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Re: Linear rail weight bearing capacity - 8 years ago
Quotedrmaestro Quoteepicepee I can't in good conscience read this thread and not recommend some good linear guides as an alternative to unsupported rods. That's exactly why I have posted this. I am trying to choose the right size of linear guides to replace my unsupported rods. Ah, sorry, I misunderstood. Most linear guides are massively overqualified. MGN9 (9mm) rails can take thousands of Nby epicepee - Reprappers
Re: CoreXY or Moving Bridge with fixed bed which way to go for large parts - 8 years ago
Delta printers do not make asymmetric parts, unless they are calibrated badly. If well-done, a delta printer can move its effector to any point, just like a CoreXY or gantry setup.by epicepee - CoreXY Machines
Re: 2020 Profile slider was a carriage? - 8 years ago
That looks expensive, especially for the performance which is ultimately limited by whatever polymer they have sliding. I'd guess you'd get better precision and reliability with a linear guide bolted to the extrusion.by epicepee - CoreXY Machines
Re: [idea] CoreXY "+" - Alternative to "H" arrangement, keeping CoreXY belt - 8 years ago
If you're willing to add a second gantry, you can just use the Ultimaker's setup, where each gantry is controlled by a single motor through a driveshaft and a pair of rods: (Note that here, the linear rods double as driveshafts; this is not necessary.) This setup should be simpler and should introduce less elasticity, as well as allowing the use of non-Core-XY-compatible firmware.by epicepee - CoreXY Machines
Re: Linear rail weight bearing capacity - 8 years ago
I can't in good conscience read this thread and not recommend some good linear guides as an alternative to unsupported rods.by epicepee - Reprappers
Re: Did I brick my Printer? - 8 years ago
It's not possible to brick a printer -- they can always be fixed! What sort of printer is it? Can you get to the electronics? If so, is the LCD cable still seated properly?by epicepee - General
Re: Dual drive gear extruder - interest and experience - 8 years ago
This sounds like a very interesting idea. I have had chronic slipping and grinding issues, especially with the long retraction that accompanies a Bowden tube, and I'd love to increase reliability.by epicepee - General
Re: Filament measuring thingy - 8 years ago
That's a very interesting idea! I bet if the speakers aren't enough, you could use a squirrel-cage fan and a barometer.by epicepee - General
Re: Has my Arduino board died? - 8 years ago
That sounds like something is up with the stepper drivers, most likely not enough current. Have you tuned their current?by epicepee - Reprappers
Re: Servolulu: Polulu-compatible servo motor driver - 8 years ago
Are the schematics available?by epicepee - General
Re: Servolulu: Polulu-compatible servo motor driver - 8 years ago
QuoteLoboCNC [the PWM signals for a servo amplifier are different from the RC-type PWM signals used by ESC drivers. That makes sense. I suspect a simple adapter could be used, though. Or we could just use an open-source ESC like VESC or Open-BLDC and adapt it for use with the different signal. QuoteLoboCNC Also, it's not quite clear if or how you can do position control with an ESC controlby epicepee - General
Re: Availability of 32 bit controllers - 8 years ago
MKS SBASE Smoothieboard clone is also available. It's cheaper than the Smoothieboard (~$80) and has five stepper drivers, but comes with the standard Chinese-clone quality control.by epicepee - General
Re: Servolulu: Polulu-compatible servo motor driver - 8 years ago
This looks awesome! I can't wait to test it! Suggestion: Correct me if I'm wrong, but at the moment it has a brushed motor controller built in, right? An option to remove the DC motor controller, and just expose a single PWM wire for motor speed, might be nice. This would allow people to use e.g. hobby-style brushless ESCs and motors, or boards with multiple motor controllers in one.by epicepee - General
Re: SBR16 linear rails - 8 years ago
QuoteMKSA The 15mm Japanese will do the job a the two 9mm Chinese that you will need and without the hassle of installing them perfectly //. Very true. That's the best argument I've heard for the larger rails. A Chinese 12mm or 15mm rail might still be cheaper, though; I'll have to do some searching. QuoteMKSA Anyway, why don't you LEARN from engineering books and mfg publications insteadby epicepee - Developers
Re: LCD controller board - 8 years ago
Undermentioned: Don't just buy one if you can make one! You'll learn more this way.by epicepee - Reprappers
Re: multiple A4988 control - 8 years ago
Quotedc42 Bear in mind that the motor current will be turned off when you disable the driver, so the associated motor will not hold position. Right. If you want to avoid that, put a transistor between the step pin of each driver and the "universal" step pin, and wire your control wires to the transistors instead of to the enable pins.by epicepee - Developers
Re: SBR16 linear rails - 8 years ago
While that's a good deal, this is still half the price, for (almost) the same length. While I appreciate well-made hardware, I don't want to use a Japanese 15mm rail if a Chinese 9mm will do.by epicepee - Developers
Re: SBR16 linear rails - 8 years ago
the_digital_dentist: The reason I might use 9mm rails is price, they seem cheaper than 12mm. I would bolt them to a support, probably a 1" square aluminum tube, so the strength of the rail itself isn't a huge issue.by epicepee - Developers
Re: SBR16 linear rails - 8 years ago
That's what I was thinking, but 9mm is pretty damn tiny. I feel like if they were enough, people wouldn't use the 12mm rails as much as they do.by epicepee - Developers
Re: SBR16 linear rails - 8 years ago
the_digital_dentist: Yes, but it's hard to tell exactly how much force the printer will exert on the rails, or exactly how the rails behave as they approach their limits, without some testing.by epicepee - Developers
Re: SBR16 linear rails - 8 years ago
How well do MGN9 rails hold up? Is that large enough?by epicepee - Developers
Re: SBR16 linear rails - 8 years ago
Perhaps this would help reduce moving weight? Or just use SBR12's, which are still certainly strong enough and would be much lighter.by epicepee - Developers
SBR16 linear rails - 8 years ago
I've been on the lookout for cheap, rigid linear motion for a while. This appears to fit the bill. Two 500mm rails and four blocks for $57.34 shipped. The rails are 16mm ground steel rod, supported with aluminum extrusion. The bearing blocks have openings matching the rod. To be clear, I know that Aliexpress rail won't be as good quality as "proper" rail off Misumi or something. But betweenby epicepee - Developers
Re: Pressure advance in Slic3r - How to use? - 8 years ago
Where do you find the setting? A positive number should correspond with more advance, i.e. compensating for more elasticity.by epicepee - Reprappers
Re: faster slicing - 8 years ago
Slic3r can take stl, amf, and obj. However, I'd guess the slowness comes from the slicing itself, not importing the model.by epicepee - Reprappers
Re: Extruder advance in repetier-firmware - 8 years ago
Not yet, sorry... I tried messing with K and it had no noticeable impact from 0 to ~100.by epicepee - General
Re: Echo:Active Extruder : 0 - 8 years ago
What is the problem? Does the printer work?by epicepee - Reprappers
Re: Saving the RepRap Project - 8 years ago
Take E3D. They have open-source designs, and the clone market is awash with $10 "E3D" hotends. And yet E3D is still a viable company, innovating and introducing new products. How? I'm not totally sure, but they seem to have maintained a few things. One is that people are aware that clone hotends just don't work as well as the originals. There are countless examples of people buying the cheaby epicepee - General
Re: This $99 Gadget "OLO" can transform any Smartphone into a 3D Printer - 8 years ago
The distance between the LCD and the surface of the glass will destroy resolution. Also, most (all?) smartphones use LED-lit screens, which emit little to no UV, so have fun dealing with the visible-light-sensitive resin!by epicepee - Crowdfunding Projects Announcements