Quotereifsnyderb Since I am also a computer programmer, I have a document management system that I am about to release for Wordpress. I think it will do pretty well. Afterwards, I might apply for some trademarks and build on the J-Head Mk 8's and Mk 9's so as to sell them as premium hot-ends for somebody who'd like something that works right out of the box and is willing to pay extra for qualiby Garry Bartsch - RepRap magazine
Quotethe_digital_dentistHere's what I use- it's designed for a 6-32 screw/nut. Turning the screw pulls the pulley and tensions the belt. The screw head only rotates- it pulls the nut toward it, so it never sticks out where it can snag on anything. Nice design. I did something very similar for my M90 variant.by Garry Bartsch - Look what I made!
Nice!by Garry Bartsch - Look what I made!
Very nice. I've bookmarked your blog.by Garry Bartsch - Look what I made!
By any chance could you post a picture? That might help someone spot the trouble?by Garry Bartsch - Mendel90
It's funny. The machine is not exhibiting this behavior now. It suddenly just stopped and I haven't felt like testing other versions of Slic3r or other slicers to try to repeat the problem. 1.2.6 us working very well. So when I have more time I will test other slicers but for now all is good.by Garry Bartsch - Slic3r
I ordered a bunch of 1.9mm thick picture framing glass. It works flawlessness despite being thin. Never breaks. And because it is thin the weight of the Y carriage is reduced. I did tear out chunks of glass when removing parts printed with ColorFabb XT and Taulman T-glase; they adhere brutally. Likely I should have turned down the temp of the heat bed. Float glass has been fine for me.by Garry Bartsch - Safety & Best Practices
When I start a print my Mendel90 makes a very brief 'grinding' sound (sounds like 'grrrkk') just as the X carriage begins it's descent from homing at the top. It's a split second long but very disconcerting! Happens every time. This is Slic3r 1.2.6 experimental x64. It doesn't happen in version 1.1.7 stable. It also doesn't happen when I slice with a different slicer. Any ideas what might causeby Garry Bartsch - Slic3r
I finally printed a few of these tabs in Ninjaflex. While not as cosmetically perfect as the PLA (there are stringers on the Ninjaflex parts) they are flexible and slightly grippy. The grip will be nice but the flexibility will be the best aspect. They will save my wrists, elbows and shoulders since they will absorb shock each time I hit them as I push. Plus if I ever run into a hard surface withby Garry Bartsch - Look what I made!
Is that a CFL bulb? An old style incandescent would get even warmer if yours is a CFL. Using a heat bulb would really warm things up.by Garry Bartsch - Look what I made!
Some commercial printers come with four bearings (Printerbot is one that comes to mind right away). A friend has a RepRap with four on Y and he claims it experiences zero binding. I am designing a RepRap with a Y carriage that can use four or three bearings. First I will try four. If that doesn't work I can easily switch to three. Correctly aligned I believe four should work just fine. At least Iby Garry Bartsch - Mechanics
I like it. Looking forward to hearing (seeing pics would be nice) how it prints.by Garry Bartsch - Look what I made!
