Well now that I've got your attention, I hope some of you can help me out here. I've taken on a few projects involving 3D printing lately, however, most of them do not include electronics. I have a relative that is looking to have me make a "Transformers Birthday Cake" similar to the one here: More info on his blog: Although he has offered plenty, and I mean plenty of info on his build, I wby redhatman - Experimental and Hobby
Quoteepicepee This sounds really quite cool, but why the RepRap forums in particular...? I'm assuming you're asking me why I chose to ask a question about writing on walls with sharpies, to a forum filled with 3D printing enthusiasts of all types?by redhatman - General
Thanks for all of the suggestions! I forgot to include in the original post that we were going for the "we just decided to write on the wall" type of look.... Now a few days later this is what happened: - During the following weekend, friends began writing on the wall - The following Tuesday the maintenance happened to do a "check-up" on some appliances in the house - We got a nasty email from tby redhatman - General
Hello fellow RepRappers! I am a college student who just finished moving into a brand new development of college student housing. In an effort to cover the walls with various posters and pictures, the idea came up to allow friends and visitors to sign a wall in our place. Before doing this and making a HUGE and costly mistake, I would like to hear your input or experiences. The wall is just a sby redhatman - General
by redhatman - CoreXY Machines
Here's a video of it printing one of the weight box shells for the counterweight system. I decided to ramp up the speed a bit and see what happened. Also, some updated picturesby redhatman - CoreXY Machines
QuoteAndrewBCN Quotedougal1957 QuoteLarsK It is an interesting design but I am not clear why you think this will help wobble? Wobble is the lag of centricity of you screw. When it rotates it pushes your carriage from side to side. For this reason you should see that the wobble in your printed pieces is exactly with the distance of the pitch on your screw. The system you have made will only helpby redhatman - CoreXY Machines
QuoteLarsK It is an interesting design but I am not clear why you think this will help wobble? Wobble is the lag of centricity of you screw. When it rotates it pushes your carriage from side to side. For this reason you should see that the wobble in your printed pieces is exactly with the distance of the pitch on your screw. The system you have made will only help if you have the problem with yby redhatman - CoreXY Machines
Here's what I've got for an idea of the counterweight system. I placed fasteners in most places to illustrate how stuff will go together. I took off the bed components and weighed them, the assembly weighs 5 lb, 14.6 oz, (5.9125 lb). The counterweights are 1" x 3", 7 gauge (0.179") steel plates, with 3 holes cut out. The center hole is for the lifting wire to pass through (I'm using clear pictuby redhatman - CoreXY Machines
by redhatman - CoreXY Machines
Quoteasbo I'm in the process of building a CoreXY myself and I'm now thinking a counterweight might be a good idea, may have to pinch your design Haha go for it, I plan on releasing all of the .stl files and everything associated with this printer within the next week. QuoteLarsK I am curious where you plan to install that, will you change to using belts instead of screws? Or will you remove oby redhatman - CoreXY Machines
Quoteasbo It looks like some sort of counterweight to me, perhaps to offset the weight of the bed? Ding ding ding! I have modified it already since posting that picture, however the idea remains the same. Hopefully this will eliminate the z-wobble condition.by redhatman - CoreXY Machines
Here's a small preview of what I've been working on lately, any guesses as to what it's purpose is? (And yes, these are parts proposed for the printer)by redhatman - CoreXY Machines
Here's something I've noticed on the last few prints... Any opinions on the odd "thick layers appearance" ? Searching the web leads me to believe it's z-axis wobble.by redhatman - CoreXY Machines
QuoteAndrewBCN First, I congratulate you for coming up with your own original design, and both the CAD design work and the impressive assembly work on your printer. The whole venture is admirable and you really have earned everybody's respect. There are a few points that I would have done differently (e.g. I wouldn't use printed profiles, I honestly prefer them in aluminum), because I feel you haby redhatman - CoreXY Machines
One issue I had once the printer was operational, was that the CoreXY Stepper Kinematics for the XY Motors were not correct. I knew this was nothing more than some connectors flip flopped, however, there were a total of 8 combinations to try. I decided to generate a truth table of sorts vs. keeping track by hand, and manually commanding moves on the printer. This particular table was generated baby redhatman - CoreXY Machines
Some test prints (0.4mm nozzle, 0.3mm layer height, PLA)by redhatman - CoreXY Machines
by redhatman - CoreXY Machines
Remember that Diablotek 475W PSU I bought? Yeah... it didn't last more than 10 minutes of use with the hotend at 220 C and the bed at 70 C. So, I was set out to power supply shop again, here's what I settled with.by redhatman - CoreXY Machines
by redhatman - CoreXY Machines
Test fitting some brackets Printing the belt cross over piece Extending wires, I nearly all steppers, endstops, fans, and the hot end needed the have extensions wired in. Cutting some more rods at a different time, along with the 8mm smooth rodby redhatman - CoreXY Machines
Top brackets which mount on the Top Front corners X-Y Motor Buckets Cutting Rods in the winter yayyy Gluing some pieces togetherby redhatman - CoreXY Machines
Now it's time to make the ideas come to life, and overall see if this thing actually works! Z axis bearing guides: 90 Degree Corner Brackets being filled with foam and clamped together. I drilled the holes in the sides which are mated together so (1) they are hidden in the final assembly, (2) they are on a flush and symmetric mating surface for easy clamping with similar parts while curing,by redhatman - CoreXY Machines
LCD Screen - To be mounted in the front of the machine. The hole in the side is for the SD Card, hole in the back is for running the 2 LCD Cables, and wires corresponding to the switches mounted on the face. Mounting the ramps board, as well as the power supply. The bottom rods are 1/4" threaded rod, mounted to the bottom frame rails. The purpose of these rods is simply to allow a place tby redhatman - CoreXY Machines
Spool Mount. This was the most recent addition, something I waited until after the machine was running to design. As I said before, the time constraints were because I had split the cost of a prusa last year with my roommate, and I really wanted to get this running by the beginning of may. I figured even if I didn't have a spool holder when it was operational, I could make do, and just print oneby redhatman - CoreXY Machines
Plan for the dreaded belt cross over. This was one of the last necessary components for the printer that I designed. I had the idea in mind, however I wanted to take measurements and play around with the belt with some 608 bearings in hand before getting a design ready to print. Belt tensioner setup for the left and right sides. I had ordered the simple spring belt tensioners, however thisby redhatman - CoreXY Machines
It's kinda starting to look like a printer at this point!by redhatman - CoreXY Machines
Hot End Assembly. The Carriage is a two-part design, which splits at the cross section of the Hot End. Now onto the bed. I had a few ideas for how I wanted to do the bed, most followed the standard idea of using a sheet of wood/polycarbonate/aluminum, cut to shape. However, after pricing those materials, I couldn't help but think how much I would rather use the 24 end pieces I had made bby redhatman - CoreXY Machines
Top XY Assemblyby redhatman - CoreXY Machines
Now onto the design. As I said, this was done over the course of roughly 2-3 months, and the printer was still being designed (and is never really complete) while parts were being printed as assembled. A few parts went through a couple of revisions, but I more so did stuff component by component, and designed around what I had available for hardware and the current design state/availability to moby redhatman - CoreXY Machines