh no I didnt, thanks for pointing that out 🙂

Posted : 05/04/2020 1:55 pm
SS220
(@ss220)
Estimable Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

Mine has shipped. I was a little disappointed that I couldn't order extra PTFE tubes on their site. The tube is described as:
1x 35.3 mm 2/4 chamfered PTFE tube

I don't know what the 2/4 chamfered part means. Can anyone interpret? Hopefully someone will create a jig to let us make extras.

 

Posted : 05/04/2020 1:56 pm
mobile4you
(@mobile4you)
Active Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...
Posted by: @stevensmith

[...]   2/4 chamfered part means. [...]

 

 

It just means 2mm/4mm tube with chamfers.

Posted : 05/04/2020 2:04 pm
SS220
(@ss220)
Estimable Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

Doh! Thanks. I thought it was referring to the amount of chamfer 😊 

 

Posted : 05/04/2020 2:10 pm
smt674
(@smt674)
Active Member
RE: Under extrusion? Over extrusion? Clicking? Pilling? Inconsistent layers? Clogging? Unloading problems? It's probably all the same core issue...

I have a hunch this may be a thermal/creep related problem.  I went through all the typical fixes, hotend scoot, extruder cleaning, etc. to notice that the PTFE tube shrank significantly, approximately 1mm.  Replacing the tube seems to have fixed my issues for now.

My issues seemed to be exacerbated by an ASA print at high temp.  Wonder if insufficient cooling at the heat break is causing the PTFE tubing to shrink around the filament path and trigger under extrusion. 

We'll see how long I last with the updated PTFE tube.

Posted : 08/04/2020 1:01 am
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