BOB

thingiverse

This is the bastard child between an Ultimaker and a Replicator 3D printer. I got fed up with belts, alignaments puleys and all that unprecise gear so I made one with ballscrews. As mentioned above it uses various parts and concepts from those 2 printers. Good, level and strong chassi made of MK profiles and the printer head configuration from the ultimaker. Instructions I have printed some of the STL files and came out great....on an Afinia printer. The bearing holder kept the press fit tolerance and all. I tried printing them on the Ultimaker and while they are usable you need to open some of the holes and smooth out some other parts but usable for sure. I will post all the hardware that needs to be bought and its size and PN. The ballscrews would need a tough bearing due to the linear forces. As far as the motor there is almost no force required to move the printer head hence the accuracy. The ballscrews are also the most expensive part but if memory servs all the parts still came under $1000 or around that mark. I will probably be using the Ultimaker controller and with the heated build platform upgrade and PS since I have them already. And considering the materials the replicator and ultimaker are made of, now I see their markup is way to high for the quality of the product. All the bashing aside, pls feel free to download the zip file which contains all the working files and assemblies used by SolidWorks and change things as you see fit. Do let me know if you make any changes so I can incorporate them and pass the on. URGENT!!!! I found a fatal flaw in the design of some fo the parts and I removed them. Hopefully no harm donw. The ballscrew carraige was imported backwards for some reason which changes EVERYTHING. FRAK! I will fix and reupload all the files once more. My appologies. Ballscrew: Misumi BSSR1405-450 Linear Bearing: Thomson RBL 608ZZ/C3/EMQ/V2 Aluminum Extrusion: MK 25mmX25mm 25Series. Stepper Motor: SY42STH47-1684B UPDATE! 15/04/13 So I found a fatal flaw in the gear used. I installed the X axis and attached a drill as a motor and went to town. I noticed the far end was jittering. It turns out that the ballscrew has some side movement, which translated in huge movement when reaching the other end. I will try and troubleshoot to see if there is a fix. But as is BOB is dead in the watter. Sorry everyone. I'll keep you posted. Cheers.