My most recently completed small format deltabot FDM printer, a Cerberus Pup 170. This one is sold to the Materials Science Department at Arizona State University. Features include 170mm round borosilicate print surface sitting on an aluminum substrate hex heated bed designed by @Roy_Cortes . This 3D printer uses 190mm long carbon fiber magball rods, Kysan Nema 17 stepper motors with GT2 belts and 20T pulleys. This all fits inside the bottom frame alongside an Azteeg X1 controller with SD8825 32nd stepping drivers. It’s powered by the Xbox360 203W PSU. All of the aluminum parts are water jet cut from T-6061 alloy. The alloy vertical carriages roll in the t-slot of 500mm tall Misumi 1515 extrusions on my dual 623 V black acetal rollers. These provide an incredibly smooth, solid, quiet and very lightweight linear rail system. The hotend is j-hotend mounted in an aluminum hinged bracket which serves dual duty as the bed leveling probe. The Viki LCD controller is optional but as you can see, it integrates quite nicely into the design.
Beautiful. A work for art!
What a beauty !
I’m seeing the magball rods n a few designs, they seem like a neat way to handle a sticky problem (the joints on my 3DR build were an interesting challenge in clearances)…how well do they work?
Mine work great but it’s taken a number of iterations to refine the design. For this magball design the key innovation was the ball socket. I’ve designed the plastic socket so that the ball ‘pops’ into it with a bit of pressure for a nice secure fit, the magnet then draws the steel ball to the base of the pocket for zero backlash. The rod assemblies can still be removed but it’s held really well so a good tug is required. For optimal fitment the ball sockets are lightly machined with a 3/8" burr on a hand drill after the magnets have been installed. Rotated slowly until the burr lightly contacts the magnet. A small dab of lithium grease keeps everything moving smoothly and the plastic conforms to the ball quite nicely. I’m at the point where I think the design is solid enough that I’ll be providing the stl files on github and offering the machined 3/8" ball bearings and magnets for sale on my website.
oh, i placed an order a moment ago, missed the machined balls!
@Nicolas_Arias - not on the site yet. I expect to have them up before the weekend.
Hook us up
I’ve decided to build one of these Pups. I think I was able to order the last 3 Pup carrier kits this week. I hope the stock count was accurate. When will the 1/8 aluminum plates be available in your web shop?
I’m hoping to get all the parts I am making for Pup, 250 and MEGA 400 available on the website in the next few days. Just haven’t found the time to sit down and add them!