Xcarriage modification to attach Mendel extruder to BFB hot end

by BogdanKecman, published

Xcarriage modification to attach Mendel extruder to BFB hot end by BogdanKecman Mar 29, 2010
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WHY: BFB hot ends are very robust and easily obtainable. BFB even sell them assembled and with various nozzle sizes. They are aluminium+peek+teflon so very strong hence you can use them not only for ABS and PLA but also for HDPE, LDPE, PP, uPVC and some other materials.

WHAT: x-carriage has to be changed (to accommodate for the size of the bfb hot end) and the adapter has to be installed between extruder and xcarriage


  • print one of each
  • assemble xcarriage per manual
  • the upper 2 trapped nuts will have to be heat pressed into x-carriage upper
  • attach the bfb hot end to the adapter using 2 M5 screws so that "flat" part of the acrylic is to the longer side of the hole so that 2 m3 heads can be secured in the 2 remaining holes
  • press the hot end carefully into xcarriage
  • screw the extruder to the xcarriage trough the adapter

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will try thank 


may i ask you what PID settings and Thermistor Beta you use.

caus i want to hang such a Hotend to my Makerbot/Ultimaker derivate.

i just dont think the Thermistor is working correctly. its reads 1024
°C when cold.
changing parameters (small amount) has no effect.

For BFB hot end? I don't use beta, I use table provided by the ntc manufacturer, and I don't think my pid values would be of any use for you as my firmware works bit differently (self tuning aggressive pid..) ... anyhow with bfb hot end the simple bit banging will get you in the +-2C region and that's more then enough for printing..

You have moved the bfb hot head hole along the x carrige, between this version and the old version http://www.thingiverse.com/thing:1950http://www.thingiverse.com/thi... , the old one does not align with Yage motor pinch assemble (adrians)
does this one align Yage and bfb hothead ?

Mendel X Carriage modified to hold BitsFomBytes hot end

Yes, the old one was using extruder design I was testing (never finished), this one uses Adrian's pinch design and as you can see here: http://blog.reprap.org/2010/03/best-of-both-worlds.htmlhttp://blog.reprap.org/2010/03... I actually tested the design :)

Is there a soure file or did you edit the STLs direct?

edited stl directly. mine skills in AOI/openSCAD are limited so I move object from AOI to Netfabb back and fort to get the desired object, unfortunately - no parametrization left after that. I tried to cut out the cylinder in AOI but AOI "froze" every time I tried hence I cut it out in netfabb and then optimized the mesh in aoi

uploaded new version of the adapter.stl so you don't have to heat press the screws.

works like a charm, bfb hot end running 260C for 1h and no deformations on the xcarriage so far

also uploaded modified drive gear for the geared extruder - this one features m3 trapped nut and grub screw (you can easily use normal m3 screw if you can't find m3 grubs)

I printed drive-gear-bigger.v2 but the teeth are too long so it does not mesh with the big gear.

you are right .. the PLA one don't mesh in properly ... the PP one mesh ok because PP pulls inwards so the teeth get shorter