That's a pretty nifty idea!by Ezrec - General
I have in my Delta start-of-print sequence a wipe with a 1mm total extrusion at Z=0.15mm around the perimeter of the bed. Then off to printing...by Ezrec - General
An industrial version of the same technique. They have a downloadable version of Cura, I believe, that renders the correct Gcode for 45 degree slicing.by Ezrec - General
Just to be clear, I’m not trying to rip off either Polar/Printrbelt nor Blackbelt. Primarily this is for my own entertainment, and to research/develop 45 degree slicing technology. My first prototype is actually going to be a standard core XY platform, with a standard reprap slide-on-Y a 45 degree angle to simulate a conveyor (for developing the software).by Ezrec - Mechanics
Thank you! That’s an excellent idea - I had gotten so hung up on the steel belt I forgot to think of simpler alternatives!by Ezrec - Mechanics
As 45 degree conveyor printers are becoming available commercially (see BlackBelt 3D and PrintrBelt), I have developed an interest in replicating the concept in my RepRap. The frame and XY mechanics (Core XY) are easy enough, and the first layer adhesion problem is solvable (nozzle camber, and making sure the first 'Z' layer is extruded thickly enough), but the tricky bit from a reprap perspectiby Ezrec - Mechanics
One more thing - the smooth rod on the Y axis is what resists the belt tension. No torque is being applied to the MDF mounts.by Ezrec - CoreXY Machines
Thanks for the comments about the belt twisting issues - I've recently acquired flanged bearings and will be untwisting the belts. The reason all the parts are 3D printed is that I don't have a ready machine shop, but I do have a delta printer - and since I had no reference design to work off of, I expect to do quite a bit of iteration. This is a "experimentation with scraps laying around my woby Ezrec - CoreXY Machines
Followup: I ended up building a single-belt version of this design, which the Google+ community named 'Core-T': Works pretty well for a 'scraps' 3D printer. Quite happy with the Core-T motion (it's a 0.8mm nozzle printer, so I can get away with a lot of slop)by Ezrec - CoreXY Machines
Yes, exactly! I'll study his design - I think I see where my belt error is...by Ezrec - CoreXY Machines
1) the end of the X axis rests on a (not drawn) Y smooth rod. It's "floating" only in that there is no solid mechanical linkage like a UU bearing. 2) yes, in retrospect, I think there may be an issue with my belt design making the movements I want. I'll need to make a mockup. 3) Thanks for the AxiDraw reference - its giving me some ideas about how to resolve some other issues.by Ezrec - CoreXY Machines
In an attempt to eliminate belt crossings, I've hit upon this variant of the CoreXY concept: Excuse my poor attempt at a drawing. Solid pink - top "A" belt. Solid black - top "B" belt Dashed lines - moving carriages The CoreXY belts are driven by co-located steppers (the circles with a "dot" in them) at the top left. The Y axis (vertical) belts are tensioned on either side of the Y axis smoby Ezrec - CoreXY Machines
I use a cardboard box with a 40watt incandescent light bulb in it. I place a cardboard divider between the light bulb and on the spool to be dried to prevent the spool from overheating (and warping) by direct radiation. I use a cooking meat thermometer to verify the temp, and I have a 12v fan inside to circulate the air. Seems to dry PLA fine (at 150F) over the course of about 8 hours.by Ezrec - Developers
.. and keep in mind, 3-color printing will never get you the full color gamut for FFM printing. For that, you would need at minimum 4 colors - Cyan, Magenta, Yellow, and White. For better black saturation, 5 color with Black would be best.by Ezrec - Reprappers
Just for the record, I'm using binder jetting, not SLS laser melting.by Ezrec - Powder Printing and Selective Laser Sintering
Obviously, metallic and grounded (both bin and sieve) will help. Same with any handling tools (scrapers, scoops, etc). A long metal necklace (unhooked) stuffed into your shoe, and a dangling on an anti-static mat that connects you and the bin will also work wonders. You don't want much humidity, especially with nylon. An incandescent light bulb (40 watt) in the lid of your bin that is always onby Ezrec - Powder Printing and Selective Laser Sintering
A 'pen driver' is different for each head, and HP (and Canon, and EPSON) don't release the signal information needed to drive them. However, the HP C6602A was an exception, since it is used in a wide variety of non-HP devices. It's only 96dpi, but sufficient for powder printing. See: Nicholas C Lewis's InkShield and a full powderbed printer based off of it: YTec 3D's Plan Bby Ezrec - Powder Printing and Selective Laser Sintering
I've actually started to look into EPSON printheads - they are better adapted for continuous ink supply. The EPSON TM-C610 label printer seems to be ideal for a 'nano' powder bed printer, and their TM-C600 'cousin' is easily available in the US. http://www.evillabs.net/wiki/index.php/EPSON_TM-C600by Ezrec - Powder Printing and Selective Laser Sintering
Having fun with alternate powder media in my Z310+ Sugar is a lot cheaper than ZP150 media! Hopefully these successful experiments will convince me to continue my work on BrundleFabby Ezrec - Look what I made!
