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Posted: 6/2/2024 5:03:29 PM EDT
My neighbour has an ancient husky brush saw that he lost the gas cap for.
They are made from unobtanium apparently and if I can figure out the thread size, pitch it wouldn't take long to make him one. |
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Posted: 6/2/2024 5:57:41 PM EDT
[#1]
PETG would be impervious enough. Worst case you make him a new one in 5 or 10 years
The original is probably abs or nylon. |
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Posted: 6/2/2024 7:18:27 PM EDT
[#2]
Quote HistoryOriginally Posted By Tholo: PETG would be impervious enough. Worst case you make him a new one in 5 or 10 years The original is probably abs or nylon. |
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Posted: 6/2/2024 8:21:47 PM EDT
[#3]
Maybe he won't lose that one
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Posted: 6/2/2024 8:22:29 PM EDT
[#4]
PETG. Be aware GITD filaments are abrasive and the GITD bits may not have the same impervious properties. Best to make it pure PETG.
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Posted: 6/2/2024 9:01:48 PM EDT
[#5]
Quote HistoryOriginally Posted By Tholo: PETG would be impervious enough. Worst case you make him a new one in 5 or 10 years The original is probably abs or nylon. I thought that and made some caps for my gasoline cans out of PETG. They would last a week or so each. |
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Posted: 6/2/2024 9:25:45 PM EDT
[#6]
Quote HistoryOriginally Posted By GlutealCleft: I thought that and made some caps for my gasoline cans out of PETG. They would last a week or so each. Sure you had pure PETG? I've made a ton of stuff and never had an issue. |
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Posted: 6/2/2024 9:39:54 PM EDT
[Last Edit: Tholo]
[#7]
This question does come up a lot. The conventional wisdom is petg for chemical resistance.
 Attached FileHere's 92 octane nonoxy gasoline with petg, petg cf, asa and nylon filaments. They're not in direct contact with the fuel. The lid isn't sealed so it won't build pressure. |
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Posted: 6/2/2024 9:42:22 PM EDT
[#8]
I have oiled the f out of my PLA tough Glock frames, shot them for 400 rounds.
2 years later still showing no signs of degradation. |
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Posted: 6/2/2024 10:40:25 PM EDT
[Last Edit: Tholo]
[#9]
Functional print Friday on YouTube went through some of his prints that had been in service for years. All PLA I think.
This guy is basically doing the same experiment I kicked off. I haven't finished the video yet.  PETG 3D Printer Gasoline and Acetone Test Go to about 11:00 for the results. He includes chapters in the video, which is nice. Surprising result, the petg absorbed the gas. It looks like it would disintegrate eventually. PLA held up better to the gas over the 8 hour test. |
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Posted: 6/2/2024 11:07:13 PM EDT
[#10]
Pa12 is also resistant to oils
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Posted: 6/3/2024 12:18:08 AM EDT
[#11]
Quote HistoryOriginally Posted By bionicmonkey: Pa12 is also resistant to oils Doesn't that require a high temp enclosure to print? |
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Posted: 6/3/2024 1:33:56 PM EDT
[#12]
Quote HistoryOriginally Posted By SandHillsHillbilly: Doesn't that require a high temp enclosure to print? Quote HistoryOriginally Posted By SandHillsHillbilly: Originally Posted By bionicmonkey: Pa12 is also resistant to oils Doesn't that require a high temp enclosure to print? Op didnt state any reasonable limits.. its not like peek or pekk.. 280f and hardened nozzle. |
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Posted: 6/3/2024 5:04:31 PM EDT
[Last Edit: Tholo]
[#13]
Nylon needs to be dry dry dry. (Nylon is polyamide, PA. There are a couple of common types)
PA12 is less sensitive to moisture than PA6. I don't think it needs an enclosure to print, but I've never tried without. |
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Posted: 6/3/2024 5:12:36 PM EDT
[#14]
Quote HistoryOriginally Posted By Tholo: Nylon needs to be dry dry dry. (Nylon is polyamide, PA. There are a couple of common types) PA12 is less sensitive to moisture than PA6. I don't think it needs an enclosure to print, but I've never tried without. Yes you'll want an enclosure for nylon. Otherwise it will try to outwarp Hunter Biden's mind. |
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Posted: 6/3/2024 7:28:39 PM EDT
[#15]
Quote HistoryOriginally Posted By -Obsessed-: Yes you'll want an enclosure for nylon. Otherwise it will try to outwarp Hunter Biden's mind. |
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Posted: 6/3/2024 9:28:54 PM EDT
[#16]
Quote HistoryOriginally Posted By -Obsessed-: Yes you'll want an enclosure for nylon. Otherwise it will try to outwarp Hunter Biden's mind. Quote HistoryOriginally Posted By -Obsessed-: Originally Posted By Tholo: Nylon needs to be dry dry dry. (Nylon is polyamide, PA. There are a couple of common types) PA12 is less sensitive to moisture than PA6. I don't think it needs an enclosure to print, but I've never tried without. Yes you'll want an enclosure for nylon. Otherwise it will try to outwarp Hunter Biden's mind. Havent had that experience with polymaker. I run pa6 at 300 but the enclosure open. |
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Posted: 6/3/2024 10:00:16 PM EDT
[#17]
Quote HistoryOriginally Posted By bionicmonkey: Havent had that experience with polymaker. I run pa6 at 300 but the enclosure open. What size parts? And what bed surface and bed prep? CF or regular? I forget which brand I used but it was a Taulman (sp?) alloy of some type. |
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Posted: 6/4/2024 9:42:23 AM EDT
[#18]
I don't have an enclosure..I have a redneck dryer..
It actually works very good for keeping the filament dry.  
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Posted: 6/5/2024 10:23:55 PM EDT
[#19]
It's been a couple of days since I put the filament samples in the gasoline. The last 40 hours they were in direct contact with the gas.
They all seem the same as when they went in. Not squishy or brittle.  YMMVPETG, PETG CF, ASA, AND PA6 Nylon. |
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Posted: 6/23/2024 11:34:56 AM EDT
[#20]
ABS most certainly is not. Gas can cap printed from ABS had a little to good of a seal and this is the result.
 Attached File |
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Posted: 6/23/2024 3:40:09 PM EDT
[#21]
Quote HistoryOriginally Posted By -Obsessed-: What size parts? And what bed surface and bed prep? CF or regular? I forget which brand I used but it was a Taulman (sp?) alloy of some type. Quote HistoryOriginally Posted By -Obsessed-: Originally Posted By bionicmonkey: Havent had that experience with polymaker. I run pa6 at 300 but the enclosure open. What size parts? And what bed surface and bed prep? CF or regular? I forget which brand I used but it was a Taulman (sp?) alloy of some type. I've run Polymaker PA12-CF without an enclosure. 280C for nozzle, 50C for bed (225x225). Filament is dried for 12+ hours at 70C. Hardened steel nozzle as well. I get some shrinkage, but it's pretty minimal, probably around 2% and I'm thinking I could fix that with Cura settings (vertical and horizontal scaling). I've only used it for small parts though (less than 2" cube size). |
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