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Re: Rugged CoreXY - 8 years ago
Holes are not what align linear rails (installed according to the specs you mentioned). Hiwin (as well as THK, IKO, SKF and several others) describe proper technique which is a machined lip for the bearings to rest against. It's not just the location of the holes, but the flatness of the surface you need to be concerned about. This is also specified in installation instructions, you can find tby Koko76 - CoreXY Machines
Re: How do you print with your Duet? Web or USB? - 8 years ago
I've technically used both. I have an intel NUC set up with a 10" touchscreen next to the machine. When I started testing the Duet I used pronterface and USB. Printed a bit over that with no issues. After I got the ethernet hooked up I only use the web interface. I slice on the laptop, upload to the SD card and either kick it off from the laptop or from the NUC. While printing I adjust fromby Koko76 - Duet
Re: Duet development news - 8 years ago
Quotedc42 QuoteKoko76 Not sure if you've covered this elsewhere, but what kind of max step rate do you expect out of the new board? We have yet to measure it, and it needs some new firmware written to make use of architectural improvements we have made to allow faster stepping. We are aware that some users want to use 64x or higher microstepping drivers without sacrficing travel speed, and we'veby Koko76 - Duet
Re: Duet development news - 8 years ago
Not sure if you've covered this elsewhere, but what kind of max step rate do you expect out of the new board?by Koko76 - Duet
Re: Would 300x300mm glass plate bow if only supported by the 3 screws for leveling? - 8 years ago
Quoterealthor QuoteSrek Get rid of the glass, use a thicker plate made from cast aluminum and milled from both sides. It will warp very little, especially if you fix it in a way that it has a bit of give. Use gluestick or 3dLac to make prints stick. I've found this, which isn't too expensive... Would this be good enough? http://www.ebay.de/itm/121254993166?clk_rvr_id=1035323292601&rmvSB=truby Koko76 - General
Re: Need help deciding if I should get this printer! 
- 8 years ago
It's hard to answer the question without knowing you, your skills, and your tools and equipment. What works for someone with a lot of experience might be miserable for someone who doesn't. Only you can determine your level of comfort with a particular task. If the thought of assembling something successfully without a step by step guide, a troubleshooting section and a support staff ready to aby Koko76 - General
Re: Why Spindle driven Delta's are more precise than Belt Driven - 8 years ago
Quoteevandene All, Traveling from A B with a stepper driven system Works well if no speed or accurate positioning is required. Please do following test with your delta printer; 1) go from A to B in Z height like 25 mm (1") and measure the real distance. Most probably all it's within a few hundreds of a mm. 2) do this again but now Z= 0.1mm (0.00393"). Asuming you use micro stepping of 1/16 or 1/by Koko76 - Delta Machines
Re: Why Spindle driven Delta's are more precise than Belt Driven - 8 years ago
Quotebgkdavis QuoteKoko76 It's not shocking, and it has been "though of before". Sometime I forget that sarcasm is wasted on those who speak English as a foreign language It's Ok dude, sometimes I forget that posting useful information like links to websites with good practical information is wasted on those who would rather be smart mouthed jerks. You have a lovely one ok bud.by Koko76 - Delta Machines
Re: Why Spindle driven Delta's are more precise than Belt Driven - 8 years ago
It's not shocking, and it has been "though of before". I want to say there is video of a screw based delta around somewhere, I want to say there is one by Seward. Pretty sure I've also seen video of a screw based 6 axis delta somewhere too. There are ballscrew (and leadscrews of various types) with higher leads as well, so the resolution of the system can be tuned for the desired step ratesby Koko76 - Delta Machines
Re: My coreXY design is progressing to the build stage - 8 years ago
That is not how a twist drill bit works, and it is unsafe to do that. If all you have is a drill bit, cut a series of holes from the side smaller than the desired hole, using the bit the way it was designed to cut. Then file the slot to size.by Koko76 - CoreXY Machines
Re: linear rods VS aluminum extrusions and pulleys - 8 years ago
Quotebgkdavis Quotehercek My preference for linear rod over linear rails is easy to explain. I do not want to buy this stuff from a shop which does not specify tolerances. Rod manufacruers specify tolerances because rods have a huge range of uses where the tolerance is critical, this is not true for rails, the only dim thats normally toleranced is the mounting heights. Not sure what rails you aby Koko76 - Delta Machines
Re: Inverted FFF printer - 8 years ago
Support structures would have to be done differently, you can't count on plastic falling onto them for a looser bond. Gravity will cause semi soft plastic to sag down towards the print head in addition to the curling effect that can happen with a traditional setup. It would be interesting to try, but I worked through these and a few other downsides before coming to the conclusion it wasn't worthby Koko76 - General
Re: PLA vs. health - how it's dyed? - 8 years ago
You will almost certainly not have anyone tell you that the colorants are made from beets, oranges or bananas. Colorants are selected based on cost and compatibility with the underlying resin. Some colors don't work well with some resin types. If colorants concern you that greatly get some "natural" or otherwise unpigmented plastics. There's still nothing to definitively tell you that the undby Koko76 - General
Re: Is Nema17 1.2A too weak for 3d printing? - 8 years ago
