j_tso
Dork
3/13/23 2:30 p.m.
The office just acquired a new Bambu printer and a spool of this stuff. From quick googling it's pretty particular about feed&speeds and making sure the filament is free of moisture.
I have a couple of projects in mind. The big one is an airbox for my carb. Heat resistance looks good, but though it says oil resistance is good, I'm not sure how well it'll do with petroleum.
The smaller one is a bracket to mount a CSF 8066 oil cooler on a round chassis tube. Would I be better off having it CNC milled out of aluminum?
![](https://s3.us-east-2.amazonaws.com/prod.mm.com/uploads/2023/03/13/1678732149_brack_mmthumb.jpg)
Markforged Onyx - carbon-infused nylon - is fine with gasoline exposure. I was just looking it up this morning :) I don't know what grade of nylon it is.
Oil cooler bracket should be pretty good printed, alhough I'd probably print both sides and clamp them together instead of a U bolt. Might want to put some rubber isolators on the cooler regardless.
wawazat
SuperDork
3/13/23 3:33 p.m.
PA 12 is the grade of polyamide (aka Nylon) used for automotive fuel lines and connectors.
j_tso
Dork
3/13/23 8:17 p.m.
In reply to wawazat :
Thanks, good to know!
In reply to Keith Tanner :
Good idea on printing it in halves. I'll probably also make the mounting portion taller and add a counter bore recess to completely fit the mounting boss on the cooler.
dps214
SuperDork
3/13/23 9:28 p.m.
I just did some googling out of curiosity. The markforged stuff is PA6, and it sounds like the bambu stuff might actually be a PA6/12 mix. They are definitely sensitive to moisture, the markforged printers have the reel holder inside a dry box and the reels come with dessicant to be replaced every time you swap reels.
The u-bolt mounting is probably fine, but you're going to want some kind of washer on those nuts either way. I would probably be hesitant to use it in a high vibration environment but I don't have much experience with that to know what it can actually handle.