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Cartesian XYZ machines with frames made of extruded aluminum, T-Slot, Makerslide, and more. See http://reprap.org/wiki/Category:Aluminum. Previously named "Extruded Aluminum"
Re: Stratasys sues Afinia - 12 years ago
Disclaimer: This post does not constitute legal advice. I am not an attorney. I do not have expertise in these matters. There is dialog on Reddit on this topic. QuoteTimaz Data corresponding to a desired shape of a prototype is transmitted to a rapid prototyping system. The system calculates a sequence for extruding flowable material that thermally solidifies so as to create the desired geoby A2 - General
Re: Please help for getting proper firmware for this - 12 years ago
I like the worm driveby A2 - Polar Machines, SCARA, Robot Arms
Re: Grounded Experimental Delta Printer - 12 years ago
Tks! Looking forward to seeing what the RepRap community does with your design! Can RepRap software slice STEP files? To import Inventor .ipt files into SolidWorks:by A2 - Delta Machines
Re: Stratasys sues Afinia - 12 years ago
Disclaimer: This post does not constitute legal advice. I am not an attorney. I do not have expertise in these matters. I took a quick look at a few more of Stratasys patents (they have lot of patents), and I'm shocked by what they have earned. New, novel, non obvious to one skilled in the art, were not on the USPTO check list. It's as though the patent reviewer didn't look on the internetby A2 - General
Re: Stratasys sues Afinia - 12 years ago
Disclaimer: This post does not constitute legal advice. I am not an attorney. I do not have expertise in these matters. Thin-wall tube liquifier (i.e. extruder or hot end) US 6004124 Summary: Don't use a thin wall tube to guide the filament towards the heated nozzle. Claim 1. a first thin-wall tube having an inlet end for receiving a flament of a first material, an outlet end for deliby A2 - General
Re: Stratasys sues Afinia - 12 years ago
Disclaimer: This post does not constitute legal advice. I am not an attorney. I do not have expertise in these matters. Method for controlled porosity three-dimensional modeling US 5653925 Summary: Workaround: Don't sell a 3D printer with a print head. This patent pretty much locks up the market. I don't understand why Stratasys, Inc. didn't pursue the hundreds of copy cats?by A2 - General
Re: Grounded Experimental Delta Printer - 12 years ago
QuoteTheTechnicalNoob Your endstopless calibration method should work, but I think I like endstops better: more precise and less error prone, less work. Tks! I agree that utilizing quality end stops is more desirable. I'm thinking of people in tough financial situations, and people in locals that don't have easy access to all the hardware that we have available. Reducing the vitamin count is Iby A2 - Delta Machines
Re: Grounded Experimental Delta Printer - 12 years ago
@ TheTechnicalNoob Simpson cad files I believe are available? Nicholas said last week that he is working on fixing the software. I think he said that it's off by 1.5 mm at the outer limit of the print envelope?by A2 - Delta Machines
Re: Grounded Experimental Delta Printer - 12 years ago
QuoteTheTechnicalNoob But the software needs to know what position the arms are in. Thanks for pointing that out! Idea to eliminate all end stops: A centering guide is laid on top of the heat bed that has a cone shaped hole in the middle. You place the hot end nozzle into the cone, which centers the arms equally. If the nozzle profile is inadequate, or heat is an issue, you place a cone over thby A2 - Delta Machines
Re: Stratasys sues Afinia - 12 years ago
It's very unusual of Stratasys council not to have been proactive and instigated litigation at the juncture that Stratasys had some cash to sling around. Maybe the owners ignored the advice of their council? Maybe it's a clue that the owners of Stratasys are OK humans Every big company needs to have a track record of litigation to the tune of at least $3,000,000, maybe today that number shoby A2 - General
Re: Stratasys sues Afinia - 12 years ago
Disclaimer: This post does not constitute legal advice. I am not an attorney. I do not have expertise in these matters. Summary: I think claim 1c is among the main claims to focus on. I think it reads that they have the ability to reduce the heated bed temperature to a point that it cools the part “and” at the same time reduce the temperature of the part. Their use of the therm “local regiby A2 - General
Re: Worm Drive Grounded Delta Printer - 12 years ago
QuoteSolidus Labs The play in the z axis on the print head is caused by the rotation on the shoulder pivots. The play is very bad around the edges of the print bed where the arm angle is small and the horizontal pivots are close together. I added a spring to mitigate this but I think it is making movements nonlinear. I'm unsure of your use of the word “play”, I tend to think of it as the fit upby A2 - Delta Machines
Re: Reprap Host software over USB on Android - 12 years ago
