Bondtech Heatbreak any good?  

Active Member

Hi all, 

I've had an awesome time with the mini as my first printer - when it works. However, like many on this forum, I keep getting stuck on the hotend / extruder clogging issue. I've tried quite a few fixes, like moving the heatbreak up into the heatsink, increasing the printing temperature, or replacing the ptfe tube only for it to shrink a few hours later and leave me with a clogged hotend.

To that end, I was wondering how effective the Bondtech heatbreak is. I've seen lots of posts mentioning it, yet never found a definitive answer. For those who have it, how was the install process and what adjustments did you need to make to gcode, firmware, etc? Most importantly, did it solve your hotend / extruder clogging issues?


Posted : 19/06/2020 2:53 pm
Estimable Member

I installed it without any issues, my main issue was under-extrusion and the strong preference for Prusament filament to make a long story short It solved  my main issues got a workable printer now that even prints 2.5 year old filament. The Manual on there website explains it all only one thing to do is to change the start GCODE (There M301 gcode was not enough for me so I did the procedure my self (I have a sock) aand have some different M301 values) your mileage may vary. I did not had/have any clogging issues...

Mini with FW:4.1.0 + Bondtech Heatbreak...
Posted : 19/06/2020 6:27 pm
Active Member

After a few dozen hours my Mini started clogging and had the expanded end on the filament problem where the filament was sneaking around the end of the hot end PTFE tube and the filament could not retract.  (I think the tube gets hot and shrinks)

I changed out the stock heatbreak for the Bondtech (including their shorter tube) and installed a Bondtech Dual Extruder (I want to do flex filaments later). I’m not sure which one fixed the problem but together it has been printing without clogging during multiple 12-15 hour prints with both Prusament and non-Prusa PLA.   The Bondtech heatbreak is the design Prusa should have used. 

Posted : 20/06/2020 11:31 pm
Active Member

Thanks so much for your responses. I decided to go for it and the heatbreak is on its way. I'm looking forward to installing it and will update as I go! 

Posted : 22/06/2020 5:38 pm

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