UConduit - H-bot

thingiverse

I volunteer in a local high School classroom (Mechatronics) a couple of days a week. We had six 3D printers in the classroom before the printing and building of this one. We wanted to prove to the students, our future engineers, that you can indeed build a good 3D printer for less than $200. All the rest of our classroom printers had cost $350 dollars or more. The U-conduit printer by iquizzle was a very good candidate. The construction of the printer provided a very stable printer due to the O-ring design, which also made the frame scalable in size. The H-bot style also presented another form of 3D printer style for the students to experience. Our printer size was determined by the length of the 8mm rods we had available to us. The print area is: X 229 mm, Y 229 mm, Z 203 mm (9 inch x 9 inch x 8 inch). The reason I call this REMIX is because there were several items that were changed during the construction process. Since the original designer had also provided the OpenSCAD drawings, it made it possible to modify without completely redrawing everything. After studying those drawings you can see he has done a lot of thinking during his design and engineering process. To make use of those OpenSCAD files also forced us to learn something other than the Solidworks or AutoDesk Inventor normally used in the class room. Currently using this printer in the classroom. It is used with software from Repetier Host V1.6.2, along with Arduino Mega 2560 using Marlin RC-7. 7/1/2018 Added modified files used for SAE machine screw assembly. Mostly 6-32 and 8-32 machine screws and nuts during assemble to reduce cost 7/1/2018 Also see Screwdriver Holder that mounts to the 3/4" conduit frame. https://www.thingiverse.com/thing:2955050. Print Settings Printer: Migbot i3 Rafts: No Supports: Doesn't Matter Resolution: 0.20 Infill: 30% Notes: The only changes were that the extruder was printed using supports, with a 50% infill Post-Printing Credits: U-Conduit original designer/Engineer: UConduit H-Bot 3D Printer / Reprap by iquizzle, published June 13, 2013 http://www.thingiverse.com/thing:102972 Used for belt mounting and tightening: Adjustable GT2 Belt Tensioner by stratop80, published Oct 14, 2015 http://www.thingiverse.com/thing:1071695 Used for holding Arduino and RAMPS board: Arduino Mega Bumper by Chu, published Sep 12, 2012 http://www.thingiverse.com/thing:30270 Original was modified slightly to add mounting taps with board holding clips. 12864 Display case: Case for the Full Graphic Smart LCD Controller by wersy, published May 11, 2013 http://www.thingiverse.com/thing:87250 Modified to add H-Bot name and change to small hole for resetting. Added round conduit mount to back of case. Fan Grille – thingy (could not find the original designer on Thingiverse. If you recognize your work please let me know so you get the proper credit for the 40 mm fan grill with hex pattern) Items Modified from the original design: 1). All items were changed from using metric nuts and bolts to using SAE standard machine screws. This was done due to the ease of availability, and cost savings over metric machine screws. Used mostly 6-32 & 8-32 machine screws purchased at local hardware store in bulk. 2). Pipe mounted Bowden style extruder. 3). Three point bed leveling with mirrored glass holders. 4). Added 128-64 LCD display . 5). Different style extruder hot end necessitated a complete redesign of extruder and fan mounting. New extruder is a: Metal J-Head V6 Hot End, 1.75mm Filament, Direct Feed, Extruder 0.4mm Nozzle. Will post this item as separate build http://www.thingiverse.com/thing:2199014. 6). Modified Y axis rod mounting to get the different style extruder more room and make it a little more stable. Also, saved some room to make build height slightly higher (~1 inch). 7). Mechanically adjustable Z-offset switch mount. Will Post this item as separate build. http://www.thingiverse.com/thing:2203628 8). Pipe mount on back of printer for 12 volt power supply. 9). 1/5/2018 Relocated Z motors to the bottom of the printer, and modified the Y axis rod mount (pulley end was bending from belt tightening). Will Post this item as separate build.https://www.thingiverse.com/thing:2747821