SoliForum - 3D Printing Community — Threads

Re: Threads

2015-08-24T03:36:21Z

I just ran an ABS white calibration step X100,Y100,Z50 print.
X- 99.74
Y- 99.84
Z- 50.08

Ive read that ABS can be .05%-.09% shrinkage. So .002" in a 1/4" thread should still be able to work.

But combine that w/ steps off, it wont thread.

Knowing this, better to adjust steps or just model w/ deviation ? or both ?

Re: Threads

2015-08-24T02:57:23Z

knucklbustr wrote:

Ive printed several internal threads. Anywhere from 1/4 to 3/4.
Prints alttle tight/small. And always have to chase them w/ a tap. Same w/ external screws.
If I scale them a small percentage, it changes the pitch. So that doesnt work.
Any luck printing threads w/out having to chase them ?
Maybe my XYZ step calibration off a smidge. Dunno, if its possible right off the bed.

When filament cools it has a shrinkage factor. It is different per roll. The best thing you can do is make a model of known dimensions with holes and print it when you load a new spool. Let it cool and measure it. The deviation would be the deviation you need to add or subtract from your model before you export to STL. Yes it is very common for us old timers to have to adjust our design dimensions. If you fudge by adjusting steps per mm on your Axis then it will be off on your next spool.

Threads

2015-08-24T01:56:37Z

Ive printed several internal threads. Anywhere from 1/4 to 3/4.
Prints alttle tight/small. And always have to chase them w/ a tap. Same w/ external screws.
If I scale them a small percentage, it changes the pitch. So that doesnt work.

Any luck printing threads w/out having to chase them ?

Maybe my XYZ step calibration off a smidge. Dunno, if its possible right off the bed.