@ mdietz Smoothie Board specifications, will this work? USB provides the main means of communication with the host computer. The connector is mini-USB. Composite USB Mass Storage + Serial interface to host USB2 Composite device : shows to the computer as both a Serial device, and a Mass Storage device ( exposing the SD-card ), à-la mbed.by A2 - Developers
Re: LISA Simpson - 12 years ago
Pic looks great! You could use the epoxy nut to take up the backlash of the steel nut. I'm not sure how I to go about maintaining a relationship between the two? Add graphite to the epoxy to reduce the friction. West System sells it, I've used it, and it works great. Straight epoxy would have too much friction. Ideally you want the contact surface to be mostly graphite. You could mix two batby A2 - Delta Machines
Re: Reprap Host software over USB on Android - 12 years ago
@ mdietz I loaded the free version of your GCode Simulator & Printer onto my HTC 3D phone, looks good. Will it support the new Smoothie Board? If not can you add it?by A2 - Developers
Re: Prints coming out too Large 
- 12 years ago
Calibration_Guide Steps per millimeterby A2 - General
Re: Graphics Artist for RepRap - 12 years ago
You're probably aware of this, but just in case the IRC and Magazine links are not activated. Tks for adding the links +1by A2 - General
Re: Grounded Experimental Delta Printer - 12 years ago
I'm just wondering if a few vitamins (end stops) can be eliminated with software. Bed leveling, and end stops are they really required, or can we with precision manufacturing, and software eliminate them? Assumptions: perfect equal arm lengths, a flat bed, and 120 degree arm separation: Because the arms make a 3 point contact with the table, is leveling really necessary for grounded deltas?by A2 - Delta Machines
Re: Worm Drive Grounded Delta Printer - 12 years ago
@ nicholas.seward tks for your comments. Quotenicholas.seward Simpson/GDR have a real bad singularity when the hub attachment point and the shoulder joints are coplanar. I think your example is based in the Z axis? It was explained to me that when the nozzle is centered between two arms (i.e. coplanar) there will be a singularity, is that what you mean? Quotenicholas.seward Any stepper rotationby A2 - Delta Machines
Re: Worm Drive Grounded Delta Printer - 12 years ago
@ Solidus Labs 21. Zig Zaging Up Down: Could the error be coming from the rotation at shoulder pivots? Maybe there is a singularity when the arm has to rotate quickly? I showed the math to some one, and they questioned the use of acos. They didn't explain their reasoning. Is there a singularity at the center of the build table? If there is, and it requires significant force to overcome, maybeby A2 - Delta Machines
Re: Worm Drive Grounded Delta Printer - 12 years ago
FR4 PCB Heated Bed Would this be cheaper than purchasing a silicone heating pad? I imagine that you could create a layout with a ruler and marker, then using a dremel create the heater elements. FR4 PCB Heated Bedby A2 - Delta Machines
Re: Layer Adhesion Problems with ABS-PC and Polycarbonate - 12 years ago
@ cope413 What Nylon trimmer line manufacturer are you using, and where are you sourcing it? Are you drying it?by A2 - General
Re: wire feed metal deposition anybody? - 12 years ago
The article doesn't explain the deposition technique. Varying the pressure is not new. No articles produced by this process is depicted. Feeding wire into a melt chamber is not new to metal rapid prototyping. What is novel about this? What metal are they processing? Any links to papers from this article? I'm not going to chase this one down, as it looks like they copied previous methods. But ifby A2 - General
Re: additional links in the header - 12 years ago
+1 great idea!by A2 - Administration, Announcements, Policy
Re: RepRap Bounties - 12 years ago
A forum for bounties is a good idea. Knowing when a bounty is open or closed would be very helpful. Are there any RepRap bounties right now?by A2 - General
Re: Small Injection Molding Unit - 12 years ago
@ jamesmount First link in this thread:by A2 - Plastic Extruder Working Group
Re: Worm Drive Grounded Delta Printer - 12 years ago
20. I don't know that different arm lengths will effect the Z axis position, I hope not. But I wonder if the precision of the variable calculation (single, double, float), and the ratio of the arms are not perfect maybe a small amount of "slope error" is generated in the Z axis? Just an idea to rule out things. 21. Correct, I was thinking that a larger worm wheel will impinge on the print enveby A2 - Delta Machines
Re: Worm Drive Grounded Delta Printer - 12 years ago
@ JamesNewton It would be difficult, but not impossible to manually reduce the diameter, and maintain a concentric relationship with the the thread body. I would question how ridged it would be under load.by A2 - Delta Machines
Re: Worm Drive Grounded Delta Printer - 12 years ago
Maybe this will work Process to make a round hole: Coat a metal rod with wax (mold release). Fill the star shaped hole with epoxy glue. Insert the metal rod and let the epoxy cure. Hammer out the metal rod. Step drill to size. lego worm gearby A2 - Delta Machines