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Re: Dual Extruders - 12 years ago

rhmorrison Wrote: ------------------------------------------------------- > Quotelister6520 > It seems the firmware sometimes loses track of the > absolute extrusion amount of each extruder during > a tool change. > > > You could switch to relative extrusion and avoid > the problem completely. That was actually the first thing I did but it just made things worse. Wel

by lister6520 - Reprappers

Re: Why does firmware use acceleration? - 12 years ago

Without acceleration the carriage needs to accelerate to the final speed within the distance travelled by two full steps (or half a complete cycle). If not then the first step, or even the first few might be missed. The same applies for deceleration. The higher the current applied to the coils the lower the chance of mis-stepping so an alternative to 'acceleration' is to apply a much higher than

by lister6520 - General

Re: Dual Extruders - 12 years ago

My printer can either use the E parameter and do tool changes to select which extruder to use or alternatively just use A and B parameters instead without any need for toolchange. With the latter one has to add the x and y offsets to compensate for the different locations of the extruders. With the E and toolchange the offsets are taken care of by one of the commands in the toolchange procedure

by lister6520 - Reprappers

Re: Dual extrusion problems - 12 years ago

I just came across this thread and thought to add my experience with dual extrusion. My machine is a Chinese clone (Flashforge Creator) of the Makerbot dual and I use ReplicatorG to process the STLs. This has a facility to combine two STLs into one gcode file for dual extrusion. Actually it slices the two STLs individually and then combines the two gCode files. However I've had lots of diffic

by lister6520 - Slic3r

Re: Need a simple stl - 12 years ago

Is this good enough ?

by lister6520 - General

Re: Stepper Motor jerking ( video ) - 12 years ago

I've just watched the video (it wasn't working for me earlier), and it somewhat confirms what I was thinking and perhaps also something else. I note the absence of the high pitch sound during the 'jerk' movement, which somewhat confirms that there was DC on the motor coil instead of a PWM signal. Also in steps 4>5 and 7>8 the pitch is distinctly lower, suggesting a PWM frequency which may

by lister6520 - General

Re: Stepper Motor jerking ( video ) - 12 years ago

I'm not familiar with Arduino as I usually use PIC but I think I can make some comments that are generic enough to be applicable regardless of what processor is used and hopefully still of some use. My guess is that you have something wrong either with the PWM output on pin 1 or the driver electronics it is controlling. Steps 8>1 and 3>4 are the only ones that put an 'analog' value rather

by lister6520 - General

Re: First important question from this newbie - 12 years ago

If a large buildspace is what you need then maybe you should contact these guys: They talk about metres rather than centimetres. Not sure they do plastic though.

by lister6520 - General

Re: Cold 3D Printing - 12 years ago

You could probably use a plastic and then melt it out instead of burning it. With PLA you could easily melt it out in an ordinary cooking oven, probably even ABS. Alternatively you could even dissolve it out by for instance making the positive in ABS and then dissolving it out with acetone. This may be preferable to melting as the acetone with dissolved ABS in it will more easily flow out of the

by lister6520 - General

Re: HIPS soluble support - 12 years ago

Was the ABS submerged for several months in the limonene or did it soften several months after having been removed from the limonene? I'm hoping it's the former as dissolving the HIPS would normally take less than a day and won;t pose a problem, but if the limonene continues to affect the ABS even after removal that will certainly be a problem.

by lister6520 - General

Re: HIPS soluble support - 12 years ago

Just got the results of the staining experiment. This was to find out how limonene itself affects ABS, or if it affects it at all. The result is that the limonene had no effect whatsoever as far as I can tell, so it seems limonene is very 'friendly' to ABS. The three black ABS samples were submerged in new clean limonene for over 24 hours, being given an occasional shake and some time in an u

by lister6520 - General

Re: Effects of slop between hobbed bolt and bearing - 12 years ago

The shank of a bolt is always meant to be slighlty smaller than the bolt diameter. Perhaps instead of using a bolt one could use an 8mm rod which will be exactly 8mm diameter and should fit snugly in the bearing. You may then need to cut a thread at one end to be able to secure the drive gear with nuts. You would need to use a mild steel rod rather than the hardened rods such as used for the c

by lister6520 - General

Re: New 3D Printer with integrated 3D Scanner - 12 years ago

"To achieve the same processing speed without cloud, we will provide an extra hardware that achieves similar cloud boost speed." I don't understand why one should need to buy extra hardware upgrade as a substitute for the cloud. We all already have extra hardware to do such processing, it is often known by names such as 'PC', 'laptop', 'notebook' or even just 'computer'. The 3D printer / scanne

by lister6520 - General

Re: HIPS soluble support - 12 years ago

@aduy The problem with PLA is that it does not stick well enough to ABS, or at any rate for me it doesn't, whereas ABS sticks to HIPS almost as well as it does to itself The solvent for HIPS is also safer even if much more expensive. If I could solve the ABS-PLA adhesion problem I would switch to that, especially if I don't find a solution to the staining problem.

by lister6520 - General

Re: HIPS soluble support - 12 years ago

It doesn't seem to attack the ABS as far as I can tell. When I use clean limonene (straight out of the bottle) I haven't seen any problem. The issue seems to appear only when I reuse the limonene - which I have to because it is costly. The more the limonene is loaded with dissolved HIPS from repeated use the worse is the staining. A few hours ago I chucked some pieces of black ABS in a jar wit

by lister6520 - General

Re: HIPS soluble support - 12 years ago

@JohnSL & aduy the thing is that the staining only seems to be caused by 'used' solvent. When I use the solvent the first time there is only minimal staining, if at all. I'm guessing that the HIPS dissolved in the limonene is what is causing the staining. However to be sure I am just now trying a little experiment - I've put three pieces of black ABS in a jar with new clean limonene and wil

by lister6520 - General

Re: HIPS soluble support - 12 years ago

@nophead The grey staining is indeed odd. I'm guessing it isn't just a matter of the dissolved HIPS being deposited but instead some sort of chemical reaction may be going on between the pigments of the two plastics. Or maybe it is just roughing the surface. I have just received a natural colour reel of HIPS, I'll try it out in the coming days. If the pigment is the problem then I should be OK wi

by lister6520 - General

Re: Drying nylon, in the microwave! DUH! - 12 years ago

The same will probably happen even at low power because reducing power just makes it cycle between full power and fully off. The nylon will puff up each time the magnetron turns on for a few seconds. What you can do instead is put in some soaked rags in a glass container in the microwave. The water in the rags will absorb most of the power leaving a smaller proportion of it to heat the water in t

by lister6520 - General

HIPS soluble support - 12 years ago

Hi, just a short introduction as I'm new here. I'm also new to 3D printing, having become interested a few months ago and got myself a Flashforge Creator in April this year. I'm not sure if it is well known, but it is essentially a Chinese clone of the Makerbot Dual with a few improvements (or perhaps just differences). I had originally meant to build a 3d printer myself and was shopping on eBay

by lister6520 - General