Quotelkcl QuoteKoko76 It's almost like they wrote a document, to which you keep referring but refuse to read. In that document they call out a minimum recommended pulley size for GT2 pulleys, and surprise it happens to be 16t. Same document talks about speed as well. It's on the website (www.sdp-si.com), and available freely. Perhaps you might consider reading it before dispensing theory. okby Koko76 - CoreXY Machines
Re: Is Nema17 1.2A too weak for 3d printing? - 8 years ago
Quotelkcl Quotecozmicray ikcl There you go again i've sent you a private message, cozmicray. Quote What are timing belt issues doing in a topic about NEMA 17 current draw? BTW the more contact (wrap) of a belt on a pulley is better for power transmission keeping in mind that the belt has to be able to withstand a sharp bend by a small diameter pulley. ... and that the load on the belt is disby Koko76 - CoreXY Machines
Re: Is Nema17 1.2A too weak for 3d printing? - 8 years ago
Quotelkcl QuoteKoko76 "watch out for that, though: *don't* wrap the corexy belt through 180 degrees round GT2-16t's. put an idler bearing in (or two) so that the belt loops back on itself through 90 degrees instead." Complete and total nonsense. i believe i warned you before a couple of days ago, koko76, but let me be more clear: your words here are hurtful and cause me distress that you shouldby Koko76 - CoreXY Machines
Re: Is Nema17 1.2A too weak for 3d printing? - 8 years ago
"watch out for that, though: *don't* wrap the corexy belt through 180 degrees round GT2-16t's. put an idler bearing in (or two) so that the belt loops back on itself through 90 degrees instead." Complete and total nonsense. I have >180 wrap on 15t GT2's Worked just fine for many hundreds of hours so far.by Koko76 - CoreXY Machines
Re: Effector moving up/down slightly during horizontal moves - 8 years ago
Quoteverdesmarald Hi dc, I'm confused about the second part of your post, the pages on the Pololu website for the A4988 say the current limit is 2.5 times the VREF setting for both the black and regular editions, why would the real current only be half that amount? Also I am not sure what a sense resistor is, or if mine are 0.1 or 0.05 ohms, sorry. When you check "vref" you are checking the volby Koko76 - Delta Machines
Re: corexy with 2 or 3 direct drive extruders - 8 years ago
If you can get both for he same price, and the ballscrew is of passable quality go ballscrew. Better efficiency and typically better precision. Either way, if using for x and y you will need to deal with backlash inherent in both. Frequently this is done with two nuts that are spring loaded against each other.by Koko76 - CoreXY Machines
Re: Foldable, portable CoreXY (Fusebox derivative) - 8 years ago
I have no desire to do work for you in order for you to perform a "comparative engineering quality control analysis". I don't print at those sizes or layer heights. If parts that my printer made looked like that, I would not be claiming that those speeds were valid. Makes zero difference to me what your design is, I just look at the output. Your opinion is different, it's your machine and yoby Koko76 - CoreXY Machines
Re: Infill Uses Two Axis - 8 years ago
Right, so if you want to increase the infill speed above the perimeter speed, change the "0" to something >50. Unless your printer can't move more than 50mm/s in a single axis changing the direction here will have very little impact. As suggested above, accell and jerk can play a role here, but at the speeds you are taking about the effect is pretty negligible. Also keep in mind that a hotby Koko76 - General
Re: Foldable, portable CoreXY (Fusebox derivative) - 8 years ago
Mm/sec^2 is the unit you are looking for. To each their own, but I consider none of that to be acceptable print quality.by Koko76 - CoreXY Machines
Re: Infill Uses Two Axis - 8 years ago
Quotem.ratcliffe Thanks for the replies I appreciate it, I will try a few prints with the setting changed and see how it effects print time. If I am understanding the theory correctly, by using two axis im printing the infill 1.4 times faster with the same motor speed Good to know. No, that is only correct if the axis were moving at their speed limits before you switched the angle. As I saidby Koko76 - General
Re: Foldable, portable CoreXY (Fusebox derivative) - 8 years ago
What is your acceleration set to?by Koko76 - CoreXY Machines
Re: Infill Uses Two Axis - 8 years ago
The infill will print faster if you set it to print faster. Using one axis or two doesn't specifically make a difference to the speed here. In cura this is in the advanced tab under infill speed. If it's set to 0 it will print the same as the perimeter speed. I don't think that cura lets you change the angle of infill. Simplify lets you set whatever angle/angles you want for both infill andby Koko76 - General
Re: Duet for Hbot - 8 years ago
Super, thanks David. I'll let you know if I run into any.by Koko76 - Duet
Duet for Hbot - 8 years ago
Building an Hbot, and I'm wondering if the duet's motion solution for corexy will work. It "looks" like the same motion commands will work, but I'm not 100%. Not looking to know why I should choose something other than Hbot, just want to know if the code works out of the box, or if I have to wrench on it.by Koko76 - Duet
Re: What is your experience with dual hotends? Are they worth the trouble? - 8 years ago
Quoterealthor QuoteJamesK I don't think I'd want to try and use a lock nut to set the final height of a threaded throat. Do you expect that one will not be able to fasten the nut without moving the threaded barrel just enough to invalidate the level of the 2 nozzles? Do you expect vibrations to affect such fastened jam nut? Is there any other reason? I fail to see any difference with regardsby Koko76 - General
Re: What is your experience with dual hotends? Are they worth the trouble? - 8 years ago
QuoteJamesK *drool* I want me some toys like that. Oops, sorry, I think my enthusiasm is showing again... Job perks. All kinds of toys and they pay me too.by Koko76 - General
Re: What is your experience with dual hotends? Are they worth the trouble? - 8 years ago
Last one I priced was in the 175-200k range.by Koko76 - General