I've recently begun sugar/meringue powder experiments on my Z310+, with good success. I'm documenting my work on my own page (as the Z310+ is a commercial non-open source product), but I believe the recipe may be useful for others who are experimenting with powder printing. This cheap recipe uses rice wine (sake - about 15% alcohol) as a binder, and sugar plus other easily available componenby Ezrec - Powder Printing and Selective Laser Sintering
I accidentally dropped a freshly dried part (ZCorp ZP150 + Sake binder) in a bucket of water, and observed the following: * Immediate loss of fine details on the part * Left the part in the bucket for approx 1 hour (had other things to do, considered it a total loss) * Upon removal of the part, noticed that it was much harder than expected * Put the part in the drying oven at 80C for 2 hours *by Ezrec - Powder Printing and Selective Laser Sintering
Also, consider mounting your motors under your pistons - that way powder won't get into the bearings.by Ezrec - Powder Printing and Selective Laser Sintering
First off, for SLS, you need to have your powder temperature in the bed at a few degrees below its fusion temperature, so that your laser power is used for fusing the powder, not for heating it up. Otherwise, you will need to either vastly increase your laser powder, or dramatically slow down your scanning speed. So a heated bed is pretty much required for SLS, unless you are trying to print poby Ezrec - Powder Printing and Selective Laser Sintering
The E3D v6 groovemount is 6mm, but the old style J-head groovemount is 5mm. I printed a new mount with a 5.9mm groovemount, and my wiggle problems are gone.by Ezrec - General
I was thinking about printing a clip-on-the-rail thing that would have a little 'cup' on it. The cup could have a razor blade mounted at the inner edge, at a 30 degree angle toward the bed, secured with silicone, giving it a little bit of flex.by Ezrec - Delta Machines
Is the 110v/220v selector switch set for 110v or 220v?by Ezrec - Reprappers
One use for irregular tower diagonals (but not irregular in parallelogram) would be for 'box delta' designs, like the D-Box Delta, as described on our forums. I'm working on a generalized calibration solution. hercek: Extraordinarily useful worksheet! Thank you so much! I was not aware of wxMaxima - it will be very useful.by Ezrec - Delta Machines
1. Thanks for the google-fu! Lots of useful information there. 2. I have a generalized idea for that issue, that I would like to run by you. If two columns of the normalized matrix have the same perturbed z derivatives, then I could collapse both columns and only calibrate one of the two variables represented by those columns (since delta-z of the perturbed variables were the same). 3. Ok, I waby Ezrec - Delta Machines
I'm a bit stymied with the solution for delta forward kinematics with irregular diagonal rod lengths. All of the papers I've found so far only have forward kinematic solutions for systems where all diagonal rods are the same. Now, normally, the answer to this question should be 'Well, fix your rods so that the _are_ all the same!', and I would agree with you. As it happens, I'm working on a prby Ezrec - Delta Machines
I know that you have developed this with 3D printing in mind, but I wonder... How possible would it be to adapt this to injection molding? If you can do an injection molded variant, I think this would be a fantastic kickstarter project.by Ezrec - Developers