Thank you cdru. That is more good information and is really helping me get a grasp on these issues. I read the catalogue and looked up some of the alternate connector manufactures you mention. Electronics is a big field!by Garry Bartsch - Controllers
QuotecdruAlso, Molex is just a brand name. Saying that a Molex connector is better suited for a job doesn't mean anything unless you state which Molex connector. Yes. I guess I'm just wondering if Molex is known as a highest quality brand? Or do other manufacturers make products with the same or higher quality? Molex certainly has name recognition going for it.by Garry Bartsch - Controllers
QuotecdruIn other words, in a 20°C room, you can expect to get at least Ihold but not more Itrip on a sustained basis. Thanks for elaborating. And as the ambient temperature rises both of those numbers would go down? In my case in summer my room with the printer gets hot: 28-30C sometimes. So a fan would definitely be needed I think.by Garry Bartsch - Controllers
QuoteCefiarNote: I've successfully used Phoenix removable screw connectors (the two-part ones) in place of the standard screw connectors. Thanks. I searched the Phoenix website but there are a lot of connectors so I wasn't sure which one you mean. But I could see the Pheonix were more robust looking connectors. I'm guessing that different RAMPS manufacturers use different terminals? Would theby Garry Bartsch - Controllers
Perfect explanation dc42. Thank you!by Garry Bartsch - Controllers
Thank you for those answers. Sorry I am slow to reply. The PDF shows a trip rating of 18.7A beside the 11A holding rating. So the fuse would trip at 18.7A? But I assume it would not trip instantly at this amperage due to it's construction. Are all screw terminals created equal? Or could better ones be soldered in to the RAMPS?by Garry Bartsch - Controllers
Thank you for those answers. I just did the calculations and I get it now. The cross section of 28AWG is 0.0810mm so times 12 is 0.972mm which is just less that the 32/0.2 (17AWG) wire that completes the cabling. So as long as I use 17AWG or thicker to complete the ribbon cable all should be fine.by Garry Bartsch - Mendel90
I bought a 26 way 28AWG ribbon cable off eBay but when I twist 12 wires together for the heated bed the resulting bundle of wires seems smaller than I remember in the kit. Does the kit use 26AWG? Finding a 26AWG 26 way ribbon cable on eBay isn’t proving really easy.by Garry Bartsch - Mendel90
So that 11A is the holding current? What amperage will it trip at? If your polyfuse didn't trip pulling 15A then mine shouldn't at 12-ish, granted polyfuses are all the same. But say I did wire in a 15A car fuse. It would not trip till 15A but what would get hot before it did? The copper traces on the PCB? At what amperage will other stuff on the board definitely start getting fried? The cheapby Garry Bartsch - Controllers
Quotethe_digital_dentistIt's pretty good, but I am always striving to make it better. More photos of the printer and some recent prints for the SnakeBite extruder here: https://drive.google.com/drive/#folders/0BxckS0Y4E9lzN1hlOGtaeUdZcUU Very nice prints. That is a cool extruder. I am fascinated by how many different ways people can accomplish the same task. I guess that is the beauty of RepRaby Garry Bartsch - Mechanics
Yes, I am going to use your ribbon method from the heated bed to the frame base, and then wires to the controller. Sorry, I should have mentioned that. Your method is working perfectly on my current machine! Curiously, for the wire section, is it OK if I use a thicker wire for the positive than the negative? Or must they be the same? That's just because I have wires in different sizes now. And aby Garry Bartsch - Mendel90
Sweet! Thanks Chris. Now as long as I use good thick cabling to the bed I'm thinking the heated bed loop should be fine.by Garry Bartsch - Mendel90
Quotenophead Yes, interesting the smaller surface mount version can handle a little more current than the through hole T0220. Thanks! Then I will get a few of these and upgrade the MOSFETs for a fun soldering exercise and a bit more peace-of-mind. The surface mount MOSFET of the Melzi is smaller but has no heatsink so I am assuming the larger through hole MOSFET could live without a heatsink asby Garry Bartsch - Mendel90
QuoteCefiarI replace all the motor connectors on the PCB with Molex locking connectors, to avoid the motors being disconnected accidentally. They use the same type of pins on the PCB, but have a locking arrangement on them. You have to cut off the old connectors from your cable and replace those, but IMO it's worth it. I list that here, as MOST Pololu boards I've seen do not have locking connectoby Garry Bartsch - RAMPS Electronics
QuotenopheadA 10A bed doesn't trouble them! And that is why I love my Mendel90; it surely doesn't give trouble. The heated bed just cranks up hot; and I never even knew it could cause problems for the electronics until I learned some people have issues with other machines! That's the way it should be. For RAMPS which needs three pins would this be a similar MOSFET? FDP8870 I assume the 156A isby Garry Bartsch - Mendel90
Hi Neil, Thank you for that excellent information about MOSFETs. Again, lacking any background in electronics, it has taken me a while to digest the technical considerations you mention. While not fully understanding everything you write about the switching threshold value I think I have grasped MOSFET basics. 1) Cheaper MOSFETs will have higher resistance and therefore get hotter. This might/wby Garry Bartsch - Mendel90