QU-BD MBE Extruder Issues I am running a QU-BD MBE extruder on my Prusa I3 and having some strange issues. I can print great quality until it seems that an air pocket forms in the heat barel. I print say 3-5 layers and then the PLA begins to turn dotty as if the temperature was too low and after about a layer it stops extruding. If I pause the print and release tention I can push about 10mm of filament in without any resistance and then I will feel resistance and the nozzle will start to eject plastic. I can then continue to print without any issues for 3-5 layers. I find printing hotter and faster works better as if I print as 200c and 10mm/s then I can not even get the first layer down. But at 230c and 60mm/s I can print 3-5 layers. I am not using the stock grub screw tightener but the buildlog.net mods So I have a spring tentioner and a MK7 driver. The entrance to the hot end is as tight to the idler bearing as possible. Anybody have an idea what causes this "air pocket" sort of feeling? https://reprap.org/forum/read.php?1,227074,227074#msg-227074 Thu, 16 Apr 2026 07:31:30 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,227074,227259#msg-227259 Re: QU-BD MBE Extruder Issues https://reprap.org/forum/read.php?1,227074,227259#msg-227259 BloomingtonMike General Mon, 15 Jul 2013 15:00:23 -0400 https://reprap.org/forum/read.php?1,227074,227228#msg-227228 Re: QU-BD MBE Extruder Issues https://reprap.org/forum/read.php?1,227074,227228#msg-227228
I will PayPal you right away. I will put my address in the transfers comments.]]> uMinded General Mon, 15 Jul 2013 12:36:35 -0400 https://reprap.org/forum/read.php?1,227074,227222#msg-227222 Re: QU-BD MBE Extruder Issues https://reprap.org/forum/read.php?1,227074,227222#msg-227222 BloomingtonMike General Mon, 15 Jul 2013 12:06:26 -0400 https://reprap.org/forum/read.php?1,227074,227217#msg-227217 Re: QU-BD MBE Extruder Issues https://reprap.org/forum/read.php?1,227074,227217#msg-227217 uMinded General Mon, 15 Jul 2013 11:34:20 -0400 https://reprap.org/forum/read.php?1,227074,227180#msg-227180 Re: QU-BD MBE Extruder Issues https://reprap.org/forum/read.php?1,227074,227180#msg-227180
barrel_zpsed0a607d.jpg


$15ea shipped (lower 48USA only at this time) paypal gift to mike at thewoodworker dot net.

Due to the extreme distances and lovely handlers of packages, We cannot guarentee deliveries to Canada and Hawaii and Alaska or any international shipping so I am not shipping there at this time. When Rodney stocks us way up and we can afford to guarentee the barrel deliveries, then those locations will pay $15ea paypal gift and actual shipping.

Mike Heidrick
]]> BloomingtonMike General Mon, 15 Jul 2013 08:45:07 -0400 https://reprap.org/forum/read.php?1,227074,227157#msg-227157 Re: QU-BD MBE Extruder Issues https://reprap.org/forum/read.php?1,227074,227157#msg-227157
While I am waiting would this be an issue with ABS? I imagine the higher melting temp would help with the creeping.]]> uMinded General Mon, 15 Jul 2013 06:58:46 -0400 https://reprap.org/forum/read.php?1,227074,227080#msg-227080 Re: QU-BD MBE Extruder Issues https://reprap.org/forum/read.php?1,227074,227080#msg-227080 After hundreds of hours of trying to get PLA to run through the QU-BD extruder I installed PTFE tubing in the barrel.

[www.buildlog.net]

I have made some one piece barrels and Mike has them for sale for $15 each. Email Mike at

mike at thewoodworker dot net

Rodney]]> REdington General Mon, 15 Jul 2013 00:40:38 -0400 https://reprap.org/forum/read.php?1,227074,227074#msg-227074 QU-BD MBE Extruder Issues https://reprap.org/forum/read.php?1,227074,227074#msg-227074
I print say 3-5 layers and then the PLA begins to turn dotty as if the temperature was too low and after about a layer it stops extruding. If I pause the print and release tention I can push about 10mm of filament in without any resistance and then I will feel resistance and the nozzle will start to eject plastic. I can then continue to print without any issues for 3-5 layers.

I find printing hotter and faster works better as if I print as 200c and 10mm/s then I can not even get the first layer down. But at 230c and 60mm/s I can print 3-5 layers.

I am not using the stock grub screw tightener but the buildlog.net mods So I have a spring tentioner and a MK7 driver. The entrance to the hot end is as tight to the idler bearing as possible.

Anybody have an idea what causes this "air pocket" sort of feeling?]]> uMinded General Sun, 14 Jul 2013 23:27:18 -0400