antti
New Member
Posts: 16
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Post by antti on Mar 23, 2017 22:13:01 GMT
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Post by 3dprintingmeathead on Mar 23, 2017 22:17:36 GMT
With 8mm per rev leadscrews, your layers should be in .04 increments(8mm/200steps), just in case the microstep loses position and the motor skips to the next full step.
So, .04, .08, .12, .16, .2, .24 etc.
I ordered some 2mm/rev lead screws, but I havn't installed them yet. But when I do, I would move in .01 increments.
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antti
New Member
Posts: 16
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Post by antti on Mar 23, 2017 22:30:03 GMT
Thanks! So the manuals showing basic settings 0.1 layer height really is not good
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Post by 3dprintingmeathead on Mar 23, 2017 22:33:46 GMT
Yea, the thing is, if it was moving constantly it wouldn't be a huge problem. But a lot of software will time out your holding torque after 30 seconds. Havn't figured out if marlin does or not though. But your z steppers, already splitting their driver's power between them, are fighting to hold the motor between 2 notches at .1mm layer height. if it loses the battle, it affects the print. But there's really no point in fighting it, it makes more sense to print under ideal conditions whenever you can.
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Post by kioskfan on Mar 24, 2017 16:24:13 GMT
With 8mm per rev leadscrews, your layers should be in .04 increments(8mm/200steps), just in case the microstep loses position and the motor skips to the next full step. So, .04, .08, .12, .16, .2, .24 etc. I ordered some 2mm/rev lead screws, but I havn't installed them yet. But when I do, I would move in .01 increments. You ordered new lead screws? I guess they come with new acme nuts. So the theory is it is easier to control more steps than fewer? Like your geared extruder.
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Post by 3dprintingmeathead on Mar 24, 2017 19:32:32 GMT
With 8mm per rev leadscrews, your layers should be in .04 increments(8mm/200steps), just in case the microstep loses position and the motor skips to the next full step. So, .04, .08, .12, .16, .2, .24 etc. I ordered some 2mm/rev lead screws, but I havn't installed them yet. But when I do, I would move in .01 increments. You ordered new lead screws? I guess they come with new acme nuts. So the theory is it is easier to control more steps than fewer? Like your geared extruder. Yup, new lead screws, they usually come with new nuts. They are 2mm per revolution and 2mm pitch single start, also called 2mm lead, depending on where you shop. The ones that come with the printer are 2mm pitch 4 start(look at the top of the screws, you can see 4 different threads cut in, hence 4start, or 8 lead, since the pitch of each thread is 2mm and there's 4 of them, 2*4=8mm per revolution. The microstepping creates a magnetic field to hold the position between 2 steps. So the motor is literally fighting against itself to hold that position. But you can change how much movement that step controls, so if it misses, it misses by a smaller margin. But if it does hold, it would also hold more accurately, because the window it has to hold it in is much smaller.
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Post by cipispe on Oct 14, 2017 11:33:35 GMT
Hello. If I change to 2 mm lead screws it is necessary to make any changes in the printer settings? Thanks.
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Post by tanephar on Oct 14, 2017 20:30:16 GMT
Hello. If I change to 2 mm lead screws it is necessary to make any changes in the printer settings? Thanks. Absolutely, you will have to calibrate the steps/mm for the z axis at the very least, with 2mm lead screws you would expect to take 4 times the revs to achieve the same distance. Base for 8mm lead screws is 400 steps/mm base for 2mm 1600 steps/mm. That's where I would start and then run a calibration with vernier calipers over 100mm, and tweak settings then using one of the calibration cubes from thingiverse run a calibration for the smaller movement. A good one is www.thingiverse.com/thing:1586206 it has the axis printed on it so makes it easy to work out where errors are occurring.
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Post by cipispe on Oct 16, 2017 4:38:31 GMT
Thanks a lot man. I just ordered 2 mm lead screws.
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