Maybe its the word "backlash" that I'm not understanding in terms of the print? I don't see backlash in something that is printing in a straight line and only the perimeter is being overlapped a little.. the backlash would have to take place at the ends as it reverses itself. The lines in the images appear to be straight and consistent as it prints in the x and y direction, just containing a gapby ampapa - Printing
@thedigitaldentist, in terms of backlash what are you referring to? I think you're referring to how far past it prints into the border? When I said "not filling the space", maybe I should have said the lines aren't being "flattened" enough. Thanks.by ampapa - Printing
Quotethe_digital_dentist The gaps you see in the third image are due to backlash in the XY mechanism. Notice that the gaps occur between every other line. The extruder should be moving equal distances with each reversal of direction, but it isn't. It's either moving too far, or not far enough, every other layer.. I think I understand what your saying but I'm not sure I understand what it shouby ampapa - Printing
@thedigitaldentist it looks to me like the top layer(s) has gaps is that a function of under extrusion, that 3rd picture has a good look at it... is it possibly to have both in the same print? Also, any ideas about the detail and how to sharpen it up? I assume that is a function of the layer height? ampapa,by ampapa - Printing
I needed to print some switch brackets for my CNC and so I pulled out my corexy printer zero'd up the axis and got to printing but I have some issues and don't really know what the best course of action is to resolve them and where to begin. I used S3D for this print printing PLA at 185, .4 nozzle, .25 layer height, 2300 retraction speed, .95 Extrusion multiplier, 17% infill, 3600 print speed.by ampapa - Printing
Then maybe a different worm??by ampapa - CoreXY Machines
Quote691175002 For example looks plausible but has no description. I think the concept @the_digital_dentist was trying to accomplish was an affordable worm gear solution, at $190 for a gearbox I think I'll use one of my Rino's.. Now at $38+shp it gets back into reasonable... @the_digtial_dentist, it certainly is a repeatable issue... ampapa,by ampapa - CoreXY Machines
@691175002 seems like a worthwhile investment if it can hold up what the @the_digital_dentist was throwing at it. Do you have a link to share for the gears? ampapa,by ampapa - CoreXY Machines
Ah, now that makes sense thanks for the additional insight. I'm curious now then what the cost is for some precision ground gears...?? It has to be cheaper than the OnDrive unit itself. Precision gears Seems like that is whee the cost of the unit should be spent.. ampapa,by ampapa - CoreXY Machines
So that's curious for sure. Is that image a picture of the part on its side? I'm trying to understand the mechanics behind ribbing and how is that being caused. ampapa,by ampapa - CoreXY Machines
There is a great interview from Thomas Sanladerer at MRRF2018... E3D Tool Changer ampapa,by ampapa - CoreXY Machines
@the_digital_dentist, the unit in your drawing looks different than the one you mounted to UMMD... Is the weight restriction that yor're experiencing related to the stepper you're using or the design? The only problem I see with mounting the stepper above the unit is with space in the Z Axis. With the unit parallel to the build plate I think you'll get more room... Looking forward to playing wby ampapa - CoreXY Machines
Thanks for the reply's. Seems that the most rigid designs involve supporting the post at the top and bottom so I think I'll have to work that into the design somehow. @the_digital_dentist I'm thinking something along the lines of your design... a caged concept. ampapa,by ampapa - Mechanics
hmmm ... yeah I was thinking that while I was drawing it. I think this is a picture of the CubeX? I was thinking a little beefier.. this is from E3D's new concept and Thomas Sanladerer's interview. That plate is thick but lacks a 3 point design... The only way to avoid it is to go with a setup similar to yours where the rails face each other on the Z axis. ampapa,by ampapa - CoreXY Machines
I was working on an idea/design for a new build plate support for my CoreXY and wanted some feedback, thoughts or suggestions?. My intent is to bend the support structure from aluminum 5m / 3/16 or thicker. I'm not sure if I can get an accurate bend on thicker material heck I'm not sure if I can get an accurate bend on thinner material... ampapa,by ampapa - CoreXY Machines
Thanks for the reply's. Do they make standards or offsets for 3D printers. metal of course? ampapa,by ampapa - Mechanics
@The_Digital_Dentist, is there no need for an extending post at the top of the worm gear, will it not flex? Good stuff... ampapa,by ampapa - CoreXY Machines
I don't know what to call them but what are people using for spacing their steppers and pulleys on corexy designs so that the belts are on different paths? Aluminum tubing cut to size? ampapa,by ampapa - Mechanics
The images didn't post to the page.. but it looks awesome! No backlash is incredible... ampapa,by ampapa - CoreXY Machines
@bigfilsing @DC42, I get the offset settings but I'm still not sure that will solve the problem. Maybe I'm misunderstanding how the tool change works but it looks like they each have a home on the back plate held in place magnetically and on homing rods. Each tool I assume has its own heater, hot end and fan. So, essentially they are identical in configuration but when you change from one tool tby ampapa - CoreXY Machines
Good stuff!! The deign is great... I really like my original model takes out the guess work. ampapa,by ampapa - General
Couldn't you just retract the filament beyond the heater and then after a tool change just pre-feed some material? doesn't seem like a big deal to me but maybe I'm over simplifying. A tool change doesn't have to be fast it just has to be accurate. I was thinking about the tool change concept and the accuracy after a tool change, not necessarily about the mount itself but the tool tip to the beby ampapa - CoreXY Machines
That is awesome! very inspiring... ampapa,by ampapa - General
Just to close the loop on the idea.. definite quality difference on the ball bearings but no real improvement in the motion. ampapa,by ampapa - Mechanics
@the_digital_dentist how's that new design coming on the worm drive...?by ampapa - CoreXY Machines
"200 3/32" Inch G25 Precision Chromium Chrome Steel Bearing Balls AISI 52100" $6 on eBay... giving them a go. Thanks guy's.by ampapa - Mechanics
Yeah, so these are some cheapo chines rails that I thought I might drop some balls in too see if the movement improves... if not no worries. I think they missed the "careful selection of the balls"... So do they manufacture a ball to fit a rail, measuring each carriage to the rail and then adding the balls that fits? I would assume they manufacture all parts separately and assemble. I'm guessinby ampapa - Mechanics
If I were going to replace some ball bearings in linear slides where would one source those from? ampapa,by ampapa - Mechanics
Looking good @the_digital_dentist! Maybe I'll test your design instead... hmmm. @hayseed_byte, I agree with you, 8mm shafts are easy to find but slotted ones however are another story. I have some small end mills but not a 2mm. ampapa,by ampapa - CoreXY Machines
@the_digital-dentist... can't wait to see this new worm drive concept. Is this base don the garage door opener I remembered reading something about? ampapa,by ampapa - CoreXY Machines